Nuclear Theory·nucl-th

Tuesday·August 19, 2025

19 papers—11 primary·8 cross-listed

01
[Submitted on 14 Aug 2025]
About possibility to observe spin dichroism effect (the effect of tensor polarization acquiring) for the effect of tensor polarization acquiring by a nonpolarized deuteron beam passing through the nonpolarized internal target of Nuclotron
S.V. Anischenko · V.G. Baryshevsky · A.A. Gurinovich · V.P. Ladygin
Deuteron passage through a nonpolarized target is accompanied by birefringence effect which reveals as diverse phenomena, namely: rotation of spin and tensor polarization about the momentum direction, spin oscillations, vector polarization conversion to tensor that and vice versa, spin dichroism. Possibility to study deuteron spin dichroism effect i.e. the effect of tensor polarization acquiring by a nonpolarized deuteron beam moving in NuclotronM and passing through its internal target is discussed.
Comments:
24 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2508.11718 [pdf]
1 citation
02
[Submitted on 16 Aug 2025]
HFBTHO-AD: Differentiation of a nuclear energy density functional code
Laurent Hascoët · Matt Menickelly · Sri Hari Krishna Narayanan · Jared O'Neal · Nicolas Schunck · Stefan M. Wild
The HFBTHO code implements a nuclear energy density functional solver to model the structure of atomic nuclei. HFBTHO has previously been used to calibrate energy functionals and perform sensitivity analysis by using derivative-free methods. To enable derivative-based optimization and uncertainty quantification approaches, we must compute the derivatives of HFBTHO outputs with respect to the parameters of the energy functional, which are a subset of all input parameters of the code. We use the algorithmic/automatic differentiation (AD) tool Tapenade to differentiate HFBTHO. We compare the derivatives obtained using AD against finite-difference approximation and examine the performance of the derivative computation.
Comments:
35 pages, 4 Tables, 5 Figures, 3 Appendices
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2508.11910 [pdf]
Comput.Phys.Commun.(2026)·0 citations
03
[Submitted on 16 Aug 2025]
Cluster-breaking and reconfiguration effects in $_{Λ}^{12} B$ hypernucleus
Jiaqi Tian🇨🇳 · Mengjiao Lyu🇨🇳 · Akinobu Dote🇯🇵 · Zheng Cheng🇨🇳 · Takayuki Myo🇯🇵 · Masahiro Isaka🇯🇵 · Hisashi Horiuchi🇯🇵 · Hiroki Takemoto🇯🇵 · Hiroshi Toki🇯🇵 · Niu Wan🇨🇳 · Qing Zhao🇨🇳
We investigate the cluster-breaking effect and spatial distribution of negative-parity states in the $_{Λ}^{12} B$ hypernucleus using the Hyper-Brink model with cluster-breaking(CB-Hyper-Brink) optimized via Control Neural Network (Ctrl.NN). The results demonstrate that the inclusion of cluster-breaking is essential for accurately reproducing the observed low-lying energy levels and for making reliable predictions of the Hoyle-analog state 1-4 in $_{Λ}^{12} B$ . Cluster-breaking manifests as strong spin-orbit correlations and the dissolution of ideal cluster configurations, as revealed by the analysis of one-body spin-orbit operator expectation values and the spatial overlap with projected cluster bases. The interplay between short-range repulsion and intermediate-range attraction in the Lambda N interaction induces the cluster reconfiguration effect, which is characterized by the coexistence of Lambda-alpha and Lambda-triton correlations; this reconfiguration effect leads to a modest stabilization and shrinkage of cluster structures. The variation in electric quadrupole transition strengths, B(E2), between the ground and Hoyle-analog states serves as a sensitive probe for the degree of cluster-breaking, providing direct evidence for its physical relevance. These findings highlight the crucial role of cluster-breaking in characterizing the hypernuclear structure and offer a comprehensive framework for understanding the interplay between clustering and shell-model dynamics in hypernuclei.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2508.11937 [pdf]
PRC(2026)·0 citations
04
[Submitted on 17 Aug 2025]
From Hyperons to Hypernuclei: A New Route to Unravel Proton Spin Polarization
Dai-Neng Liu · Yun-Peng Zheng · Wen-Hao Zhou · Jin-Hui Chen · Che Ming Ko · Yu-Gang Ma · Kai-Jia Sun · Song Zhang
Ultra-relativistic nuclear collisions create the quark-gluon plasma (QGP) known as the hottest, least viscous, and most vortical fluid ever produced in terrestrial laboratories. Its vortical structure has been uncovered through the spin polarization of Lambda ( $Λ$ ) hyperons, attributed to the spin-orbit coupling that transfers the system's orbital angular momentum to the quark spin, which is then inherited by hadrons via quark recombination or coalescence. However, $Λ$ polarization reflects primarily the strange-quark component, leaving the spin dynamics of the up and down quarks largely unexplored. Although the proton is an ideal probe, its stability makes direct measurements experimentally challenging. Here, we propose to unravel proton spin polarization via hypertriton ( $_{Λ}^{3} H$ ) measurements, exploiting the fact that spin information is preserved when polarized nucleons and $Λ$ coalesce to form hypertriton. We show that, over a broad range of collision energies, the polarizations of proton, $Λ$ , and hypertriton are related by a simple linear scaling law. Since both $Λ$ and hypertriton polarizations can be measured via their self-analyzing weak decays, this linear relation provides a practical experimental avenue for accessing spin polarizations of protons and neutrons-the dominant baryonic degrees of freedom in nuclear collisions.
Comments:
11 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2508.12193 [pdf]
8 citations
05
[Submitted on 17 Aug 2025]
Candidates for three-quasiparticle $K$ -isomers in even-odd Fm-Cn nuclei
P. Jachimowicz · M. Kowal · J. Skalski
Following our study of possible $K$ -isomers in odd-even Md-Rg nuclei, here we continue with searching for three-quasiparticle 1 $ν$ 2 $π$ and 3 $ν$ isomer candidates in even-odd Fm - Cn nuclei. We use the same approach to calculate energies of different nuclear configurations using a microscopic-macroscopic model with the Woods-Saxon potential. We used two versions of pairing: quasi-particle BCS method and particle number projection formalism. The optimal deformations for both ground states and high- $K$ configurations are determined through a four-dimensional energy minimization process. We point out the most promising candidates for high- $K$ isomers and compare them, where possible, with existing experimental data.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2508.12236 [pdf]
PRC(2025)·0 citations
06
[Submitted on 17 Aug 2025]
Probing $N N Ω_{ccc}$ three-body systems with the modern QCD $N Ω_{ccc}$ interaction
Faisal Etminan🇮🇷 · Lucas Happ
Newly, first-principles lattice QCD results at the physical pion mass, $m_{π} ⋍ 137.1$ MeV, have been reported by the HAL QCD Collaboration for the S-wave interaction between the nucleon ( $N$ ) and the triply charmed Omega baryon ( $Ω_{ccc}$ ). The $N Ω_{ccc}$ potentials in the spin-1 $(^{3} S_{1})$ and spin-2 $(^{5} S_{2})$ channels were derived and found to be attractive, though no two-body bound state was supported in these channels. The present work investigates the $N N Ω_{ccc}$ three-body system using the Malfliet-Tjon $N N$ potential. Analyses of spin-1, spin-averaged, and spin-2 $N Ω_{ccc}$ channels (at Euclidean times 16, 17, 18) reveal a three-body bound state only for the d- $Ω_{ccc}$ configuration with spin $(0) 1/ 2^{+}$ and $t / a = 16$ . Its binding energy ( $B_{3} = - 2.255$ MeV) lies slightly below the deuteron's ( $B_{d} = - 2.23$ MeV). Other parameter sets do not yield a bound state, and complex scaling analysis indicates these configurations correspond to virtual states rather than resonances. The Coulomb potential's role was also examined to differentiate charged states.
