The perspective, published in Nuclear Science and Techniques, arrives at a moment when nuclear physics is simultaneously confronting conceptual dead ends and unprecedented technical opportunity. Facilities capable of producing rare isotopes far from stability, detectors of extraordinary sensitivity, and computational tools including artificial intelligence have expanded what experiments can ask. At the same time, the field’s traditional divisions—nuclear structure here, reaction dynamics there, astrophysics elsewhere, applications somewhere else entirely—can obscure how progress in one area depends on advances in another. Ma’s framework is deliberately organizational as much as scientific: it proposes that theory, instrumentation, computation, and infrastructure should be treated as co-designed components of one evolving ecosystem rather than parallel enterprises that occasionally intersect.

The ten questions begin with the most fundamental layer of physical reality. The first asks how quantum chromodynamics, the theory of the strong interaction, generates most of the mass of visible matter. This is not a rhetorical flourish. The Higgs mechanism accounts for only a small fraction of the mass of a proton or neutron; the rest emerges from the dynamics of quarks and gluons confined within them, a phenomenon that remains only partially understood despite decades of theoretical and experimental effort. Lattice calculations and effective field theory have made real progress, but connecting the behavior of quantum fields at femtometer scales to the bulk properties of nuclei that chemists and engineers actually use remains an unfinished bridge.

Subsequent questions probe how nuclear matter behaves under extreme temperature and density, conditions last widespread in the first moments of the universe and still produced in heavy-ion collisions and neutron star mergers. Others ask how shell structure, nuclear clustering, deformation, and the stability of superheavy elements emerge from interacting nucleons, and what new phenomena appear near the very limits of nuclear existence, where isotopes survive for fractions of a second before decaying. A further question turns outward to the cosmos: how do nuclear reactions in stars and stellar explosions forge the elements from which planets and people are made? These are not merely academic puzzles. The answers determine the nuclear data that reactor designers need, the decay properties that astrophysicists fold into models of supernovae, and the fundamental constants that precision metrologists exploit.

From this fundamental core, the roadmap extends deliberately toward application. Ma’s framework addresses fission and fusion energy, both of which depend critically on nuclear data, the behavior of materials under intense irradiation, plasma and reactor modeling, safety systems, and digital control technologies. It addresses nuclear medicine and precision measurement, where radioisotopes and radiopharmaceuticals connect nuclear structure research directly to health care, and where nuclear clocks promise timekeeping so accurate that they can probe whether fundamental constants drift over time. It addresses radioactive-waste stewardship, arguing that fuel cycles and disposal require an integrated approach combining partitioning and transmutation, geological repositories, long-term monitoring, regulation, and—crucially—public trust. In each case, the article emphasizes, practical needs feed new questions back into fundamental research, closing a loop that keeps application and discovery mutually reinforcing rather than adversarial.

What distinguishes the perspective from a conventional review is its insistence on precision as a property of the entire scientific workflow rather than of individual instruments. Reducing uncertainties in nuclear data, Ma argues, will require coordinated design across accelerators, detectors, data acquisition systems, theory, and analysis pipelines. A detector can only be as trustworthy as the calibration standards and theoretical corrections that surround it; a simulation is only as reliable as the underlying nuclear data and the quantified uncertainties attached to them. This systems-level view of precision has practical consequences: it suggests that investment decisions about facilities should be evaluated not only by beam intensity or detector resolution in isolation, but by their contribution to end-to-end accuracy in the quantities that downstream users—energy engineers, physicians, astrophysicists—actually depend upon.

Artificial intelligence occupies a prominent and carefully hedged place in the roadmap. Ma anticipates that AI-assisted methods will become standard tools for experiment control, simulation, emulation, and data interpretation across nuclear science, accelerating tasks that previously required exhaustive manual computation or beam time. But the article is explicit that such methods must remain constrained by physical laws and accompanied by transparent uncertainty quantification, particularly when predictions extend beyond the domain of existing data. In a field where regulatory decisions, reactor safety cases, and medical dosimetry can hinge on nuclear data values, an unconstrained neural network extrapolation is not merely imprecise but potentially dangerous. The message is that machine learning should augment, not replace, the physically grounded models and error budgets that give nuclear science its epistemic authority.

