Nuclear Theory·nucl-th

Tuesday·March 4, 2025

25 papers—12 primary·13 cross-listed

01
[Submitted on 27 Feb 2025]
Thermal Field Theory in the Presence of a Background Magnetic Field and its Application to QCD
Munshi G. Mustafa🇮🇳 · Aritra Bandyopadhyay🇷🇴 · Chowdhury Aminul Islam🇩🇪
This review has explored the fundamental principles of thermal field theory in the context of a background magnetic field, highlighting its theoretical framework and some of its applications to the thermo-magnetic QCD plasma generated in heavy-ion collisions. Our discussion has been limited to equilibrium systems for clarity and conciseness. We analysed bulk thermodynamic characteristics, including the phase diagram as well as real-time observables, shedding light on the behaviour and dynamics of the thermo-magnetic QCD medium relevant to heavy-ion physics.
Comments:
Invited review in Progress in Particle and Nuclear Physics, modified and refined to match the journal version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2503.00075 [pdf]
PPNP(2026)·5 citations
02
[Submitted on 2 Mar 2025]
Investigation of Gamow-Teller strength of 186Hg within deformed pn-QRPA
Jameel-Un Nabi · Asim Ullah · Abdul Kabir · Abdul Muneem · Mahmut Boyukata
Recently the the total absorption gamma spectroscopy technique was used to determine the Gamow Teller (GT) distribution of \b{eta} decay of 186Hg. It was concluded that the best description of the measured data was obtained with dominantly prolate components for both parent 186Hg and daughter 186Au. Motivated by the recent findings, we investigate the effect of nuclear deformation on the energy distribution of the GT strength of the decay of 186Hg into 186Au within the framework of pn QRPA based on the deformed Nilsson potential. To do the needful, we first calculate the energy levels and shape prediction of 186Hg within the interacting boson model. The computed GT strength distribution satisfied the model independent Ikeda sum rule 100 % (99.98 %) for the prolate (oblate) case. Based on the strength distributions, the deformed pn QRPA model with separable interaction prefers a prolate shape for the ground state of 186Hg and supports the shape coexistence for this nucleus.
Comments:
5 Pages, 1 Figure, 2 Tables
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.00775 [pdf]
Can.J.Phys.(2022)·0 citations
03
[Submitted on 2 Mar 2025]
Thermodynamics of strongly magnetized dense quark matter from hard dense loop perturbation theory
Sarthak Satapathy🇮🇳 · Sumit🇨🇳 · Salman Ahamad Khan🇮🇳
We discuss the hard dense loop perturbation theory approach for studying the thermodynamics of strongly magnetized dense quark matter. The free energy of quarks and gluons have been calculated for one-loop quark and gluon self-energies, respectively. The longitudinal and transverse components of pressure, magnetization, second-order quark number susceptibility, and speed of sound have been computed, and their behavior with chemical potential and magnetic field has been analyzed. Our numerical results show that the longitudinal pressure increases with chemical potential and magnetic field, while for the transverse component, it is diminished. We also analyze the longitudinal component of the speed of sound at high chemical potentials, which approaches the speed of light in the asymptotic limit. The obtained results may be helpful in studying magnetized quark matter in the core of neutron stars and magnetars.
Comments:
20 pages, 10 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
2503.00824 [pdf]
PRD(2025)·3 citations
04
[Submitted on 2 Mar 2025]
SU(3) analysis for B(E2) anomaly
Yu-xin Cheng · De-hao Zhao · Yue-yang Shao · Li Gong · Tao Wang · Xiao-shen Kang
B(E2) anomaly is becoming a hot topic in the field of nuclear structure. Since the B(E2) anomaly was experimentally found, understanding the mechanism of its production has become an important problem. Theoretical studies have found that the SU3-IBM and other extended IBM theories can give explanations, but different mechanisms were found. In this paper, the concept ``SU(3) analysis'' for B(E2) anomaly is proposed, and some new conclusions are obtained. The SU(3) third-order interaction $[L \times Q \times L]^{(0)}$ and level-crossing are both vital for the emergence of the B(E2) anomaly. This technique can help us to better understand the realistic reason of the B(E2) anomaly.