Comments:
15 pages, 6 figures, 3 tables
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat)
arXiv:
2508.12276 [pdf]
1 citation
07
[Submitted on 18 Aug 2025]
Magnetic dipole moments adjacent to doubly-magic nuclei in self-consistent mean-field theory with realistic spin-isospin and tensor forces
H. Nakada · H. Iwata
Magnetic dipole ( $M 1$ ) moments in nuclei neighboring the doubly-magic core are investigated by the self-consistent mean-field (SCMF) approaches that allow for the breaking of the time-reversal symmetry. By the SCMF calculations with the M3Y-P6 interaction, which keeps realistic spin-isospin and tensor channels, the $M 1$ moments are well reproduced, particularly those in the nuclei adjacent to $j j$ -closed magicity. The results are in better agreement with the data than those with the Gogny-D1S interaction, slightly better than those of UNEDF1 supplemented by a spin-isospin channel adjusted to the $M 1$ moments themselves, and comparable to the shell-model results with the chiral effective-field-theory ( $χ$ EFT) interaction. Analyses via quadrupole moments, occupation numbers and the lowest-order perturbation theory elucidate the cooperative effects of quadrupole deformation and spin correlation on the displacement from the Schmidt values, which has been known in terms of the quenching of the spin matrix elements. It is shown that a significant portion of the spin correlation is carried by the spin-isospin and tensor channels in the effective interaction. However, while agreement is remarkable at $^{131}$ Sn $^{m}$ , $^{133}$ Sn and $^{209}$ Pb, discrepancies remain at the $Z = odd$ nuclei $^{133}$ Sb, $^{207}$ Ti and $^{209}$ Bi, as in the $χ$ EFT-based shell-model results.
Comments:
31 pages including 12 figures; to be published in PRC
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2508.12550 [pdf]
PRC(2026)·3 citations
08
[Submitted on 18 Aug 2025]
Influence of Cluster Configurations and Nucleon--Nucleon Scattering Cross-Section on Stopping Power in Heavy-Ion Collisions
S. Y. Yao🇨🇳 · X. G. Deng🇨🇳 · Y. G. Ma🇨🇳
We investigate the impacts of nuclear $α$ -clustering structures and nucleon--nucleon cross-section on nuclear stopping power for $^{16} O$ + $^{40} Ca$ collisions below 300 MeV/nucleon using an extended quantum molecular dynamics (EQMD) model. Our results show that the specific $α$ -clustering configurations of $^{16} O$ --including chain, square, kite, and tetrahedron--have a significant effect on collision dynamics. Among them, the tightly bound tetrahedral structure exhibits the highest stopping power. Moreover, the repulsive Coulomb interaction is found to reduce the stopping power of protons in the Fermi-energy domain. At higher energies, the decreasing trend is influenced by both the nucleon--nucleon cross-section and the mean field.
Comments:
8 pages, 7 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2508.12582 [pdf]
PRC(2025)·2 citations
09
[Submitted on 18 Aug 2025]
Nonlocality parameters of microscopic optical potentials from Skyrme-based nuclear structure models at low energies
Do Quang Tam · N. Hoang Tung · N. Hoang Phuc · T. V. Nhan Hao
We investigate the non-locality parameters $β$ in nucleon-nucleus interactions for $^{16} O$ , $^{40} Ca$ , $^{48} Ca$ , and $^{208} Pb$ using a microscopic optical potential (MOP) derived from nuclear structure models based on Skyrme self-consistent mean-field calculations at low incident energies. No ad hoc adjusted parameters were employed in the present calculations. The analysis reveals that the non-locality parameter exhibits a clear dependence on the radial position within the nucleus, the incident nucleon energy, and the choice of target nucleus. At incident energies below $30$ MeV, the $β$ lies between $0.8$ fm and $1.2$ fm for all considered targets. For the light nucleus $^{16} O$ , the non-locality parameter in the interior is smaller than that on the surface, whereas for medium and heavy nuclei $(^{40} Ca$ , $^{48} Ca$ , and $^{208} Pb$ ), the values are comparable in both regions.
