Nuclear Theory·nucl-th

Tuesday·May 19, 2026

21 papers—10 primary·11 cross-listed

01
[Submitted on 15 May 2026]
One- and two-nucleon transfer in $^{116}$ Sn+ $^{60}$ Ni: A coupled reaction channel analysis
Chandra Kumar · S. Nath
Recent studies of multi-nucleon transfer in heavy ion collisions have employed both macroscopic and microscopic models. Although macroscopic approaches offer useful insights, microscopic analyses of high-precision experimental data provide a more reliable framework for understanding the nucleon transfer mechanisms. The present study aims to carry out a comprehensive theoretical investigation of the $^{116}$ Sn+ $^{60}$ Ni system using microscopic coupled reaction channel (CRC) calculations. The calculations employ microscopic double-folding S $a ~$ o Paulo potentials, incorporating all relevant inelastic and transfer couplings guided by observed $γ$ -ray transitions, wherever available. For the one-nucleon transfer channels, spectroscopic amplitudes are also obtained from large-scale shell-model calculations. In the case of two-nucleon transfer, sequential, microscopic cluster and extreme cluster mechanisms are considered to reproduce the data. Results for quasielastic scattering and one-neutron ( $1 n$ ) transfer show excellent agreement with experimental data. Measured one-proton ( $1 p$ ) transfer probabilities are best described by incorporating experimental spectroscopic amplitudes in the CRC calculations. For transfer of two-nucleons, the extreme cluster mechanism is found to best reproduce the data. This study highlights that microscopic description of one- and two-nucleon transfer between two heavy ions in the CRC framework, without taking recourse to arbitrary normalization of the cross sections, is quite feasible. Nonetheless, lack of experimental corroboration for all the transitions included in the calculations and practical limits of computational resources, affecting accuracy of shell-model results and causing a cap on the number of states, leave room for further refinement of the results.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2605.16533 [pdf]
0 citations
02
[Submitted on 16 May 2026]
2N and 3N Tensor Force in the $N = 34$ Shell Evolution: An Ab Initio Perspective
Anil Kumar · Takayuki Miyagi · Noritaka Shimizu
Shell evolution plays a vital role in understanding the nuclear shell structures across the nuclear chart. In this work, we have investigated the $N = 34$ shell structure using the state-of-the-art ab-initio valence-space in-medium similarity renormalization (VS-IMSRG) approach. Notably, we employ nucleon-nucleon (NN) and three-nucleon (3N) interactions derived from chiral effective field theory and make use of the spin-tensor decomposition scheme to examine the contributions of individual interaction components. We discuss the evolution of the shell structures, which have been investigated by considering the roles of various components, including central, spin-orbit, and tensor effects of NN and 3N forces, respectively. The $N = 34$ shell gap gradually decreases from $^{54}$ Ca as the proton occupancy in the $π 0 f_{7/2}$ orbital increases, and eventually disappears in the $^{62}$ Ni as a consequence of the tensor-force driven shell evolution. Our analysis reveals that this disappearance is predominantly governed by the NN tensor force, which accounts for approximately 83 $%$ , while the 3N tensor force also contributes about 17 $%$ .