The perspective also translates its broad questions into concrete facility capabilities and research deliverables. It highlights the roles of rare-isotope accelerators that recreate short-lived nuclei relevant to stellar nucleosynthesis, storage rings that allow precision mass measurements of exotic species, underground laboratories shielded from cosmic backgrounds, photon and neutron sources that probe nuclear structure, isotope production platforms that supply medicine and industry, and dedicated energy-research facilities for fission and fusion. Each of these infrastructures, in Ma’s framing, is not a standalone project but a node in the network that the ten questions define. The mapping from question to capability gives funding agencies and laboratory directors a coherent logic for prioritization: facilities earn their place by how well they advance the frontier questions, and the questions in turn evolve as facilities reveal new phenomena.

Equally central is the global character of the enterprise. Large nuclear experiments, benchmark datasets, safety standards, and long-term infrastructure planning all benefit from international cooperation, and the article argues that no single country can sustain leadership across the full breadth of the field alone. At the same time, it acknowledges a complementary obligation: each nation must maintain the domestic expertise and reliable capabilities needed to participate meaningfully in international collaborations. This dual requirement—openness abroad, competence at home—reflects hard lessons from recent decades, in which supply chains for medical isotopes, specialized materials, and detector components have proven vulnerable to disruption. Governance, in this roadmap, is not an afterthought appended to science but a long-term condition for the field’s sustainability, encompassing workforce development, regulatory frameworks, and the public legitimacy on which nuclear technologies ultimately depend.

Looking toward the next decade, the perspective anticipates ever-closer integration among nuclear structure, reaction theory, continuum dynamics, astrophysics, data science, and engineering. Its central proposal is that major facilities, theoretical methods, precision measurements, strategic applications, and governance structures should be planned as mutually reinforcing components of a single ecosystem. As Ma writes, the ten frontier questions do not merely describe where the field is going; they help define what it means for nuclear science to progress in a coherent and sustainable way. Whether the community adopts this integrated framing will shape not only the pace of discovery about the origin of mass and the making of elements, but also the reliability of the reactors, medicines, and measurement standards that quietly anchor modern technological civilization.

Subject of Research: An integrated roadmap of ten frontier questions for the future of nuclear science and technology

Article Title: Ten questions, one roadmap: Reframing the future of nuclear science and technology

Article References: Ten questions, one roadmap: Reframing the future of nuclear science and technology. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: nuclear physics, quantum chromodynamics, nuclear structure, rare isotopes, nucleosynthesis, fission, fusion, nuclear medicine, radioactive waste, artificial intelligence, scientific facilities, international cooperation

The study, published in The European Physical Journal C by Teng Ji and Ulf-G. Meißner of the University of Bonn and Forschungszentrum Jülich, tackles the near-threshold structures that experiments at BESIII in Beijing, BaBar at SLAC, and CMD-3 and SND in Novosibirsk have observed in electron-positron annihilation. These anomalies appear not only in the direct production of proton-antiproton and neutron-antineutron pairs, but also, remarkably, in final states containing no baryons whatsoever: three charged pion pairs, two charged pion pairs plus a neutral pion, an omega meson accompanied by pions, and even kaon-pion combinations. The fact that the same threshold energy shows up in so many different channels is precisely what makes the puzzle so tantalizing, and so resistant to explanations based on a single new particle.

The key insight behind the new work is that when a proton-antiproton pair is produced in the aftermath of an annihilation, the pair does not simply fly apart. The proton and antiproton interact strongly with each other before separating, a phenomenon known as final-state interaction. This interaction is not a weak correction; it is powerful enough to reshape the entire line shape of the production cross section near threshold. Crucially, quantum mechanics dictates that these threshold effects must also leak into other reaction channels, a consequence of the fundamental requirements of unitarity and analyticity that govern all scattering amplitudes. In other words, the opening of the proton-antiproton and neutron-antineutron channels leaves fingerprints everywhere, including in final states made purely of mesons.

To make this idea quantitative, the authors relied on chiral effective field theory, the modern framework that derives nuclear forces from the approximate symmetries of quantum chromodynamics. Chiral effective field theory has been spectacularly successful in describing the ordinary interaction between two nucleons, and it has been extended to the nucleon-antinucleon system, where it must additionally handle the violent annihilation of the pair into mesons. Ji and Meißner used the highest-order available description, complete to next-to-next-to-next-to-leading order, with its parameters fixed entirely by low-energy nucleon-antinucleon scattering data. That fixed interaction was never adjusted to fit the annihilation data, which makes the subsequent agreement all the more meaningful.