Comments:
7 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2508.12699 [pdf]
0 citations
10
[Submitted on 18 Aug 2025]
Reaction processes of muon-catalyzed fusion in the muonic molecule $dd μ$ studied with the tractable $T$ -matrix model
Qian Wu · Zhu-Fang Cui · Masayasu Kamimura
Muon-catalyzed fusion has recently regained significant attention due to experimental and theoretical developments being performed. The present authors [Phys. Rev. C {\bf 109} 054625 (2024)] proposed the tractable $T$ -matrix model based on the Lippmann-Schwinger equation to approximate the elaborate two- and three-body coupled-channel (CC) calculations [Kamimura, Kino, and Yamashita, Phys. Rev. C {\bf 107}, 034607 (2023)] for the nuclear reaction processes in the muonic molecule $d t μ$ , $(d t μ)_{J = 0} \to^{4} He + n + μ + 17.6 MeV$ . % or $(^{4} He μ)_{n l} + n + 17.6 MeV$ . The $T$ -matrix model well reproduced almost all of the results generated by the CC work. In the present paper, we apply this model to the nuclear reaction processes in the $dd μ$ molecule, $(dd μ)_{J = 1} \to^{3} He + n + μ + 3.27$ MeV or $t + p + μ + 4.03$ MeV, in which the fusion takes place via the $p$ -wave $d$ - $d$ relative motion. Recently, significantly different $p$ -wave astrophysical $S (E)$ factors of the reaction $d + d \to^{3} He + n$ or $t + p$ at $E ≃ 1$ keV to 1 MeV have been reported experimentally and theoretically by five groups. Employing many sets of nuclear interactions that can reproduce those five cases of $p$ -wave $S (E)$ factors, we calculate the fusion rate of the $(dd μ)_{J = 1}$ molecule using three kinds of methods where results are consistent with each other. We also derive the $^{3} He$ - $μ$ sticking probability and the absolute values of the energy and momentum spectra of the emitted muon. The violation of charge symmetry in the $p$ -wave $d$ - $d$ reaction and the $dd μ$ fusion reaction is discussed. Information on the emitted 2.45-MeV neutrons and \mbox{1 keV-dominant} muons should be useful for the application of $dd μ$ fusion.
Comments:
16 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex); Atomic Physics (physics.atom-ph)
arXiv:
2508.12783 [pdf]
PRC(2026)·4 citations
11
[Submitted on 18 Aug 2025]
Radial oscillations of neutron stars within density-dependent relativistic-mean field model
Xuesong Geng🇨🇳 · Kaixuan Huang🇨🇳 · Hong Shen🇨🇳 · Lei Li🇨🇳 · Jinniu Hu🇨🇳
The radial oscillations of neutron stars are studied using equations of state derived from density-dependent relativistic mean-field (DDRMF) models, which effectively describe the ground-state properties of finite nuclei. A novel numerical approach, the finite volume method (FVM), is employed to solve the eigenvalue problem associated with oscillation frequencies. Compared to conventional methods such as the finite difference method and shooting method, the FVM avoids the numerical instability encountered at high frequencies with an equation of state that includes a discontinuous adiabatic index and offers greater computational efficiency. The oscillation frequencies of high-order modes exhibit a similar trend of change. The radial displacements and pressure perturbations are largely influenced by the EOSs of crust region. {The frequency of the first excited state shows a strong linear relationship with both the slope and skewness parameters of the symmetry energy.} These findings suggest that the density dependence of the symmetry energy can be constrained through observations of neutron star radial oscillation frequencies.
Comments:
24 pages, 8 figures, 1 tables, has been accepted by Chines Physics C
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2508.12960 [pdf]
CPC(2025)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE