We have used the auxiliary-field quantum Monte Carlo (AFQMC) many-body approach on the lattice to study the equation of state for a fermionic impurity interacting with a background sea of spin-polarized fermions. The impurity, or polaron, is an interesting system in both cold atomic and nuclear phys…

[Phys. Rev. C 113, 044002] Published Thu Apr 09, 2026

We extend the active learning emulators for two-body scattering in coordinate space with error estimation, recently developed by Maldonado et al. [Phys. Rev. C 112, 024002 (2025)], to coupled-channel scattering in momentum space. Our full-order model (FOM) solver is based on the Lippmann-Schwinger i…

[Phys. Rev. C 113, 044001] Published Wed Apr 01, 2026

Recently the nucleon-nucleon interaction derived using time-ordered perturbation theory in manifestly Lorentz-invariant chiral effective field theory was shown to yield promising results for peripheral neutron-proton scattering. In this work we study low partial waves at next-to-leading order by tre…

[Phys. Rev. C 113, 034002] Published Tue Mar 24, 2026

We introduce a dilated coordinate method to address computational challenges in nuclear lattice effective field theory for weakly bound few-body systems. The approach employs adaptive mesh refinement via analytic coordinate transformations, dynamically adjusting spatial resolution to resolve short-r…

[Phys. Rev. C 113, 034001] Published Mon Mar 16, 2026

Predicting the low-energy, two-nucleon ($NN$) forces directly from quantum chromodynamics (QCD), the underlying theory of strong interactions, remains a challenge for theory. The authors present a high-statistics, technically sophisticated lattice QCD calculation of $p$-$n$ and $n$-$n$ scattering amplitudes at equal (heavy) pion and kaon masses of 714 MeV and find that deuteron and di-neutron bound states do not exist. The results help diagnose a long-standing disagreement in the literature regarding the methods used to determine the $NN$ spectra and amplitudes with such calculations. The work represents a significant step toward deriving nuclear physics from first principles.

[Phys. Rev. C 113, 024002] Published Tue Feb 17, 2026

A new variational-type method for constructing the bound-state wave function of a few-body system is proposed. Instead of minimizing the expectation value of the exact Hamiltonian, as it is done within the traditional variational approach, in the proposed method the wave function is constructed by f…

[Phys. Rev. C 113, 024003] Published Tue Feb 17, 2026

We present an approach to the quantum mechanical scattering problem in which computation of a wave function and determination of scattering parameters are separate steps. This approach is built on the $J$-matrix formalism, but in place of the usual $J$-matrix procedures we introduce a novel formula that…

[Phys. Rev. C 113, 024004] Published Tue Feb 17, 2026

We present a theoretical calculation for the $A=2,3$, and 4 nuclear contact coefficients within the generalized contact formalism, using both local and nonlocal chiral potentials. The hyperspherical harmonics method is employed to calculate the nuclear wave functions, from which we derive two-body mom…

[Phys. Rev. C 113, 024005] Published Tue Feb 17, 2026

This work presents an extensive theoretical and numerical study of charged few-nucleon systems ($pd$, $dd$, and $p$-${}^3$He bound states and scattering) in the framework of pionless effective field theory (EFT) up to next-to-leading order (NLO). The authors treat the Coulomb interaction nonperturbatively, while NLO interactions, including three-body forces and a four-body force, are treated in perturbation theory. Special attention is given to renormalization issues. Only a mild cutoff dependence is seen, consistent with the expectations of power counting in pionless EFT. The results hold significant promise for $ab$-$initio$ studies of charged-particle scattering at very low energies, with applications to reactions of astrophysical interest.

[Phys. Rev. C 113, 024001] Published Fri Feb 13, 2026

We study the connection between accidental symmetries in the nuclear interaction and spin entanglement in two-nucleon scattering. Specifically, we incorporate different levels of Wigner $\text{SU(4)}$ and Serber symmetries into leading-order potentials derived from chiral effective field theory. We conduct a…

[Phys. Rev. C 113, 014005] Published Fri Jan 30, 2026

Conformal prediction is a distribution-free and model-agnostic uncertainty-quantification method that provides finite-sample prediction intervals with guaranteed coverage. In this work, for the first time, we apply conformal prediction to generate uncertainty bands for physical observables in nuclea…

[Phys. Rev. C 113, 014004] Published Thu Jan 29, 2026

In many applications one has to deal with functions that depend on two directions. A convenient basis for function expansion is provided by bipolar harmonics that are given by an irreducible tensor product of the spherical functions with different arguments. The basis of biharmonic functions is over…

[Phys. Rev. C 113, 014003] Published Wed Jan 14, 2026

We construct the three-nucleon contact potentials in the Jacobi partial-wave basis. The potentials are built in the separable form as the products of the antisymmetrized three-nucleon states in which the nucleons are arbitrarily close to each other. We compile the three-nucleon contact potentials up…