The calculation proceeds in three carefully separated steps. First, the strong nucleon-antinucleon interaction is taken as given from the chiral effective field theory description of the coupled spin-triplet S-wave and D-wave system, solved through the coupled-channel Lippmann-Schwinger equation. Second, with this interaction frozen, the electromagnetic production amplitudes for proton-antiproton and neutron-antineutron pairs are determined by fitting only a handful of short-distance source coefficients to the measured cross sections. These sources are assumed to vary slowly with energy, so that all the sharp structure near threshold must come from the final-state interaction itself. Third, the same nucleon-antinucleon amplitudes are used as input for five inelastic mesonic channels, each described by a slowly varying polynomial background plus the universal rescattering response.

The results are striking. For the baryonic channels, the fit achieves a chi-squared per degree of freedom of essentially one, meaning the theory reproduces the data at the level of the experimental uncertainties, using just seven real parameters across fifty-four data points spanning the region from threshold up to two gigaelectronvolts. No additional narrow resonance is needed to explain the rapid rise of the cross sections just above the proton-antiproton and neutron-antineutron thresholds. The framework also incorporates the subtle isospin-breaking effects that matter at this precision, including the small mass difference between the proton and neutron and the Coulomb attraction between the proton and antiproton, treated through the Vincent-Phatak matching method that separates short-range and long-range physics cleanly.

Underlying the line shapes are near-threshold poles of the scattering amplitude, the mathematical signatures that would correspond to physical particles if they sat close enough to the real-energy axis. The chiral interaction generates one such pole in each isospin channel: an isospin-one pole near 2122 megaelectronvolts with a small imaginary part, and an isospin-zero pole near 1840 megaelectronvolts with a larger imaginary part reflecting the strong annihilation into mesons. Because annihilation makes the interaction absorptive, these poles acquire finite widths and sit on different Riemann sheets of the complex energy plane. Their proximity to the physical thresholds is what sculpts the observed enhancements, providing a dynamical origin for structures that might otherwise be misread as evidence for new particles.

The real test comes with the non-baryonic channels, where the same nucleon-antinucleon dynamics is used without modification. The authors allowed each mesonic channel its own slowly varying polynomial background and a small set of complex transition parameters connecting the intermediate baryon-antibaryon state to the final mesons, with the allowed isospin components fixed by the quantum numbers of each final state. A simultaneous fit to all five channels yields a chi-squared per degree of freedom of 1.7, reproducing the main near-threshold features of the data. The message is that the threshold structures in these mesonic channels can be understood as echoes of the same baryon-antibaryon final-state interaction, transmitted through off-shell nucleon-antinucleon amplitudes, rather than as independent resonances requiring separate explanations in each channel.

The implications reach well beyond electron-positron physics. Similar threshold enhancements have been reported in the invariant-mass spectra of proton-antiproton pairs produced in the radiative decays of the J/psi meson and in B-meson decays at Belle and LHCb, and the timelike electromagnetic form factors of the proton and neutron show dramatic rises near the same thresholds. If the unified picture holds, many of these anomalies may share a common dynamical origin, and the widespread habit of labeling every threshold bump as a new particle, from the X(1835) onward, may need systematic re-examination. The authors caution that a naive Breit-Wigner resonance interpretation can be actively misleading in the near-threshold region when the underlying rescattering dynamics is ignored.

The analysis is not without caveats. The chiral effective field theory description is restricted to low energies, so the fits stop at two gigaelectronvolts, and explicit excited vector mesons such as a possible rho state near 2.04 gigaelectronvolts are not included in the framework. The finest experimental points from CMD-3 immediately at the proton-antiproton threshold involve experiment-specific corrections for initial-state radiation and beam-energy spread that the Born-level theory curves do not attempt to replicate point by point. Yet the authors verified that their conclusions are stable under the estimated truncation uncertainties of the chiral expansion: repeating the analysis with lower-order interactions and refitting the short-distance parameters leaves the line shapes essentially unchanged. The next step will be for experimentalists to test the framework’s predictions with precision data, and for theorists to extend the same unified logic to the threshold structures seen in heavy-quark systems. If the pattern holds, physics may have gained something rare and valuable: a case where a flock of apparent new particles dissolves into the familiar, if ferociously complicated, dance of nucleons and antinucleons.

