Nuclear Theory·nucl-th

Tuesday·July 8, 2025

19 papers—7 primary·12 cross-listed

01
Nuclear $β^{-}$ -decay with statistical de-excitation
M. R. Mumpower · T. Kawano · O. Korobkin · G. W. Misch · T. M. Sprouse
The accurate description of nuclear $β^{-}$ -decay has far-reaching consequences for applications spanning nuclear reactors to the creation of heavy elements in astrophysical environments. We present the nuclear particle spectra associated with the $β$ -decay of neutron-rich nuclei calculated with the well benchmarked coupled Quasi-particle Random Phase Approximation and Hauser-Feshbach (QRPA+HF) model. This approach begins with the population of the daughter nucleus via semi-microscopic Gamow-Teller or First-Forbidden strength distributions (QRPA) and follows the statistical de-excitation (HF) until the initial available excitation energy is exhausted. At each stage of de-excitation the emission by neutrons and $γ$ -rays is considered obeying quantum mechanical selection rules. For completeness we also provide parsed Auger and Internal Conversion (IC) electron spectra from Evaluated Nuclear Data Files (ENDF). Our results are tabulated and provided in parsable ASCII formatted tables that are suitable for inclusion in various applications.
nucl-thAtom.Data Nucl.Data Tabl.(2025)·3 citations
02
Equation-of-State Independent Relations in Rapidly Rotating Hybrid Stars
Sujan Kumar Roy🇮🇳
We study 22 hadronic and 100 hybrid equations of state (EoSs) that allow for heavy baryons and deconfined quark matter at high densities, aiming to establish quasi-universal relations for both slowly and rapidly rotating neutron stars. All EoSs are consistent with current observational constraints, including NICER and GW170817. Our results confirm that the I-Love-Q and I-C-Q relations remain approximately EoS-insensitive across this broad EoS set, with deviations typically within 10\% for hadronic stars and up to 20\% for those with complex core compositions. These relations are extended to include low-mass neutron stars such as HESS J1731-347, and to stars with general core compositions--nucleonic, hyperonic (full baryon octet), and quark matter. The analysis underscores both the robustness and the limitations of universal relations when applied to compact stars with exotic degrees of freedom and rapid rotation.
nucl-thJCAP(2025)·1 citation
03
$Λ$ -deuteron momentum correlation functions incorporating deuteron breakup contributions in Faddeev formulation
M. Kohno🇯🇵 · H. Kamada🇯🇵
The effects of the deuteron breakup are estimated for the $Λ$ -deuteron momentum correlation function. Faddeev amplitudes in calculating low-energy $Λ$ -deuteron scattering can provide not only the elastic scattering part but also breakup wave functions in the incident and the rearrangement channels. Calculations are carried out using nucleon-nucleon (NN) and hyperon-nucleon (YN) interactions parametrized in chiral effective field theory. The effects of the breakup in the incident channel are found to be marginally insignificant. Those of the rearrangement channel are not negligible, but not large when the source radius is larger than 2.5 fm. Nevertheless, it is worthwhile to have the information on the magnitude of these effects in analyzing the experimental data.
nucl-thPRC(2025)·4 citations
04
Variational Theory and Parquet Diagrams for Nuclear Systems: A Comprehensive Study of Neutron Matter
Eckhard Krotscheck · Jiawei Wang
To deal with the problem of realistic nuclear interactions we have combined techniques of the Jastrow-Feenberg variational method and the local parquet-diagram theory. In the language of diagrammatic perturbation theory, ``commutator diagrams'' can be identified with non-parquet diagrams. We examine the physical processes described by these terms and include the relevant diagrams in a way that is suggested by the Jastrow-Feenberg approach. We show that the corrections from non-parquet contributions are, at short distances, larger than all other many-body effects. We examine here neutron matter as a prototype of systems with state-dependent interactions. Calculations are carried out for neutrons interacting via the so-called $v_{8}$ version of four popular interactions. We determine the structure and effective interactions and apply the method to the calculation of the energetics, structure and dynamic properties such as the single-particle self-energy and the dynamic response functions as well as BCS pairing in both singlet and triplet states. We find that many-body correlations lead to a strong reduction of the spin-orbit interaction, and, therefore, to a suppression of the $^{3} P_{2}$ and $^{3} P_{2}$ - $^{3} F_{2}$ gaps. We also find pairing in $^{3} P_{0}$ states; the strength of the pairing gap depends sensitively on the potential model employed.
nucl-thEPJA(2026)·0 citations
05
Particle species dependence of elliptic flow fluctuations in Pb-Pb collisions at LHC energies in a multiphase transport model