Comments:
9 pages, 5 figures. Accepted in Physics Letters B
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2605.16822 [pdf]
PLB(2026)·1 citation
03
[Submitted on 16 May 2026]
A self-consistent spectral framework for inclusive non-elastic breakup, with the Trojan Horse method as the sub-Coulomb resonant limit
Jin Lei
At the keV-scale energies of stellar nucleosynthesis, the resonant charged-particle reactions addressed by the Trojan Horse Method (THM) proceed through isolated near-threshold resonances, so the low-energy cross section and the resonance strength carry the same information, up to a normalization to reference resonances of known strength. Whether the standard THM working formula is accurate there has not been assessed in a controlled framework. I provide a self-consistent framework that computes the sub-Coulomb resonant THM extraction directly from the Ichimura-Austern-Vincent (IAV) inclusive non-elastic breakup cross section. The absorptive participant-target potential is represented by a diagonal isolated-pole spectral ansatz with three explicit validity conditions, two closing as dimensionless bounds from R-matrix tabulations and the third a model-dependent continuum-decoupling diagnostic. In the isolated-resonance limit the inclusive cross section reduces to a per-pole distorted-wave Born approximation (DWBA) cross section on the resonance state, carrying full entrance and exit distortions together with the post-form interaction and weighted by the channel branching ratio; this per-pole cross section is the controlled quantity for resonance-strength extraction. A three-layer Feshbach decomposition fixes the spectral pole half-width as half the non-elastic decay width, equal to half the total width in the sub-Coulomb limit, resolving the width, sign, and partial-width ambiguities of the literature. The standard factorized THM formula follows as a non-perturbative reduction under four explicit approximations, plane-wave entrance and exit waves, surface-localized spectator-participant interaction, on-shell binary amplitude, and post-form remnant neglect, so that its discarded content, the partial-wave coherence and the post-form remnant, is made explicit.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2605.16890 [pdf]
0 citations
04
[Submitted on 16 May 2026]
Parity violation in atoms: neutrino-mediated long range forces and finite nuclear size
Mikhail Gorchtein🇩🇪 · Hubert Spiesberger🇩🇪
We consider neutral-current parity-violating interactions in an atom mediated by the exchange of a neutrino-antineutrino pair. We explicitly account for the nuclear finite size encoded in the nuclear form factor. Based on its general properties, we derive an effective neutrino-mediated potential and determine its properties at short and long distances. We demonstrate that, once the form factor properties are correctly accounted for, the range of such an effective potential corresponds to the nuclear radius, removing any sensitivity to shorter-distance contributions. This potential changes sign over the atom's volume, so that the correction to the effective nuclear weak charge induced by this interaction is tiny and does not alter the interpretation of atomic parity violation experiments.
Comments:
5 pages, 1 figure
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Atomic Physics (physics.atom-ph)
arXiv:
2605.17059 [pdf]
1 citation
05
[Submitted on 17 May 2026]
Emergence of Cluster Formation in Light Nuclei
José Nicolás Orce · Manfred Jason Jaftha
Spherical harmonics form a complete orthonormal basis which allows any function on the sphere to be expanded. The nuclear shape of a given eigenstate can thus be described within Bohr's quasi-molecular model by a coordinate transformation from a randomly oriented ellipsoid in space to a coordinate system aligned with the ellipsoid's principal axes. This transformation (Eq. 4) is characterized by three Euler angles and two deformation parameters, $β$ (quadrupole) and $γ$ (triaxiality), but does not uniquely define the nuclear shape; rotational averaging over equivalent orientations is expected to yield a diffuse nuclear shape. Rotational invariance under $β$ and $γ$ is achieved using three transformation operators, which define a new coordinate system aligned with a single intrinsic configuration (Eq. 6). Here we show that the non-unique coordinate system of Eq. 4 with $β$ and $γ$ deformation parameters extracted from experimental electric-quadrupole matrix elements actually yields the most probable nuclear shape. Only then does cluster formation spatially emerge in light nuclei and the characteristic bowling-pin-like shapes of $^{10}$ B and $^{20}$ Ne are reproduced, consistent with modern nuclear theory. Both coordinate systems generally exhibit the same shape features for heavier deformed nuclei, where substantial triaxial deformation is empirically observed. However, the approach based on Eq. 4, using empirical $β$ and $γ$ values, provides deeper insight by capturing the superposition of multiple intrinsic configurations that collectively form the nuclear state. This, in turn, offers a physical interpretation of triaxiality.
Comments:
9 pages, 2 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2605.17277 [pdf]
0 citations
06
[Submitted on 17 May 2026]
Study of jet-induced hydro response in high-energy heavy-ion collisions with a flow-matching generative model
Kai-Yi Wu🇨🇳 · Zhong Yang🇺🇸 · Long-Gang Pang🇨🇳 · Xin-Nian Wang🇨🇳
In high-energy heavy-ion collisions, propagation of the energy deposited into the medium by energetic partons that traverse the quark-gluon plasma (QGP) leads to Mach-cone-like jet-induced medium response. Event-by-event simulations of jet-induced medium responses within a complete model such as the coupled Linear Boltzmann Transport and hydrodynamic (CoLBT-hydro) model are very resource-intensive. In this study, we develop a flow matching generative model trained by CoLBT-hydro events for the study of the medium response induced by $γ$ -jets in high-energy heavy-ion collisions. With only the initial spatial and momentum information of the $γ$ and jets, the generative model is shown to conditionally reproduce the marginal final-state hadron spectra from the jet-induced hydro response in $0 - 10%$ Pb+Pb collisions at $s_{NN}$ = 5.02~TeV. The generative model achieves a computational acceleration of approximately six orders of magnitude compared to the full CoLBT-hydro simulations, while faithfully preserving the statistical properties of the front and the diffusion wake of the Mach-cone-like hydro response and their contributions to the hadron spectra. Hadron spectra from the medium response, correlations between the front and diffusion wake and rapidity asymmetry due to the diffusion wake in $γ$ -hadron correlation are further studied within the generative model.
Comments:
16 pages in RevTeX4, 9 figures, revised version for journal submission
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2605.17511 [pdf]
1 citation
07
[Submitted on 18 May 2026]
Sequential Bayesian inference with correlated heavy-ion datasets
Lipei Du
Bayesian inference provides a natural framework for updating knowledge as new information becomes available, often in a sequential manner by incorporating datasets in stages or reusing previous posteriors as priors. In practice, this is commonly implemented using a factorized update in which datasets are treated as conditionally independent. When datasets are statistically correlated, however, this approximation becomes inconsistent with the joint likelihood and can lead to biased posterior estimates. In this work, we investigate this issue in a controlled setting using pseudo-data with a tunable covariance structure. We compare joint inference, factorized sequential updating, and a formulation based on the exact conditional likelihood. We show that factorized updates reproduce the joint posterior only in the limit of conditional independence, and otherwise lead to systematic deviations that grow with the correlation strength, while conditional updates remain consistent with the joint result. To interpret these deviations, we introduce an information decomposition that separates contributions into components that are new and components that are redundant across datasets. We show that correlations induce a structured, parameter-dependent redistribution of information, governed by the overlap of dataset sensitivities. The resulting mismatch between marginal and conditional information quantitatively explains the observed deviations. These results provide a practical diagnostic for assessing the consistency of sequential Bayesian inference with correlated datasets and highlight the need for a consistent treatment of correlations within a common probabilistic framework.
Comments:
11 pages, 7 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2605.17868 [pdf]
1 citation
08
[Submitted on 18 May 2026]
Proton-to-Alpha branching ratio in the $^{12}$ C+ $^{12}$ C fusion reaction at astrophysical energies
Ruojun Yang · Ruiqi Chen · Xiao Fang · Yihua Fan · Xiaodong Tang · Yunju Li · Fengqiao Luo
The unique resonance features in the $^{12}$ C+ $^{12}$ C fusion reaction lead to significant fluctuations in the branching ratio $R_{p / α} = σ_{p} / σ_{α}$ , making it difficult to determine the $R_{p / α}$ at astrophysical energies. By combining Hauser--Feshbach statistical-model calculations with constraints from direct charged-particle and gamma-ray measurements, we investigate the energy dependence of the averaged $R_{p / α}$ and predict its behavior within the Gamow window. Owing to the strong energy dependence of $R_{p / α}$ , the corresponding reaction-rate ratios, $⟨ σ v ⟩_{p} / ⟨ σ v ⟩_{α}$ , during core and shell carbon burning are determined to be 0.29, 0.45, and 0.52 at $T_{9} = 0.5$ , 1.0, and 1.2, respectively, significantly lower than the widely adopted CF88 constant value of 0.79. The implications of the revised $⟨ σ v ⟩_{p} / ⟨ σ v ⟩_{α}$ ratio for stellar nucleosynthesis and white-dwarf evolution are also discussed.