Subject of Research: Near-threshold nucleon-antinucleon final-state interactions in electron-positron annihilation

Article Title: Understanding the near-threshold structures in (e^+e^-) annihilation from a unified (N\bar{N})-interaction perspective

Article References: Understanding the near-threshold structures in (e^+e^-) annihilation from a unified (N\bar{N})-interaction perspective. (n.d.). https://doi.org/10.1140/epjc/s10052-026-16364-x

Image Credits: AI Generated

DOI: 10.1140/epjc/s10052-026-16364-x

Keywords: particle physics, nuclear physics, electron-positron annihilation, nucleon-antinucleon interaction, chiral effective field theory, near-threshold structures, final-state interaction, proton-antiproton, BESIII, CMD-3, hadron spectroscopy, scattering poles

Double-beta decay is a process in which an atomic nucleus converts two neutrons into two protons at once, emitting two electrons and two electron antineutrinos. It is extraordinarily rare, with half-lives that can exceed 10^19 years, yet it has become one of the most actively pursued topics in modern physics. The reason is that its hypothetical sibling, neutrinoless double-beta decay, in which no antineutrinos appear at all, would violate the rules of the Standard Model and prove that neutrinos are their own antiparticles—a discovery with profound implications for why the universe contains matter at all. The ordinary two-neutrino mode, which has been observed in several isotopes, serves as the indispensable benchmark: experiments measure its half-lives and electron spectra with ever-greater precision, and theorists must match those measurements with equally precise calculations to validate the nuclear structure models that underpin the search for the neutrinoless mode.

The problem, as the Romanian team points out, lies in a computational shortcut inherited from an era when the full calculation was simply impossible. The decay rate is, in principle, a single quantity that entangles the quantum structure of the decaying nucleus with the energies and momenta of the four emitted leptons. To make the mathematics tractable, theorists historically factorized it into a nuclear matrix element—a number encoding how easily the nucleus transitions through its intermediate states—multiplied by a phase-space factor describing the lepton kinematics. This factorization rests on approximations known as closure, non-closure, and Taylor expansion methods. In the closure approximation, the energies of the intermediate nuclear states are replaced by a single average energy, and the lepton energies are approximated as half of the total energy released by the decay.

That shortcut carries real risks. Because the emitted leptons carry only a few mega-electronvolts of energy, the decay rate is acutely sensitive to the exact positions of the lowest-lying intermediate states, particularly the first excited 1+ state of the intermediate nucleus. Replacing the true spectrum of these states with an average energy can therefore introduce significant errors into the nuclear matrix element and, by extension, into the predicted half-life. A more recent refinement, the Taylor expansion method, retained the lepton energies in the denominator of the matrix element up to the fourth order, improving the description and enabling new experimental analyses of electron spectra and the axial-vector coupling constant. But even this method keeps the nuclear and lepton degrees of freedom decoupled, is computationally intensive, and—critically—its mathematical validity becomes questionable for certain isotopes. In nuclei such as molybdenum-100 and selenium-82, where the first 1+ state of the intermediate nucleus lies at or very near the ground state, the expansion parameter approaches unity and the series may simply fail to converge in parts of the integration domain.

The new approach, which the authors call the Direct method, is conceptually disarmingly simple: it computes the decay rate exactly as the underlying theory defines it, without any approximation. For each intermediate 1+ state of the daughter nucleus, the team evaluates one integral in which the nuclear transition amplitudes and the lepton energies appear together, exactly as they do in nature, and then sums the contributions over all the intermediate states. The computational cost is higher, but with modern computing resources and summations over roughly 30 to 50 excited 1+ states, the task is entirely manageable. The result is a unified formula that preserves the full interdependence between nuclear structure and lepton kinematics—something no previous calculation of the electron spectra had achieved.