[Phys. Rev. C 113, 014002] Published Fri Jan 09, 2026

I reexamine the perturbative renormalizability of chiral two-pion exchange in two-nucleon scattering for coupled triplets when one-pion exchange has been fully iterated at leading order. Improving on previous works, it is shown that only two counterterms are required to obtain cutoff independent res…

[Phys. Rev. C 113, 014001] Published Wed Jan 07, 2026

Nuclear effective field theory organizes the calculation of observables as a power series in terms of the ratio of soft and hard momentum scales. The rigorous implementation of this idea requires a mixture of perturbative and nonperturbative methods: On the one hand, nuclei are bound states that req…

[Phys. Rev. C 112, 064009] Published Tue Dec 30, 2025

We extend previous studies of the deuteron and triton ground-state energies to next-to-next-to-leading order $\left({\mathrm{N}}^2\mathrm{LO}\right)$ in chiral effective field theory, employing a power counting in which subleading interactions are treated perturbatively. Triton calculations are performed using the no-core shell mode…

[Phys. Rev. C 112, 064008] Published Mon Dec 22, 2025

Fine-tuning of the binding energies and widths of the quasibound states in three-body systems consisting of antikaon(s) and nucleon(s) was performed. Dynamically exact three-body Faddeev-type Alt-Grassberger-Sandhas equations with three coupled particle channels were solved for the description of th…

[Phys. Rev. C 112, 064007] Published Fri Dec 19, 2025

We consider separable toy models of the nucleon-nucleon interaction inspired by chiral effective field theory. We show that nonlocality of the long-range forces causes the need for nonlocal counter terms, or even makes the whole approach nonrenormalizable.

[Phys. Rev. C 112, 064006] Published Wed Dec 17, 2025

A low-energy calculation of ${}^9\mathrm{Be}$ photodisintegration cross section is presented within an $\alpha \alpha n$ cluster approach. The $\alpha n$ and $\alpha \alpha$ contact interactions are derived from cluster effective field theory. The two-body potentials defined in momentum space are regularized by a Gaussian cutoff. The associated lo…

[Phys. Rev. C 112, 064005] Published Tue Dec 16, 2025

We investigate renormalization of chiral nuclear forces in the coupled channel of ${}^3{S}_1-{}^3{D}_1$ of nucleon-nucleon scattering. The one-pion exchange potential is treated nonperturbatively at leading order while subleading potentials are perturbations. Very much like the uncoupled channel of ${}^3{P}_0$, the singu…

[Phys. Rev. C 112, 064004] Published Mon Dec 15, 2025

Femtoscopy of nonidentical particle pairs has been instrumental for precision measurements of both two-particle sources and the final-state interactions in high-energy elementary and heavy-ion collisions. The majority of measurements assessing the source properties are based on identical particle pa…

[Phys. Rev. C 112, 064003] Published Fri Dec 12, 2025

In effective field theory, physical quantities, in particular observables, are expressed as a power series in terms of a small expansion parameter. For nonperturbative systems, for instance, nuclear physics, this requires the nonperturbative treatment of at least part of the interaction (or the pote…

[Phys. Rev. C 112, 064002] Published Tue Dec 09, 2025

The possible bound state of the ${}_{c\overline{c}}{}^9\mathrm{Be}$, a charmonium-nucleus system, is investigated. The analysis is carried out within a three-cluster model, where its binary subsystems are represented as $c\overline{c}\text{+}\alpha$ and $\alpha +\alpha$. The hyperspherical harmonics method is employed to facilitate a convenient description of this…

[Phys. Rev. C 112, 064001] Published Tue Dec 02, 2025

This work investigates Kolmogorov-Arnold network-based (KAN) wave-function Ansätz as viable representations for quantum Monte Carlo simulations. Through systematic analysis of one-dimensional model systems, we evaluate their computational efficiency and representational power against established met…

[Phys. Rev. C 112, 054002] Published Mon Nov 24, 2025

We present the measured data of the proton analyzing power $A_y$ in polarized proton elastic scattering of an unpolarized ${}^3\mathrm{He}$ target and the ${}^3\mathrm{He}$ analyzing power $A_{0y}$ in unpolarized proton scattering of a polarized ${}^3\mathrm{He}$ target at three intermediate energies: 50, approximately 65, and 100 MeV. The experime…

[Phys. Rev. C 112, 054001] Published Mon Nov 03, 2025

In this paper, we extend the method of Kadanoff-Baym equations for open quantum systems to arbitrary kinds of systems and heat baths, either fermionic or bosonic. This includes three spacial dimensions and different potentials for the system-bath interaction or external traps. We study the quantum-m…