Subjects:
Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
arXiv:
2605.18090 [pdf]
CPC(2026)·0 citations
09
[Submitted on 18 May 2026]
Systematic study of one-point kinetic energy density functionals for atomic nuclei
Tian Shuai Shang · Jian Li · Haozhao Liang · Xinhui Wu · Cheng Ma · Wenhui Mi · Xuecheng Shao · Yanchao Wang
To explore the applicability of orbital-free density functional theory (OF-DFT) in nuclear physics, we perform a systematic benchmark of 36 one-point kinetic energy density functionals, which are originally developed for electron systems in condensed matter physics. It is found that the direct use of the original parameters for electron systems leads to inconsistent performance, with certain functionals exhibiting physically unacceptable asymptotic behaviors. However, through parameter re-optimization targeting nuclear densities, different mathematical forms of generalized gradient approximation (GGA) functionals converge to a consistent root-mean-square error of approximately 13 MeV. From a physical perspective, this consistent behavior signifies that the optimized semi-local GGAs have successfully captured the macroscopic, liquid-drop-like background of the nucleus, while the residual deviations appear as periodic oscillations at the magic numbers that could reflect the quantum shell effects.
Comments:
13 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th); cond-mat.mtrl-sci (cond-mat.mtrl-sci)
arXiv:
2605.18142 [pdf]
0 citations
10
[Submitted on 18 May 2026]
Astrophysics equation of state inference with Bayesian chiral effective field theory uncertainties
Melissa Mendes · Hannah Göttling · Anna Hensel · Isak Svensson · Kai Hebeler · Achim Schwenk · Nathan Rutherford · Anna Watts
We investigate Bayesian chiral effective field theory ( $χ$ EFT) uncertainties, which assign a statistical interpretation to equation of state (EOS) distributions near nuclear saturation density, n $_{0}$ , as well as constraints from perturbative quantum chromodynamics (pQCD) to Bayesian EOS inference from LIGO/Virgo, NICER and pulsar mass observations. The tails of the $χ$ EFT uncertainties allow for broader pressure ranges in our priors, but large parts of these are excluded by the astrophysical observations, so that the EOS and the resulting mass-radius posteriors are still very consistent with our earlier work. Within our broad prior ranges, we observe a clear stiffening of the EOS at $n ≳ 3 n_{0}$ . Moreover, the impact of the pQCD constraints on the posterior EOS and mass-radius range is negligible due to the astrophysics constraints. Exploiting the strong correlation between pure neutron matter and matter in beta equilibrium, we infer the symmetry energy slope parameter $L$ from astrophysics. For the $68%$ credible interval, we obtain $L = 42.6 - 52$ MeV and $L = 44.2 - 56.7$ MeV using piecewise-polytrope and speed-of-sound high-density extensions, respectively. The $L$ posterior is mainly driven by the combination of GW170817 LIGO/Virgo and PSR J0740+6620, PSR J0437-4715, and PSR J0614-3329 NICER observations.
Comments:
18 pages, 17 figures, 1 table. Accepted for publication at ApJ
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2605.18560 [pdf]
2 citations
11
[Submitted on 16 May 2026] (cross-list from hep-ph)
3D Initial-State Dynamics across scales: A Comparative Study of saturation and string-based descriptions
Lucas Constantin🇩🇪 · Oscar Garcia-Montero🇪🇸 · Niklas Götz🇩🇪 · Hannah Elfner🇩🇪
We compare the longitudinal deposition of various conserved quantities in the initial condition models of a string based (SMASH) and a saturation based (McDipper) approach. SMASH has been shown to work reasonably well at lower collision energies as an initial condition for the SMASH-vHLLE hybrid approach, while McDipper, based on the color-glass-condensate (CGC), works well in the regime of perturbative QCD. The two models are capable of providing longitudinally resolved initial conditions, which is essential for 3D hydrodynamical simulations. The goal of this study is to interface the different regions of applicability of the two models, to investigate the initial state dynamics in the intermediate energy regime. We analyze the deposition of transverse energy, charge and baryon number across a large range of collision energies (62.4 GeV to 5.02 TeV) and find that, while they are good agreement at lower energies, their energy and baryon deposition differs substantially at higher center of mass energies.
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2605.16914 [pdf]
1 citation
12
[Submitted on 16 May 2026] (cross-list from hep-th)
Nonlinear response of the chiral magnetic effect in the D3/D7 holographic model
Masataka Matsumoto🇯🇵 · Mirmani Mirjalali🇮🇷 · Ali Vahedi🇮🇷
We investigate the nonlinear response of the chiral magnetic current to an external magnetic field in a holographic setup. Using the D3/D7 brane system, where the chiral magnetic effect (CME) can be realized by considering rotating probe D7-branes, corresponding to introducing an axial chemical potential, we analyze the current-magnetic field relation beyond the linear regime. Focusing on the vicinity of the phase boundary between the insulating phase and the CME phase, we find that the chiral magnetic current exhibits a multi-valued dependence on the magnetic field, indicating a highly nonlinear response characteristic of this model. We further study the dynamical stability of the insulating phase near the transition point, and show that the presence of both an axial chemical potential and an external magnetic field cooperatively stabilize the system. Our results clarify the interplay between the axial chemical potential and the magnetic field in determining the phase structure and stability of the system, and reveal new nonlinear aspects of chiral transport in holographic gauge theories.
Comments:
13 pages, 5 figures
Subjects:
High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
arXiv:
2605.16931 [pdf]
0 citations
13
[Submitted on 16 May 2026] (cross-list from hep-lat)
Two-nucleon systems at $m_{π} \approx 292$ MeV from lattice QCD
Kuan Zhang🇨🇳 · Kang Yu🇨🇳 · Yiqi Geng🇨🇳 · Chuan Liu🇨🇳 · Liuming Liu🇨🇳 · Peng Sun🇨🇳 · Jia-Jun Wu🇨🇳 · Ruilin Zhu🇨🇳
Nucleon-nucleon systems in the $^{3} S_{1}$ and the $^{1} S_{0}$ channels are studied in lattice quantum chromodynamics at a pion mass of approximately $m_{π} \approx 292$ MeV, employing three $N_{f} = 2 + 1$ ensembles with the same pion mass and lattice spacing $a = 0.10530 (18)$ fm but different spatial volumes. Finite-volume energies of the nucleon-nucleon systems are determined in both the rest frame and a moving frame. The distillation quark smearing method is applied to improve the precision and to ensure the symmetric correlators by using the same interpolating operators at sink and source. The scattering amplitudes are extracted from the finite-volume spectra using the Lüscher's finite-volume method. At the studied pion mass, both the $^{3} S_{1}$ (deuteron) and $^{1} S_{0}$ (di-neutron) channels exhibit a virtual state pole, with binding energies of $6_{- 3}^{+ 5}$ MeV and $1 1_{- 5}^{+ 6}$ MeV, respectively. To investigate the effects of the left-hand cut, an alternative method -- the Non-Perturbative Hamiltonian framework (NPHF) -- is used for the scattering analysis and yields consistent results with those from the Lüscher method.
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2605.16977 [pdf]
PRD(2026)·0 citations
14
[Submitted on 16 May 2026] (cross-list from quant-ph)
Stable minimum principles for scattering states
Scott Lawrence · Yukari Yamauchi
Quantum-mechanical scattering states are energy eigenstates obeying particular boundary conditions, whose behavior at infinity encodes the S-matrix which defines the outcoming of scattering experiments. With an eye toward numerical algorithms for computing nonrelativistic S-matrices, we present a family of stable minimum principles for scattering states. States that approximately satisfy these minimum principles are shown to have a bounded difference with the true scattering states. These minimum principles and stability estimates can be used to obtain rigorous bounds on scattering amplitudes. We show that these minimum principles are applicable to momentum-dependent potentials, long-range (Coulomb) interactions, and elastic or inelastic scattering of bound states.