Comments:
Comments are welcome
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.00882 [pdf]
1 citation
05
[Submitted on 3 Mar 2025]
Description of nucleon transfer reactions at intermediate energies within the impulse picture
Sang-In Shim · Yoshiki Chazono · Kazuki Yoshida · Tomohiro Uesaka · Kazuyuki Ogata
Background: At intermediate energies, transfer reactions are suppressed because the momentum-matching condition is difficult to satisfy. In the standard distorted wave Born approximation (DWBA), a high momentum component of the transferred particle is required to match the large momentum transfer. Purpose: We investigate the applicability of the distorted wave impulse approximation (DWIA) for describing ( $p, d$ ) transfer reactions at intermediate energies by performing a comparative study with the standard DWBA. DWIA, which has been successful for knockout reactions, is expected to provide an alternative reaction mechanism at this energy region. Methods: Both DWBA and DWIA formalisms are applied to the $^{16}$ O( $p, d$ ){} $^{15}$ O reaction at 200~MeV. In DWBA, the reaction is described as a neutron pickup, while in DWIA, it is treated as a quasi-elastic scattering from a preformed deuteron cluster in the target. Results: The DWBA calculation is in good agreement with the experimental data, reproducing both the angular distribution and the absolute magnitude of the cross section with a reasonable spectroscopic factor. In contrast, the DWIA calculation, while qualitatively reproducing the trend of the angular distribution, severely underestimates the cross section by about two orders of magnitude. Conclusions: Our findings suggest that conventional DWBA provides a more suitable description for the $^{16}$ O( $p, d$ ){} $^{15}$ O reaction at 200~MeV. The failure of DWIA in this case, unlike its success in knockout reactions, raises open questions about its applicability to transfer reactions. This motivates the need for systematic investigations to delineate the applicability of both reaction mechanisms under various conditions.
Comments:
9 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.01259 [pdf]
PRC(2026)·0 citations
06
[Submitted on 3 Mar 2025]
The nuclear ground-state properties and stellar electron emission rates of 76Fe, 78Ni, 80Zn, 126Ru, 128Pd and 130Cd using RMF and pn-QRPA models
Jameel-Un Nabi · Tuncay Bayram · Gul Daraz · Abdul Kabir · Sevki Senturk
Our study consists of investigations of nuclear ground state properties and weak transition rates of even even waiting point nuclei. The calculation was performed for N = 50 and N = 82 nuclei. The Relativistic Mean Field (RMF) model was used to explore the nuclear ground state properties of selected nuclei. The proton neutron quasi particle random phase (pnQRPA) model was used for the computation of allowed Gamow Teller (GT) and unique first forbidden (U1F) transitions of the selected waiting point nuclei. The RMF approach with different density dependent interactions, DD ME2 and DD PC1, was used to compute potential energy curves and surfaces, quadrupole moments, deformation parameters, binding energies, proton neutron separation energies, charge, and radii. The RMF computed deformation parameters were used in the pn QRPA model, as a free parameter, for the computation of GT and U1F weak transitions. We investigated three different sets of deformation parameter for the calculation of electron emission rates. The rates changed considerably with change in deformation parameter. We later investigated contribution of allowed GT and U1F rates and competition between positron capture and electron emission rates at high stellar temperatures. The computed positron capture rates were significant especially at low densities and high temperatures.
Comments:
32 Pages, 12 Tables, 10 Figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.01280 [pdf]
NPA(2021)·10 citations
07
[Submitted on 3 Mar 2025]
Estimating nuclear equation of state parameters away from saturation density
Naosad Alam · Subrata Pal
We explore the density variation of the correlation coefficient of the key parameters of the nuclear equation of state (EoS) with the bulk and crustal properties of neutron stars. The analysis was performed using two diverse sets of nuclear effective interaction theories based on nonrelativistic Skyrme-Hartree Fock model and relativistic mean field model. We find that the commonly studied EoS parameters, namely the isoscalar incompressibility of symmetric nuclear matter $K (ρ)$ and the isovector slope of symmetry energy $L (ρ)$ , reveal consistently maximum correlation with the radius, tidal deformability, and moment of inertia all around twice the saturation density. We find even more tighter and robust correlations beyond the saturation density for constructed parameter $η = [K L^{2}]^{1/3}$ allowing the possibility to impose stringent constraints on high-density $K (ρ)$ and $L (ρ)$ . Extensive correlation analysis of the EoS parameters with the radius and tidal deformability bounds from the gravitational wave events and recent pulsar observations allow us to provide reliable constraints on the central values of $K (ρ_{0}) \approx 240$ MeV and $L (ρ_{0}) \approx 48$ MeV at saturation density and $K (1.6 ρ_{0}) \approx 33 2_{- 50}^{+ 88}$ MeV and $L (1.6 ρ_{0}) \approx 12 2_{- 18}^{+ 26}$ MeV at 1.6 times the saturation density. The crust-core transition density and the crustal fraction of moment of inertia are shown to correlate moderately with $L (ρ)$ and $η (ρ)$ near the subsaturation density.
Comments:
Revised version; 15 pages, 12 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.01326 [pdf]
PRC(2025)·0 citations
08
[Submitted on 3 Mar 2025]
Effective proton-neutron interaction in mirror nuclei
Y. M. Xing · Y. F. Luo · K. H. Li · Y. H. Zhang · J. G. Li · M. Wang · Yu. A. Litvinov · K. Blaum · X. L. Yan · T. Liao · M. Zhang · X. Zhou
Effective proton-neutron interactions, $V_{p n}$ , in mirror nuclei are systematically analyzed using the ground-state atomic masses. A mirror symmetry of $V_{p n}$ is found for bound nuclei with a standard deviation of $σ = 32$ keV. However, this mirror symmetry is apparently broken for some mirror-nuclei pairs when a proton-unbound nucleus is involved in extracting the $V_{p n}$ values. Such a mirror-symmetry breaking is attributed to the Thomas-Ehrman shift of the proton-unbound nucleus and investigated by using the Gamow shell model. It is concluded that the Thomas-Ehrman shift originates mainly from reduced Coulomb energies in the proton-unbound nuclei due to the extended radial density distribution of valence protons.