[Phys. Rev. C 112, 044007] Published Tue Oct 28, 2025

${}^{12}\mathrm{C}$ and ${}^{16}\mathrm{O}$ nuclei represent essential elements for life on Earth. The study of their formation plays a key role in understanding heavy element nucleosynthesis and stellar evolution. In this paper we present the study of ${}^{12}\mathrm{C}$ and ${}^{16}\mathrm{O}$ nuclei as systems composed of $\alpha$-particle clusters using a short-ran…

[Phys. Rev. C 112, 044006] Published Mon Oct 27, 2025

The effects of the deuteron breakup are estimated for the $\mathrm{\Lambda }$-deuteron momentum correlation function. Faddeev amplitudes in calculating low-energy $\mathrm{\Lambda }$-deuteron scattering can provide not only the elastic scattering part but also breakup wave functions in the incident and the rearrangement channels. Calc…

[Phys. Rev. C 112, 044005] Published Tue Oct 21, 2025

The possible bound state of the $\varphi N\text{−}\alpha$ system is explored within the framework of the three-body cluster model. The calculations are done by employing the state-of-the-art $\varphi N$ interactions obtained from the analysis of the pure elastic scattering and the coupled-channel in the $\varphi p$ correlation functions.…

[Phys. Rev. C 112, 044003] Published Fri Oct 17, 2025

Toward an improved understanding of the role of quantum information in nuclei and exotic matter, we examine the quantum magic (nonstabilizerness) in low-energy strong interaction processes. As stabilizer states can be prepared efficiently using classical computers, and include classes of entangled s…

[Phys. Rev. C 112, 044004] Published Fri Oct 17, 2025

We investigate polarization states of the outgoing neutron-proton ($np$) pair in elastic polarized neutron and proton scattering, aiming to find unambiguous evidence for entanglement of their spin states. To obtain complete information about these states, we calculate, using the high-precision nucleon…

[Phys. Rev. C 112, 044002] Published Tue Oct 14, 2025

The ${}^4$He nucleus, for historical reasons often called the $\alpha$ particle, has a large binding energy but it lacks stable excited states. Experimental data suggest a $0^{+}$ resonance about 0.4 MeV above the $p$-${}^3$H threshold with a width comparable to that energy. The authors carry out a benchmark calculation which locates a shallow bound excited state in ${}^4$He near that threshold when they switch off the Coulomb interaction. As they gradually re-introduce it, the excited state crosses the threshold and eventually becomes a resonant state. Comparisons of resonant energy and width show significant discrepancies with $R$-matrix analyses from experimental data. However, using universal concepts, the authors conclude that the existence of this state is not a consequence of a particular interaction between the constituent protons and neutrons but is due to a discrete scale invariance that constrains the spectrum of the $N$-body system, thus demonstrating a connection to the universal behavior of systems with four nucleons.

[Phys. Rev. C 112, 044001] Published Wed Oct 01, 2025

Nuclear potentials are known to exhibit a considerable degree of scheme dependence. For one- and two-pion exchange nucleon-nucleon (NN) potentials, unitary ambiguities start showing up at the level of the leading relativistic corrections to the dominant static contributions. However, for the three-p…

[Phys. Rev. C 112, 034004] Published Thu Sep 25, 2025

We make order-by-order predictions of neutron-deuteron total cross sections up to next-to-next-to-leading order in pionless effective field theory. Using Bayesian methods, we infer a posterior distribution for the breakdown scale. The result shows a mode near 100 MeV, and a combined analysis with ne…

[Phys. Rev. C 112, L031002] Published Thu Sep 25, 2025

The sound velocity in homogeneous matter has fundamental significance as it relates to the stiffness of the equation of state of compact star matter. In this work, we investigate the density evolution of the sound velocity in homogeneous neutron matter at zero temperature by using an effective field…

[Phys. Rev. C 112, L031001] Published Wed Sep 17, 2025

The interaction between deuterons ($d\text{−}d$) is pivotal for understanding the characteristics of certain light nuclei from the perspective of the deuteron cluster and achieving a precise reproduction of $d\text{−}d$ fusion cross sections. In this work, we construct a set of elastic $d\text{−}d$ interactions by fitting the…

[Phys. Rev. C 112, 034003] Published Mon Sep 15, 2025

We derive a perturbation theory (PT) for the Lorentz boost operator in the space of two-nucleon wave functions. The latter is expressed in terms of the nucleon-nucleon ($NN$) potentials, developed so far in great detail for their use in the $NN$ scattering studies. The PT is designed to take into accoun…

[Phys. Rev. C 112, 034001] Published Wed Sep 10, 2025

This paper explores momentum-space wave-packet methods to calculate sharp-energy $S$-matrix elements from a time-dependent description of collisions. Two aspects of the computational time-dependent (TD) scattering theory are examined and elucidated: (i) Extraction of the sharp-energy $S$ matrices from t…