Jie Wan🇨🇳 · Chun-Zheng Wang🇨🇳 · Yu-Gang Ma🇨🇳 · Qi-Ye Shou🇨🇳 · Song Zhang🇨🇳
The fluctuations of elliptic flow (\vtwo) in relativistic heavy-ion collisions offer a powerful tool to probe the collective behavior and transport properties of the quark-gluon plasma (QGP). The dependence of these fluctuations on particle species further sheds light on the hadronization mechanism. At LHC energies, the ALICE experiment has measured $v_{2}$ fluctuations for charged pions, kaons, and (anti-)protons via the ratio of \vtwo measured with respect to the spectator plane (\vtwosp) and from the four-particle cumulants (\vtwofour). However, the observed dependencies on transverse momentum and particle type remain not fully understood. In this study, we perform a phenomenological investigation using a multiphase transport (AMPT) model, which allows us to trace the full evolution of flow fluctuations intertwined with the quark coalescence. The results qualitatively reproduce the ALICE measurements and offer deeper insights into the transport dynamics and hadronization of the QGP.
nucl-thPRC(2025)·1 citation
06
From Nuclear Matter with Quenched $g_{A}$ to Compact-Star Matter with a Signal for Emergent Hidden Scale Symmetry
Mannque Rho🇫🇷
An ``unorthodox" idea is developed that the long-standing mystery in nuclear physics of the effective axial-current coupling constant in nuclei, $g_{A}^{eff} \approx 1$ , could be interpreted in terms of an emerging hidden scale symmetry in dense compact-star matter. Arguments are presented using an effective field theory anchored on a renormalization-group approach to interacting baryons on the Fermi surface coupled with hidden symmetric heavy mesonic degrees of freedom that enables one to go beyond Weinberg's nuclear effective field theory involving nucleon and pion fields only, referred hereon to as $χ$ EFT $_{π}$ . Both hidden local and scale symmetries, the former involving the vector mesons $ρ$ and $ω$ and the latter the hidden scalar meson, a dilaton $σ^$ (i.e., $f_{0} (500)$ ), play the crucial role. Going beyond the density regime applicable to normal nuclear matter $n_{0}$ , the notion of ``hadron-quark continuity HQC)" is brought in via the skyrmion structure of the nucleon argued to be valid in QCD at large $N_{c}$ limit and the large $N^{'}$ limit of the Grassmannian model $G / H = [O (N^{'}) / O (N^{'} - p) \times O (p)]$ where $N^{'} = 4$ and $p = 2$ for hidden local symmetry and the IR fixed point in QCD for $N_{f} \leq 3$ involving ``genuine/QCD-conformal dilaton" for hidden scale symmetry. The connection between the quenched $g_{A}$ and the sound speed $v_{s}^{2} / c^{2} \approx 1/3$ inside dense compact stars could be interpreted as a signal for emergent ``pseudo-conformal" symmetry.
nucl-thastro-ph.SRhep-phJ.Subatomic Part.Cosmol.(2025)·2 citations
07
Extraction of ground-state nuclear deformations from ultra-relativistic heavy-ion collisions: Nuclear structure physics context
J. Dobaczewski🇬🇧 · A. Gade🇺🇸 · K. Godbey🇺🇸 · R.V.F. Janssens🇺🇸 · W. Nazarewicz🇺🇸
The collective-flow-assisted nuclear shape-imaging method in ultra-relativistic heavy-ion collisions has recently been used to characterize nuclear collective states. In this paper, we assess the foundations of the shape-imaging technique employed in these studies. We argue that some current UHIC nuclear imaging techniques neglect fundamental aspects of spontaneous symmetry-breaking and symmetry-restoration in colliding ions and incorrectly infer one-body multipole moments from studies of nucleonic correlations. Therefore, the impact of this approach on nuclear structure research has been overstated. Conversely, efforts to incorporate existing knowledge on nuclear shapes into analysis pipelines can be beneficial for benchmarking tools and calibrating models used to extract information from ultra-relativistic heavy-ion experiments.
nucl-thhep-exhep-phnucl-exPRResearch(2025)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE

Nuclear β−-decay with statistical de-excitation

Equation-of-State Independent Relations in Rapidly Rotating Hybrid Stars

Λ-deuteron momentum correlation functions incorporating deuteron breakup contributions in Faddeev formulation

Variational Theory and Parquet Diagrams for Nuclear Systems: A Comprehensive Study of Neutron Matter

Particle species dependence of elliptic flow fluctuations in Pb-Pb collisions at LHC energies in a multiphase transport model

From Nuclear Matter with Quenched gA​ to Compact-Star Matter with a Signal for Emergent Hidden Scale Symmetry

Extraction of ground-state nuclear deformations from ultra-relativistic heavy-ion collisions: Nuclear structure physics context

Affiliations

Nuclear $β^{-}$ -decay with statistical de-excitation

$Λ$ -deuteron momentum correlation functions incorporating deuteron breakup contributions in Faddeev formulation

From Nuclear Matter with Quenched $g_{A}$ to Compact-Star Matter with a Signal for Emergent Hidden Scale Symmetry