To test the method, the researchers applied it to two of the most important double-beta decay isotopes: selenium-82 and xenon-136. Both are staples of major experimental programs, including KamLAND-Zen and PandaX-4T for xenon-136, and both have precisely measured two-neutrino half-lives and spectra. The nuclear structure input was generated with the Antoine shell-model code, using the jun45 effective Hamiltonian in the jj44 model space for selenium-82 and the svd Hamiltonian in the jj55 space for xenon-136, with the summation over intermediate states truncated at 30 levels, a cutoff previously shown to be sufficient for convergence. The electron wave functions were computed with the RADIAL package using a self-consistent Dirac–Hartree–Fock–Slater treatment of the daughter atom, accounting for screening effects and the final nuclear size, while the multidimensional integrals were evaluated with the SPADES package. Notably, the team applied no quenching of the nuclear matrix elements or of the axial-vector coupling constant, and fitted no parameters to experimental data—a deliberate choice designed to isolate the differences between calculation methods rather than to chase agreement with measurements.

The results are striking. For both isotopes, the Direct method yields decay rates up to 16 percent higher than the approximate methods, corresponding to predicted half-lives that are up to 16 percent shorter. While the authors caution that a definitive interpretation requires extending the analysis to more isotopes and alternative nuclear models, the discrepancy plausibly stems from the nuclear-structure–lepton-kinematics interdependence that only the new method captures. Even more experimentally consequential are the spectral predictions. The single-electron energy spectrum—the distribution of energies of one of the two emitted electrons—shows differences of up to 20 percent between the Direct and approximate calculations for selenium-82, a deviation squarely within the reach of current experimental precision. The summed electron spectrum, by contrast, varies by less than about 10 percent between methods, and the angular correlation between the two emitted electrons by at most 5 percent. For xenon-136, where the relevant nuclear energy denominator sits roughly 680 kilo-electronvolts above the decay Q-value, the approximations perform much better and the differences shrink accordingly—exactly as the structure of the underlying formulas would predict.

This hierarchy of sensitivities is what makes the work potentially viral in its implications for the experimental community. Precision measurements of the two-neutrino electron spectrum have already been used by experiments such as KamLAND-Zen, CUPID-MO, and CUORE to constrain the quenching of nuclear matrix elements and even to probe the effective value of the axial-vector coupling constant. If the single-electron spectrum is genuinely more sensitive to the exact treatment of the nuclear-lepton coupling than previously appreciated, then existing and upcoming spectral measurements carry information that the standard analysis frameworks have been systematically missing. The authors also highlight that their framework is naturally suited to testing the Single-State Dominance and Higher-State Dominance hypotheses—competing pictures of how much each intermediate 1+ state contributes to the total decay amplitude—which remain contested in the literature and are difficult to discriminate experimentally without precisely calculated spectral shapes.

The team is already extending the framework to other isotopes and, more ambitiously, to the neutrinoless decay mode itself, where the closure approximation has traditionally been considered safe because the virtual neutrino carries momenta of order 100 mega-electronvolts, diluting the sensitivity to the intermediate-state energies. Whether the full interdependence between nuclear structure and lepton kinematics leaves detectable traces in the neutrinoless channel—where the stakes include nothing less than the nature of the neutrino and the origin of matter in the universe—remains an open and tantalizing question. For now, the message of the Direct method is clear: the approximations that made double-beta decay calculations possible for half a century are no longer necessary, and retiring them reveals measurable differences exactly where the next generation of experiments is looking.

Subject of Research: Direct calculation of two-neutrino double-beta decay rates with full nuclear-structure and lepton-kinematics coupling

Article Title: Direct calculation of the two-neutrino double-beta decay rate including the full lepton-energy dependence

Article References: Ghinescu, S. A., Neacsu, A., & Stoica, S. (2026). Direct calculation of the two-neutrino double-beta decay rate including the full lepton-energy dependence. The European Physical Journal C, 86(9), Article 1123. https://doi.org/10.1140/epjc/s10052-026-16356-x

Image Credits: AI Generated

DOI: 10.1140/epjc/s10052-026-16356-x

Keywords: double-beta decay, two-neutrino decay, nuclear matrix elements, phase-space factors, closure approximation, Taylor expansion, electron spectra, selenium-82, xenon-136, nuclear shell model, neutrinoless decay, axial-vector coupling

Established in 2000 by Intel co-founder Gordon Moore and his wife, Betty, the Gordon and Betty Moore Foundation has long been a cornerstone of scientific support, particularly in the realms of scientific discovery and environmental conservation. The Experimental Physics Investigators initiative specifically targets mid-career researchers, providing them with the resources to develop their research programs rather than focusing on single, isolated projects. This approach grants scientists the freedom to explore new ideas and adapt their research directions as new data emerges, a flexibility that is often lacking in federal grant systems. By investing in the scientists themselves, the foundation aims to foster an environment where bold, original science can thrive without the pressure of immediate, predefined outcomes.

Crider’s research focuses on some of the most neutron-rich atomic nuclei known to exist, a domain that presents significant challenges for experimental physicists. These exotic nuclei are unstable and decay rapidly, often releasing neutrons in complex patterns that are difficult to observe and measure with current technology. Understanding the decay processes of these nuclei is crucial for advancing nuclear models and improving our knowledge of how heavy elements are formed in the universe. Crider’s work seeks to unravel the intricacies of neutron emission, including the number of neutrons released and their subsequent behavior, which provides critical data for testing theoretical predictions about nuclear structure and stability.

With the support of the Moore Foundation, Crider plans to develop a new compact detector designed to track neutron interactions with unprecedented precision. This detector will address a key limitation in current experimental setups: the difficulty in distinguishing between multiple neutrons and a single neutron that interacts with the detector more than once. By resolving this ambiguity, the new technology will provide a clearer picture of neutron emission and the behavior of these unusual nuclei. The compact design of the detector also offers practical advantages, making it easier to deploy in various experimental environments and potentially allowing for the study of short-lived, rare isotopes that are difficult to produce and observe. This innovation could significantly enhance the capabilities of experimental nuclear physics, enabling researchers to gather more accurate and detailed data from their experiments.

“I’m incredibly honored to receive this award,” Crider said, reflecting on the significance of the recognition. “The ideas behind this project bring together several areas of research I’ve been working toward throughout my career, from neutron detection and nuclear decay to the development of new detector technologies. The Moore Foundation’s support gives us the freedom to bring those ideas together and try something genuinely new. If we succeed, we’ll have a new way to understand how some of the most exotic nuclei in nature decay.” Crider’s enthusiasm underscores the transformative potential of the project, which aims to bridge gaps in current knowledge and open new avenues for exploration in nuclear physics. The award not only validates his past work but also provides the resources necessary to push the field forward in meaningful ways.

Theodore Hodapp, the program director for the Experimental Physics Investigators initiative, emphasized the broader impact of the program on the landscape of experimental physics. “With nearly 100 investigators now at work, we are seeing the range of bold, original science we hoped this initiative would make possible,” Hodapp said. “From the start, our aim has been to accelerate progress at the frontier of experimental physics by giving brilliant mid-career scientists the kind of flexible, sustained support that federal grants rarely can. That freedom lets them take on risky, high-reward experiments and follow ideas when research results lead them down new pathways.” Hodapp’s comments highlight the foundation’s commitment to fostering innovation and supporting scientists who are willing to take intellectual risks. The program’s success in attracting a diverse group of researchers demonstrates its effectiveness in promoting original and impactful scientific work.

Crider’s research project is a collaborative effort involving several experts from different institutions. Ron Unz, a health physicist and project manager at Mississippi State University’s Institute for Clean Energy Technology, will assist with the detector development and instrumentation aspects of the project. Unz’s expertise in health physics and project management will be instrumental in ensuring that the detector is built to the highest standards of safety and efficiency. Additionally, Julie Butler, an assistant professor of physics at the University of Mount Union, will provide support for machine learning approaches to help the team understand detector signals. Butler’s work in machine learning will be crucial for processing the complex data generated by the new detector, allowing for more accurate and rapid analysis of neutron interactions. This interdisciplinary collaboration brings together diverse skills and perspectives, enhancing the project’s potential for success.

Benjamin Crider joined Mississippi State University’s Department of Physics and Astronomy after earning his doctorate in physics from the University of Kentucky in 2014. His academic journey began with a bachelor’s degree in physics and mathematics from the University of Richmond in 2006, followed by a master’s degree in physics from the University of Kentucky in 2009. Crider’s extensive educational background and research experience have prepared him to tackle the complex challenges associated with studying neutron-rich nuclei. His selection as a Moore Foundation Investigator is a testament to his dedication and expertise in the field, as well as his ability to contribute to the advancement of nuclear physics. The award will enable him to continue his research and further develop the innovative detector technology that could have far-reaching implications for the study of exotic nuclei.

The development of the new compact detector represents a significant step forward in experimental nuclear physics, offering a more precise and efficient way to study neutron emission. By distinguishing between multiple neutrons and single neutrons that interact multiple times, the detector will provide clearer data on the behavior of neutron-rich nuclei. This improved precision will allow researchers to test nuclear models with greater accuracy and gain a deeper understanding of how heavy elements are formed. The compact design of the detector also makes it more versatile, potentially enabling the study of rare isotopes that are difficult to produce and observe. As Crider and his team work to bring this technology to fruition, the potential for new discoveries in nuclear physics grows, promising to expand our knowledge of the fundamental forces that govern the universe.

The Moore Foundation’s support of Crider’s work exemplifies the value of flexible, long-term funding in driving scientific innovation. By providing researchers with the resources to pursue their ideas without the constraints of traditional grant structures, the foundation enables them to take on risky, high-reward experiments that could lead to breakthrough discoveries. Crider’s project, with its focus on developing a new detector technology, is a prime example of how such support can foster original and impactful science. As the field of experimental physics continues to evolve, initiatives like the Experimental Physics Investigators program will play a crucial role in advancing our understanding of the physical world and paving the way for future innovations. The success of Crider’s project could have far-reaching implications for nuclear physics and beyond, demonstrating the power of flexible funding in driving scientific progress.

Subject of Research: Development of a compact neutron detector for studying neutron-rich atomic nuclei

Article Title: Physicist Ben Crider selected for prestigious $1.35 million Moore Foundation Investigator Award

Article References: Physicist Ben Crider selected for prestigious $1.35 million Moore Foundation Investigator Award. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: nuclear physics, neutron detection, atomic nuclei, experimental physics, Moore Foundation, detector technology, isotope research, nuclear decay, Physicist, Crider, selected, prestigious

The problem the researchers set out to attack is deceptively simple to state. Quantum field theories, the mathematical frameworks underlying the Standard Model of particle physics, describe nature in terms of fermions, the matter particles such as electrons and quarks, and bosons, the force carriers such as photons and pions. While fermions map relatively naturally onto qubits, bosons are a nightmare. A bosonic field lives in an infinite-dimensional Hilbert space, meaning it can host any number of excitations at any energy. To squeeze such a field into a finite collection of qubits, one must truncate that space, keeping only a limited number of occupation levels per site. That truncation introduces errors that grow with both the energy of the excitations and the simulation time, and the qubit overhead required to keep those errors under control can balloon dramatically. For simulations of high-energy collisions or long-time dynamics, the cost becomes prohibitive even for quantum computers.

The Maryland team’s insight was to stop fighting this mismatch and instead embrace hardware that speaks both languages fluently. Their machine is a chain of ytterbium ions held in a blade-style radiofrequency trap, a platform of the kind that has been refined over two decades since the pioneering proposals of Cirac and Zoller and the Mølmer–Sørensen gate scheme. Each ion carries long-lived hyperfine states that serve as qubits, encoding the fermionic degrees of freedom of the theory. But the ions also vibrate together in collective motional modes, and these harmonic oscillators are, mathematically speaking, genuine bosonic systems. Instead of digitizing a bosonic field into qubits, the experiment lets the phonon modes themselves carry the bosonic field, with occupation numbers that can in principle extend far beyond what a modest qubit register could represent.

Operating this hybrid device requires a rich gate set that goes beyond ordinary qubit operations. The experiment implements pure qubit gates for the fermion sector, pure bosonic gates that displace and manipulate the phonon modes, and, crucially, mixed qubit–boson gates that couple the two sectors. The fermion–boson interaction is realized through a simultaneous red and blue sideband operation: laser pulses tuned to the motional sidebands of the qubit transition entangle the internal state of an ion with the displacement of a shared vibrational mode. Acting on an initial vacuum state, such an operation produces an entangled state of the form of a superposition of spin-up paired with one coherent displacement and spin-down paired with the opposite displacement. This is precisely the kind of qubit–boson entanglement that the Yukawa interaction, the model under study, demands.

The target of the simulation is the (1+1)-dimensional Yukawa model, a simplified cousin of the theory that describes how nucleons interact by exchanging pions, the lightest mesons in the nuclear realm. Hideki Yukawa introduced this interaction in 1935 to explain the short range of the nuclear force, and the model remains a touchstone for nuclear theorists. In one spatial dimension and one time dimension, the theory captures the essential physics of fermions coupled to a scalar boson without the full complexity of three-dimensional quantum chromodynamics. The team simulated its non-equilibrium dynamics, meaning they prepared the system in a simple initial state and watched it evolve in real time, a regime that is notoriously inaccessible to the Euclidean lattice Monte Carlo methods that dominate classical computations in nuclear physics.

The specific dynamical scenario they chose is particularly punishing for conventional quantum hardware. Starting from an empty bosonic field, the Yukawa interaction populates the field with high-occupation bosonic excitations as the fermions interact and exchange energy with it. On a qubit-only device, faithfully representing these high-occupation states would demand a large number of qubits per field site, and truncation errors would corrupt the dynamics precisely in the regime of interest. On the trapped-ion machine, the phonon mode simply absorbs the excitations natively. The experimental results effectively captured these high-bosonic-occupation states, demonstrating that the hybrid approach reaches territory that would otherwise be out of reach for a device of this modest size.

Extracting meaningful numbers from the phonon register required clever measurement techniques. To determine the probability distribution of bosonic occupation numbers in a given motional mode, the team probed the oscillator with an auxiliary qubit using a red sideband pulse. As the pulse duration varies, the probability of finding the qubit in its excited state oscillates in a way that encodes the populations of the individual Fock states of the oscillator. By fitting the measured excitation probability as a function of pulse time, the researchers reconstructed the full phonon number distribution at each simulated time step, verified against exact classical simulations of the small system sizes accessible, and supplemented with noise modeling to understand how gate imperfections shaped the observed data.

The work builds on a rapidly maturing research program at the intersection of nuclear theory and quantum information. Davoudi and collaborators had previously laid out the vision of a hybrid analog–digital approach using controlled phonon–ion dynamics for quantum field theory simulation, and the same collaboration recently simulated the phase diagram of one-dimensional quantum chromodynamics on a quantum computer. The broader field has seen parallel advances, including qudit-based simulations of lattice gauge theories, parametric excitation schemes for synthetic gauge theories in ion traps, and a growing theoretical literature on hybrid oscillator–qubit processor architectures and their instruction sets. The new experiment is among the first to run a genuine interacting fermion–boson field theory on hardware where the bosons are physical oscillators rather than encoded qubit registers.

The significance of the result lies in where it points rather than in the size of the system simulated. The Yukawa model studied here involves a small number of fermionic sites and a handful of bosonic modes, well within the reach of exact classical calculation. But the resource scaling argument is the real story: because the bosonic register is native, the qubit count grows only with the fermionic degrees of freedom, and the truncation errors that plague qubit encodings of bosonic fields simply do not arise. As the fermion sector scales up and additional phonon modes are brought into play, the simulation approaches the regime where classical methods become genuinely challenging. Trapped-ion platforms already support programmable phononic networks and coherent coupling between multiple mechanical oscillators, suggesting a plausible hardware path toward larger field-theory simulations.

There remain substantial hurdles between this demonstration and simulations of real nuclear scattering processes. Gate fidelities, phonon decoherence and heating, and the complexity of compiling long Trotterized time evolutions all impose limits, and the team’s own noise simulations show how imperfections accumulate over the course of the dynamics. Error correction for bosonic modes, an active area of research with codes designed specifically for oscillators, will eventually need to be integrated into such hybrid processors. Still, the experiment marks a conceptual milestone: a quantum computer that treats matter and force carriers on their own native terms, using qubits for fermions and phonons for bosons, has now simulated the out-of-equilibrium birth of a bosonic field. For a community aiming to compute, from first principles, the reactions that governed the early universe and still power the hearts of stars, that is a result worth celebrating.

Subject of Research: Hybrid qubit–phonon quantum simulation of Yukawa quantum field theory dynamics

Article Title: Quantum field theory dynamics on a spin–phonon quantum computer

Article References: Than, A. T., Kadam, S. V., Vikramaditya, V., Nguyen, N. H., Liu, X., Davoudi, Z., Green, A. M., & Linke, N. M. (2026). Quantum field theory dynamics on a spin–phonon quantum computer. Nature Physics. https://doi.org/10.1038/s41567-026-03402-4

Image Credits: AI Generated

DOI: 10.1038/s41567-026-03402-4

Keywords: quantum simulation, trapped ions, quantum field theory, Yukawa model, phonons, qubits, nuclear physics, bosonic fields, Nature Physics, hybrid quantum computing, non-equilibrium dynamics, University of Maryland