Comments:
34 pages
Subjects:
Quantum Physics (quant-ph); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th)
arXiv:
2605.17139 [pdf]
1 citation
15
[Submitted on 17 May 2026] (cross-list from astro-ph.HE)
Identifying observable MeV lines from the decays of weak and main $r$ -process isotopes in mergers
Maude Lariviere · Nicole Vassh · Yanwen Deng · Xilu Wang · Rebecca Surman
We consider predictions for the MeV gamma-ray spectrum emitted by the $β$ decays of freshly synthesized isotopes from a neutron star merger at timescales of relevance for post-merger (days) and remnant (years) emission. We develop a search algorithm to identify observable spectral peaks and then determine if a specific isotope has a dominant emission line producing the spectral feature. We predict emission spectra using nucleosynthesis calculations which consider nuclear models with distinct masses, $β$ -decays, and fission properties as well as variations on main ( $A > 130$ ) and weak ( $A < 130$ ) $r$ -process astrophysical conditions. We tabulate all lines from decaying isotopes that our procedure identifies and provide the predicted range in time over which each line could be visible. We find that Rh-106 presents a unique opportunity to distinguish between main and weak $r$ -process emission, as our calculated spectrum above $\sim 1$ MeV for an event dominated by the weak $r$ process is identical to the Rh-106 emission spectrum from $\sim$ 0.2 to $\sim$ 17 years. We further find emission from species such as Hf-181, Ta-182, Ta-184, and Re-188 offers the potential to be able to distinguish between nuclear models. We investigate whether the 2.6 MeV strong gamma-ray line from Tl-208 is predicted to be robustly observable across calculation variations on both timescale of days and years. We find Tl-208 to consistently shine through on the order of years, though it can face competition from Ga-72 and La-140 at early times ( $\sim$ days). We additionally highlight numerous isotopes of interest for observation and nuclear experiment.
Comments:
submitted to ApJS
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2605.17213 [pdf]
0 citations
16
[Submitted on 17 May 2026] (cross-list from hep-ph)
An Analysis on the Parton Distribution Functions of Heavy Mesons
Satyajit Puhan🇮🇳
In this work, we investigate the constituent parton distribution functions (PDFs) of the kaon and heavy pseudoscalar mesons within the light-cone quark model. Starting from the initial-scale quark and antiquark PDFs, obtained by evaluating the quark--quark correlation functions for individual mesons, we perform quantum chromodynamics (QCD) evolution to determine their partonic structure at higher energy scales. The QCD evolution is carried out using the next-to-leading-order (NLO) Dokshitzer--Gribov--Lipatov--Altarelli--Parisi (DGLAP) equations. We further compute the average longitudinal momentum fractions carried by the individual constituents at both the model and evolved scales. In addition, we predict the NLO structure functions of the kaon at energy scales relevant to the upcoming Electron--Ion Collider (EIC). For the COMPASS++/AMBER experiment, we also present detailed predictions for the NLO Drell--Yan cross sections induced by both $K^{+}$ and $K^{-}$ beams, using carbon, tungsten, and aluminum as nuclear targets. Finally, we demonstrate the dominance of the heavier constituents over the lighter constituents in heavy mesons in terms of the momentum fractions they carry.
Comments:
Accepted for Publication in PRD
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2605.17389 [pdf]
PRD(2026)·2 citations
17
[Submitted on 17 May 2026] (cross-list from astro-ph.HE)
Charged-current neutrino opacity within the relativistic Hartree-Fock framework for astrophysical simulations of core-collapse supernovae and binary neutron star mergers
Kamil Sokołowski · Anil Kumar🇵🇱 · Tobias Fischer🇵🇱
Neutrinos and their weak interactions play a vital role in the physics of core-collapse supernovae and binary neutron star mergers. Their description within astrophysical simulations, including the weak rates, is of pivotal importance not only for the prediction of accurate neutrino fluxes and spectra, including the associated conditions relevant to nucleosynthesis, neutrinos are also responsible for heating and cooling of the stellar plasma as well as the transport of lepton number and entropy. In the present article, we develop an essential improvement of the description of the underlying nuclear medium, necessary for the calculations of charged-current weak rates, with the inclusion of explicitly momentum-dependent nuclear interactions. To this end, we introduce the relativistic Hartree-Fock (RHF) approach and the associated momentum-dependent nucleon self-energies. We discuss the resulting neutrino and antineutrino opacities and find large discrepancies comparing the weak rates at the RHF level with those of commonly used relativistic mean-field (RMF) models; in particular, we observe a substantial shift of previously reported large medium-dependent modifications associated with the RMF approach.
Comments:
25 pages, 9 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2605.17563 [pdf]
2 citations
18
[Submitted on 18 May 2026] (cross-list from hep-ph)
MAGE-HEP: Monte Carlo Analysis and Graphical Environment for High-Energy Physics
Rishabh Gupta🇮🇳 · Kangkan Goswami🇮🇳 · Suraj Prasad🇮🇳 · Raghunath Sahoo🇮🇳
Monte Carlo event generators are central to high-energy physics analysis. However, workflows based on handwritten scripts can be difficult to reuse, modify, and reproduce when multiple Monte Carlo models, tune variations, run variations, and output formats are involved. We present MAGE-HEP, short for Monte Carlo Analysis and Graphical Environment for High-Energy Physics, a Graphical User Interface (GUI) driven workflow environment for reproducible Monte Carlo-based analyses in high-energy physics. MAGE-HEP organizes analysis workflows through a project-study-run hierarchy. The project stores the workspace, the study stores the reusable analysis context, and each run represents a controlled execution of that context. The MAGE-HEP Node API provides the analysis-building layer for defining generator configurations, observables, selections, output rules, and generated C++/ROOT analysis code. A study context can be inspected, reused, or exported as a \texttt{.mcx} context bundle, while the project state can be exported as a portable \texttt{.mgp} bundle. The current beta implementation validates the core idea using a PYTHIA8 and ROOT workflow. It includes background execution, manifest-based run tracking, live ROOT inspection, and particle-table summaries for supported output layouts. This paper describes the architecture, workflow, and current beta implementation of MAGE-HEP.
Comments:
11 pages, 9 captioned figures. Comments and suggestions are welcome
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2605.17871 [pdf]
0 citations
19
[Submitted on 18 May 2026] (cross-list from hep-ph)
Positivity of the effective range for finite range attractive potentials with a repulsive core
Davide Germani🇮🇹
In the phenomenological study of exotic hadrons, the sign of the effective range, $r_{0}$ , is invoked as a criterion to distinguish between compact multiquark configurations (associated with $r_{0} < 0$ ) and loosely bound hadronic molecules ( $r_{0} > 0$ ). Motivated by this, we investigate the fundamental constraints on the sign of the effective range for single-channel local interactions. We rigorously prove that for finite-range potentials, characterized by an inner repulsive core and an outer attractive tail, the effective range remains strictly positive provided that the scattering length is greater than the range of the potential ( $a > R$ ).
Comments:
8 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2605.18207 [pdf]
0 citations
20
[Submitted on 18 May 2026] (cross-list from hep-ph)
Gravitational form factors of light mesons from Basis Light-Front Quantization
Amrita Sain🇨🇳 · Sreeraj Nair🇨🇳 · Chandan Mondal🇨🇳 · Xingbo Zhao🇨🇳 · James P. Vary🇺🇸
We compute the gravitational form factors (GFFs) of the pion and kaon using their light-front wave functions within the Basis Light-Front Quantization framework. The wave functions are obtained by solving a light-front effective Hamiltonian that incorporates three-dimensional confinement along with a color-singlet Nambu--Jona-Lasinio interaction between the constituent quark and antiquark. The form factor $A (Q^{2})$ is found to be in overall agreement with recent lattice QCD and dispersive results. In contrast, $D (Q^{2})$ is enhanced in magnitude at low $Q^{2}$ relative to both lattice QCD and dispersive determinations. This behavior arises from extracting the $D$ -term using transverse components of the QCD energy--momentum tensor, which are more sensitive to the small- $x$ region and to light-front zero-mode effects in the present truncated framework. Using the resulting GFFs, we determine the mass (matter) and mechanical radii of the pion and kaon and analyze their mechanical structure through the corresponding pressure and shear-force distributions.
Comments:
11 pages, 5 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2605.18350 [pdf]
0 citations
21
[Submitted on 18 May 2026] (cross-list from hep-ph)
Quark and gluon tomography of the helium-4 nucleus
V. Martínez-Fernández🇫🇷 · B. Pire🇫🇷 · P. Sznajder🇵🇱 · J. Wagner🇵🇱
QCD collinear factorization allows coherent hard exclusive reactions to reveal the quark-gluon structure of light nuclei, enabling their 3D tomography. We study elastic form factors and deeply virtual Compton scattering on a helium-4 target, achieving theoretical precision unprecedented even in proton studies. Constraining generalized parton distributions at next-to-leading order in $α_{s}$ , incorporating kinematic twist corrections, and using full evolution equations, we provide the first tomography of a light nucleus, revealing distinct transverse spatial distributions of quarks and gluons.
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2605.18519 [pdf]
2 citations

Affiliations

first authorsco-authorsvia INSPIRE