[Phys. Rev. C 112, 034002] Published Wed Sep 10, 2025

In this paper, the ${}^{18}\mathrm{O}$ nucleus is studied by means of a three-body model consisting of an inert ${}^{16}\mathrm{O}$ core and two neutrons. For the three-body system, the Faddeev equations are solved directly in momentum space using the partial-wave decomposition. The momentum-space formulation usually requires the …

[Phys. Rev. C 112, 024004] Published Wed Aug 27, 2025

We study the ${}^6\mathrm{He}$ Borromean nucleus in coordinate representation within a three-body model with two-body potentials derived from cluster effective field theory (EFT). These potentials are originally developed in momentum space and Fourier transformed to provide nonlocal potentials in configuration sp…

[Phys. Rev. C 112, 024003] Published Tue Aug 26, 2025

We calculate the two-body triton photodisintegration cross section as a function of photon energy to next-to-next-to leading order (NNLO) in pionless effective field theory [EFT($\cancel{\pi }$)] and show good agreement with experiment. In addition we calculate the polarization asymmetry $R_C=-0.441\left(15\right)$ in cold neu…

[Phys. Rev. C 112, 024001] Published Mon Aug 04, 2025

Applications of reduced basis method emulators are increasing in low-energy nuclear physics because they enable fast and accurate sampling of high-fidelity calculations, enabling robust uncertainty quantification. In this paper, we develop, implement, and test two model-driven emulators based on the…

[Phys. Rev. C 112, 024002] Published Mon Aug 04, 2025

The nucleon-nucleon interaction is studied in chiral effective field theory on the lattice. For the first time isospin-breaking effects, charge-independence breaking as well as charge-symmetry breaking, and the two-pion exchange interaction up to next-to-next-to-next-to leading order are included on the lattice. A high-quality description of the two-nucleon phase-shift and mixing-angle parameters is achieved up to 200 MeV/$c$ relative momentum. The deuteron properties are accurately reproduced. The work provides a promising basis to apply lattice effective field theory to nuclear many-body problems.

[Phys. Rev. C 112, 014009] Published Tue Jul 29, 2025

Nuclear physics seeks to describe both bound and unbound states within a unified predictive framework. While coordinate-space quantum Monte Carlo (QMC) methods have successfully computed bound states for systems with $A\le 12$, their application to unbound states remains limited. In this work, we advance…

[Phys. Rev. C 112, 014008] Published Wed Jul 23, 2025

The Young-Koppel (YK) model describes comprehensively the interaction of slow neutrons with diatomic gases such as ${\mathrm{H}}_2$ and ${}^2\mathrm{H}_2$. This paper reports on the first experimental results of ultracold neutron (UCN) scattering over a wide temperature range vindicating the YK model for gaseous ${}^2\mathrm{H}_2$ and showing…

[Phys. Rev. C 112, 014007] Published Mon Jul 21, 2025

The operator product expansion (OPE) is applied in conjunction with Pionless effective field theory to study the short-range structure of nuclei. By matching the OPE with the selected nuclear potentials for nucleon-nucleon scattering states, we obtain the Wilson coefficients. The nucleon momentum di…

[Phys. Rev. C 112, 014005] Published Thu Jul 17, 2025

I perform a further study regarding a renormalization-group (RG) issue—which concerns a wide variety of the so-called perturbative power counting under effective field theories (EFTs)—as pointed out by Gasparyan and Epelbaum [A. M. Gasparyan and E. Epelbaum, Phys. Rev. C 107, 034001 (2023)]. I show …

[Phys. Rev. C 112, 014004] Published Mon Jul 14, 2025

To capture the dynamics of macroscopic nonrelativistic fluids consisting of very many atoms, it is typically sufficient to truncate the gradient expansion at order zero, leading to ideal fluid dynamics, or at order one, leading to the Navier-Stokes theory. For mesoscopic fluids consisting of a small…

[Phys. Rev. C 112, 014003] Published Tue Jul 08, 2025

Using an effective field-theoretical approach, we investigate the properties of weakly bound two-neutron halo nuclei (also known as Borromean nuclei) that do not support a low-energy $s$-wave core-neutron resonance. Extending the recently formulated effective field theory for weakly bound Borromean nu…

[Phys. Rev. C 112, 014001] Published Mon Jul 07, 2025

We apply a variational ansatz based on neural networks to the problem of spin-$\frac{1}{2}$ fermions in a harmonic trap interacting through a short distance potential. We showed that standard machine learning techniques lead to a quick convergence to the ground state, especially in weakly coupled cases. Higher…

[Phys. Rev. C 112, 014002] Published Mon Jul 07, 2025

The description of quantum many-body dynamics is extremely challenging on classical computers, as it can involve many degrees of freedom. However, the time evolution of quantum states is a natural application for quantum computers that are designed to efficiently perform unitary transformations. In …

[Phys. Rev. C 111, 064004] Published Wed Jun 25, 2025

A time-dependent wave-packet method is devised to compute three-particle rearrangement and breakup amplitudes over a wide range of collision energies from a single wave-packet solution of the time-dependent Faddeev equations (TDFE). The TDFE is solved in momentum space for a given initial wave packe…

[Phys. Rev. C 111, 064003] Published Mon Jun 23, 2025

Quantum mechanical invariance principles dictate the most general operator structure that can be present in the nucleon-nucleon (NN) interaction. Five independent operators appear in the on-shell NN amplitude together with five corresponding coefficient functions. The usual choice for these coeffici…

[Phys. Rev. C 111, 064002] Published Tue Jun 17, 2025

The role of radiative corrections in low-energy nuclear physics is beginning to receive more scrutiny. We examine the impact of these corrections for the deuteron charge form factor and the radiative capture process $np\to d\gamma$ through the velocity renormalization group. In both cases, we find percent-lev…

[Phys. Rev. C 111, 064001] Published Wed Jun 11, 2025

The differential cross sections for the ${}^2\mathrm{H}$(p,pp)$n$ reaction have been measured for 84 angular configurations of the outgoing protons in the range of polar angles from ${13}^{\circ }$ to ${33}^{\circ }$ with a proton beam of 108 MeV. Data have been collected in the Cyclotron Center Bronowice at the Institute of Nuclear Physi…

[Phys. Rev. C 111, 054001] Published Thu May 22, 2025

We discuss new spin observables presently accessible to measurement in the proton-deuteron ($\mathit{pd}$) system, namely polarization transfer coefficients from the doubly spin-polarized initial state to the outgoing nucleon in the elastic nucleon-deuteron ($\mathit{Nd}$) scattering and in the nucleon-induced deuteron b…

[Phys. Rev. C 111, 044003] Published Tue Apr 22, 2025

We compute the neutron-neutron relative-energy distribution of the triton following the hard knockout of the proton in pionless effective field theory (EFT). This distribution can be used to study universality as well as to obtain information on the neutron-neutron interaction. In particular, one ca…

[Phys. Rev. C 111, 044002] Published Fri Apr 18, 2025

Background: Thermal fission rates have been calculated with various methods, such as Bohr-Wheeler theory, Kramers's formula, stochastic dynamics, and the Fokker-Planck equation (FPE). How to reasonably calculate fission rates is still a challenging subject.

Purpose: The FPE provides a powerful stati…

[Phys. Rev. C 111, 044001] Published Thu Apr 17, 2025

We perform Bayesian model calibration of two-nucleon $\left(NN\right)$ low-energy constants (LECs) appearing in an $NN$ interaction based on pionless effective field theory $\left(\cancel{\pi }\mathrm{EFT}\right)$. The calibration is carried out for potentials constructed using naive dimensional analysis in $NN$ relative momenta $\left(p\right)$ up to next-to-le…

[Phys. Rev. C 111, 034005] Published Wed Mar 26, 2025

I present a new approximation of the $S$-matrix dependence on momentum $q$, formulated as a sum of a rational function and a truncated sinc series. This approach enables pointwise determination of the $S$ matrix with specified resolution, capturing essential features such as resonance behavior with high a…

[Phys. Rev. C 111, 034004] Published Fri Mar 21, 2025

The present work deals with the $e^{+}\text{−}{e}^{-}$ pair production in the ${}^2\mathrm{H}(p,e^{+}{e}^{-}){}^3\mathrm{He}$ and ${}^2\mathrm{H}(n,e^{+}{e}^{-}){}^3\mathrm{H}$ processes, in order to make evident possible effects due to the exchange of a hypothetical low-mass boson, the so-called X17. These processes are studied for energies of the incident beams in the range 18–30 …

[Phys. Rev. C 111, 034002] Published Mon Mar 17, 2025

We discuss various methods for determining the level shifts induced by short-range interactions in exotic atoms, which are formed by a hadron and a nucleus of opposite charge. The energy shifts can be related to the effective range parameters through Deser or Trueman formulas. In order to assess the…

[Phys. Rev. C 111, 034003] Published Mon Mar 17, 2025

Scattering probes the internal structure of quantum systems. We calculate the two-particle elastic scattering phase shift for a short-ranged interaction on a quantum computer. Short-ranged interactions with a large scattering length or shallow bound state describe a universality class that is of int…

[Phys. Rev. C 111, 034001] Published Fri Mar 07, 2025

In the effective field theory formalism nuclear forces are organized as a low-energy expansion. Usually the lowest order in this expansion corresponds to the nonperturbative iteration of the one-pion exchange potential and a few contact-range operators as to ensure renormalization group invariance. …

[Phys. Rev. C 111, 024003] Published Thu Feb 27, 2025

For the last 60 years researchers have struggled to unambiguously identify the first excited state in ${}^9\mathrm{B}$. Many prior experimental and theoretical results provide conflicting answers on the expected energy that this level should possess. Within these lie a trend wherein two distinct values emerge as …

[Phys. Rev. C 111, 024002] Published Tue Feb 25, 2025

The reaction rates have been calculated for the $n+p+d\to d+d\mathrm{and}n+p+n+p\to d+d$ capture reactions using the Faddeev-Yakubovskii chain-of-partition momentum-space integral equations. Using time reversal invariance, the amplitudes for the capture reactions were related to the $d+d\to n+p+d$ and $d+d\to n+p+n+p$ breakup…

[Phys. Rev. C 111, 024001] Published Wed Feb 19, 2025

The goal of this work is to treat few-body nuclear systems using the adiabatic hyperspherical representation, to test an alternative approach to treat both bound and continuum states and compare the results to other techniques often used in nuclear calculations. This method is utilized to solve the $\dots$

[Phys. Rev. C 111, 014001] Published Thu Jan 16, 2025

The short-time approximation is a method introduced to evaluate electroweak nuclear response for systems with $A\ge 12$, extending the reach of first-principle many-body quantum Monte Carlo calculations. Using realistic two- and three-body nuclear interactions and consistent one- and two-body electromagn…

[Phys. Rev. C 110, 064004] Published Mon Dec 30, 2024

We introduce a simple algorithm for projecting on $J=0$ states of a many-body system by performing a series of rotations to remove states with angular momentum projections greater than zero. Existing methods rely on unitary evolution with the two-body operator $J^2$, which when expressed in the computati…

[Phys. Rev. C 110, 064003] Published Tue Dec 24, 2024

Recently, the $n{}^3\mathrm{He}$ Collaboration reported a measurement of the parity-violating (PV) proton directional asymmetry $A_{\mathrm{PV}}=[1.55\pm 0.97\left(\mathrm{stat}\right)\pm 0.24\left(\mathrm{sys}\right)]\times {10}^{-8}$ in the capture reaction of ${}^3\mathrm{He}(\vec{n},p){}^3\mathrm{H}$ at meV incident neutron energies. The result increased the limited inventory of precisely measured and calcula…

[Phys. Rev. C 110, L061001] Published Tue Dec 24, 2024

Motivated by the recent progress in developing high-precision relativistic chiral nucleon-nucleon interactions, we study the antinucleon-nucleon interaction in a hybrid approach where the real part of the potential is constructed in the leading-order covariant chiral effective field theory, and the …

[Phys. Rev. C 110, 064002] Published Tue Dec 03, 2024

We study charged particles in three dimensions interacting via a short-range potential in addition to the Coulomb potential. When the Bohr radius and the scattering length are much larger than the potential range, low-energy physics of the system becomes independent from details of the short-range p…

[Phys. Rev. C 110, 064001] Published Mon Dec 02, 2024

The chiral nucleon-nucleon ($NN$) interaction at high cutoffs has been plagued by the presence of spurious bound states. In this work, the chiral $NN$ interaction at next-to-next-to-next-to-leading order (${\mathrm{N}}^3\mathrm{LO}$) is studied by the local projection method as the cutoff increases. The evolution of short-ran…

[Phys. Rev. C 110, 054003] Published Mon Nov 25, 2024

In this work we present the study of $p\mathrm{\Lambda }$ and $pp\mathrm{\Lambda }$ scattering processes using femtoscopic correlation functions. This observable has been recently used to access the low-energy interaction of hadrons emitted in the final state of high-energy collisions, delivering unprecedented precision information of…

[Phys. Rev. C 110, 054004] Published Mon Nov 25, 2024

An interesting connection is found between the coupled-reaction-channel (CRC) approach and the triad of Lippmann-Schwinger (LS) equations for the three-particle scattering state. It turns out that the CRC decomposition ansatz can be used as a vehicle to couple the three uncoupled LS equations. The p…

[Phys. Rev. C 110, 054002] Published Thu Nov 07, 2024

We discuss renormalization of chiral nuclear forces in the ${}^{3}P_0$ channel of $NN$ scattering at next-to-next-to leading order (${\mathrm{N}}^2\mathrm{LO}$) if the one-pion exchange is treated nonperturbatively at leading order. The matrix elements of the subleading contact potentials become nearly dependent for the so-called e…

[Phys. Rev. C 110, 054001] Published Tue Nov 05, 2024

We study the leading radiative correction to proton-proton fusion using the pionless effective field theory framework at leading order. We derive the relevant matrix elements and evaluate them using the method of regions. We benchmark the accuracy of our approximations by carrying out numerical comp…

[Phys. Rev. C 110, L041001] Published Mon Oct 21, 2024

Faddeev calculations of low-energy $\mathrm{\Lambda }$-deuteron elastic scattering are performed up to $E_{cm}=20$ MeV crossing the deuteron threshold. The phase shifts of the $s$ wave with $J=1/2$ and $J=3/2$ are calculated using strangeness $S=-1$ hyperon-nucleon interactions in chiral effective field theory NLO13 and NLO19 par…

[Phys. Rev. C 110, 044005] Published Fri Oct 18, 2024

We test the BUQEYE model of correlated effective field theory (EFT) truncation errors on Reinert, Krebs, and Epelbaum's semilocal momentum-space implementation of the chiral EFT ($\chi \mathrm{EFT}$) expansion of the nucleon-nucleon (NN) potential. This Bayesian model hypothesizes that dimensionless coefficient fu…

[Phys. Rev. C 110, 044002] Published Wed Oct 16, 2024

Low-energy nuclear interactions have been extensively studied in the framework of chiral effective field theory. The corresponding potentials have been worked out using dimensional regularization to evaluate ultraviolet divergent loop integrals. An additional cutoff is then introduced in the nuclear…

[Phys. Rev. C 110, 044003] Published Wed Oct 16, 2024

Low-energy nuclear structure and reactions can be described in a systematically improvable way using the framework of chiral effective field theory. This requires solving the quantum mechanical many-body problem with regularized nuclear forces and current operators, derived from the most general eff…

[Phys. Rev. C 110, 044004] Published Wed Oct 16, 2024

Historically, studied in the context of heavy-ion collisions, the extent to which free nucleon-nucleon cross sections are modified in-medium remains undetermined by these data sets. Therefore, we investigate the impact of $NN$ in-medium modifications on neutrino-nucleus cross section predictions using…

[Phys. Rev. C 110, 044001] Published Thu Oct 10, 2024

The nature of dark matter is one of the outstanding problems in particle physics and cosmology. To assist in the search for dark matter (DM), the authors examine the most general interactions between weakly interacting massive particles (WIMPs), assumed to be spin-1/2 fermions, and isotopes of the lightest nuclei, hydrogen and helium, using chiral effective field theory for a wide range of masses and coupling constants. The authors conclude that the scalar nuclear response functions are much greater than the others and severely constrained by the existing limits provided by experiments. The present study could be extended to other possible types of DM interactions, lighter DM candidates or heavier nuclei, such as lithium, argon, and xenon, currently widely used in dark matter detectors.

[Phys. Rev. C 110, 034002] Published Fri Sep 06, 2024

Background: Emission of bremsstrahlung photons in the scattering of protons off deuterons is investigated on the microscopic cluster basis in a wide region of beam energy from low energies up to 1.5 GeV.

Purpose: Our aim is to construct a model extracting new information about the structure of the d…

[Phys. Rev. C 110, 034001] Published Wed Sep 04, 2024

We propose a simplified approach to incorporate the long-range proton-proton ($pp$) Coulomb force in three-nucleon (3N) scattering calculations, based on the exact formulation presented by Witała, Skibiński, Golak, and Glöckle [Eur. Phys. J. A 41, 369 (2009) and Eur. Phys. J. A 41, 385 (2009)]. It per…

[Phys. Rev. C 110, 024005] Published Fri Aug 30, 2024

The Gamow-Teller and Fermi matrix elements, $\langle \mathbf{GT}\rangle$ and $\langle \mathbf{F}\rangle$, respectively, for tritium $\beta$ decay are calculated to next-to-leading order (NLO) in pionless effective field theory in the absence of Coulomb interactions and isospin violation giving the leading order predictions ${\langle \mathbf{GT}\rangle }_0=0.9807$ and ${\langle \mathbf{F}\rangle }_0=1$. Usin…

[Phys. Rev. C 110, L021001] Published Tue Aug 27, 2024

Proton-deuteron elastic scattering is considered in the framework of momentum-space Faddeev equations with the screening method for the Coulomb interaction. It is shown how the interplay of the proton-proton Coulomb potential and the deuteron pole in the neutron-proton transition operator leads to c…

[Phys. Rev. C 110, 024004] Published Fri Aug 23, 2024

In this work we introduce a worldline-based fermion Monte Carlo algorithm for studying few body quantum mechanics of self-interacting fermions in the Hamiltonian lattice formulation. Our motivation to construct the method comes from our interest in studying renormalization of chiral nuclear effectiv…

[Phys. Rev. C 110, 024002] Published Wed Aug 14, 2024

We calculate neutron-neutron relative-energy distributions of $s$-wave two-neutron ($2n$) halo nuclei using halo effective field theory (halo EFT) at leading order. At this order these systems are described by the $2n$ separation energy, the neutron-core ($nc$) virtual-state energy, and the neutron-neutron …

[Phys. Rev. C 110, 024003] Published Wed Aug 14, 2024

A simple analytic expression of the three-body wave function describing the system $\left(\alpha \alpha n\right)$ in the ground state ${\frac{3}{2}}^{-}$ of ${}^9\mathrm{Be}$ is obtained. In doing this, it is assumed that the $\alpha$ particles interact with each other via the $S$-wave Ali-Bodmer potential including the Coulomb term, and the neutron-$\alpha$ forces act…

[Phys. Rev. C 110, 024001] Published Mon Aug 05, 2024

The SS-HORSE–NCSM method is generalized to the case of democratic decay into an odd number of fragments. This method is applied to the search for resonances in three-neutron system (trineutron) using ab initio no-core shell model calculations with realistic nucleon-nucleon ($NN$) potentials. The $3/2^{-}$ …

[Phys. Rev. C 110, 014004] Published Tue Jul 23, 2024

We discuss two approaches which, by applying the screening method, permit one to include the long range proton-proton ($pp$) Coulomb force in proton-deuteron ($pd$) momentum-space scattering calculations. In the first one, based on the Alt-Grassberger-Sandhas (AGS) equation, presented in Phys. Rev. C 71…

[Phys. Rev. C 110, 014003] Published Mon Jul 22, 2024

We conducted measurements of $K^{-}+{}^3\mathrm{He}\to \pi YN+N^{\prime }$ reactions using a $1\mathrm{GeV}/c{K}^{-}$-beam, with the objective of understanding the broad decay width of $\overline{K}NN$ (approximately twice as broad as that of $\mathrm{\Lambda }\left(1405\right)$ considered to be the $\overline{K}N$ quasibound state). We successfully reproduced distributions of the $\pi YN$ invariant mas…

[Phys. Rev. C 110, 014002] Published Fri Jul 12, 2024

We examine the $\mathrm{\Lambda }-{}^4\mathrm{He}$ ($\alpha$) momentum correlation in high-energy collisions to elucidate the interaction between Lambdas ($\mathrm{\Lambda }$) and nucleons ($N$). We compare phenomenological $\mathrm{\Lambda }\alpha$ potentials with different strengths at short range. In addition to the conventional Gaussian-type potentials, we construct the $\mathrm{\Lambda }\alpha$ …

[Phys. Rev. C 110, 014001] Published Mon Jul 01, 2024

A chiral effective field theory (EFT) description of the nuclear interaction contains a power counting to organize the order-by-order contributions of the strong-interaction dynamics to nuclear observables. The truncation of the EFT expansion at finite order induces errors in predicted nucleon-nucleon scattering observables. These errors are correlated across scattering energies and angles, which robust uncertainty quantification needs to account for. This work reports a Bayesian analysis for neutron-proton scattering in a so-called $\mathrm{\Delta }$-full version of chiral EFT. The authors employ Gaussian processes to learn about the correlation structure of the truncation errors and find that the effective number of neutron-proton scattering data is reduced by approximately a factor of 4 due to the correlation structure of the EFT truncation error (shown in the figure for differential cross sections). The results are important for analyzing the predictive capabilities in $ab$-$initio$ nuclear theory.

[Phys. Rev. C 109, 064003] Published Tue Jun 18, 2024

An accurate way to incorporate long-range Coulomb interaction alongside short-range nuclear interaction has been a challenge for theoretical physicists. In this paper, we propose a methodology based on the reference potential approach for constructing inverse potentials for charged particle scatteri…

[Phys. Rev. C 109, 064004] Published Tue Jun 18, 2024

We calculate two-body scattering phase shifts on a quantum computer using a leading order short-range effective field theory Hamiltonian. The algorithm combines the variational quantum eigensolver and the quantum subspace expansion. As an example, we consider scattering in the deuteron ${}^3{S}_1$ partial w…

[Phys. Rev. C 109, L061001] Published Tue Jun 18, 2024

A lepton-neutron potential in configuration space is obtained. It is based on the Coulomb plus hyperfine interaction Hamiltonian integrated over the neutron charge and magnetic densities. Different parametrizations of the neutron electromagnetic form factors are compared. It is given in the operator…

[Phys. Rev. C 109, 064002] Published Thu Jun 13, 2024

We predict neutron-proton scattering cross sections and polarization observables up to next-to-next-to-next-to-leading order in a renormalization-group invariant description of the strong nucleon-nucleon interaction. Low-energy constants are calibrated to phase shifts, subleading corrections are com…

[Phys. Rev. C 109, 064001] Published Mon Jun 03, 2024

A separable expansion of the two-particle free resolvent in terms of two-particle pseudostates is used to convert Alt-Grassberger-Sandhas (AGS) integral equations into a set of effective two-body equations in spectator degrees of freedom. The resulting effective two-body equations are much like the …

[Phys. Rev. C 109, 054004] Published Thu May 30, 2024