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2503.01398 [pdf]
PRC(2025)·4 citations
09
[Submitted on 3 Mar 2025]
Resonant Nuclear Fusion at Second Order
Harishyam Kumar Pankaj Jain
We study the possibility of low energy nuclear fusion assisted by a low energy resonance. We use a simple potential model and replace repulsive Coulomb barrier with a step potential barrier. This is convenient since it allows us to perform analytic calculations and allows better control on approximations. The fusion process involves a proton and another nucleus. We first consider a process in which this transition takes place by emission of a single photon at first order in perturbation theory. At this order we find a very large cross section over a very narrow range of initial momenta, corresponding to the resonance width. The cross section rapidly drops to very small values as we move away from resonance. In any experimental situation, the rate for this process would be negligible since it is practically impossible to have a significant number of initial state particles at precisely the resonant energy. We next consider another process, which involves emission of two photons and gets dominant contribution at second order in perturbation theory. In this case the initial state energy is taken to be larger than the resonance energy. We find a significant cross section, provided the initial energy is larger than the resonant energy. The exponential suppression factors cancel out in this calculation. The experimental signature for this process is two photon emission within very narrow range of energies. One of the photon would be emitted at low energy of order of the initial state energy and the second would correspond to the nuclear energy.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.01421 [pdf]
PRC(2025)·2 citations
10
[Submitted on 3 Mar 2025]
The $α$ -particle condensation in diluted $^{16} O$ at finite temperature
M. Davies🇬🇧 · E. Yüksel🇬🇧 · J.-P. Ebran🇫🇷 · E. Khan🇫🇷 · P. Stevenson🇬🇧
We investigate the effect of temperature on $α$ -particle clustering in the diluted nucleus $^{16} O$ using the multi-constrained finite-temperature relativistic Hartree-Bogoliubov model with the DD-ME2 interaction. At a critical density the nucleus undergoes a Mott-like transition from a homogeneous to a localised configuration characterised by $α$ -particle clustering and the emergence of a finite non-axial octupole deformation. We study the interplay between the onset of localisation under nuclear dilution and the suppression of deformation and $α$ -particle clustering due to increasing temperature. Investigating the temperature-density plane, our findings indicate that temperature delays the formation of non-axial octupole deformation and $α$ -particle clustering in dilute environments. Following the transition from homogeneous to clustered configurations, the non-axial octupole deformation continues to increase with further dilution of the system and becomes nearly independent of temperature. We found that $α$ -particle clusters appear at temperatures up to $T = 4.10$ MeV and at a corresponding normalised density $ρ_{Mott} / ρ_{0} \approx 0.09$ .
Comments:
10 pages, 6 figures, Accepted for publication in Physical Review C
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.01604 [pdf]
PRC(2025)·1 citation
11
[Submitted on 3 Mar 2025]
Charmed hadron production from secondary anti-proton + proton annihilations in p+A reactions at FAIR
Tom Reichert🇩🇪 · Jan Steinheimer🇩🇪 · Marcus Bleicher🇩🇪
We present estimates for the production cross sections of exotic states ( $Λ_{c}, Σ_{c}, Ξ_{c}, D and D_{s}$ ) from secondary $B + B$ annihilations in p+A reactions from $E_{lab} = 10 - 30 A$ ~GeV. We focus specifically on the newly planned hadron physics program of CBM at FAIR. These estimates for the production of exotic states are based on the achievable number of $B + B$ annihilations and their invariant mass distributions calculated in the UrQMD transport model.
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2503.01613 [pdf]
EPJA(2025)·5 citations
12
[Submitted on 3 Mar 2025]
An Efficient Learning Method to Connect Observables
Hang Yu · Takayuki Miyagi
Constructing fast and accurate surrogate models is a key ingredient for making robust predictions in many topics. We introduce a new model, the Multiparameter Eigenvalue Problem (MEP) emulator. The new method connects emulators and can make predictions directly from observables to observables. We present that the MEP emulator can be trained with data from Eigenvector Continuation (EC) and Parametric Matrix Model (PMM) emulators. A simple simulation on a one-dimensional lattice confirms the performance of the MEP emulator. Using $^{28}$ O as an example, we also demonstrate that the predictive probability distribution of the target observables can be easily obtained through the new emulator.
Comments:
5+2 pages, 4 figures, matched published version. Shared data and toy model code in the source file (shared.zip)
Subjects:
Nuclear Theory (nucl-th); Machine Learning (cs.LG); Computational Physics (physics.comp-ph); Machine Learning (stat.ML)
arXiv:
2503.01684 [pdf]
PRL(2026)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE