Nuclear Theory·nucl-th

Tuesday·March 18, 2025

17 papers—8 primary·9 cross-listed

01
[Submitted on 12 Mar 2025]
Radiative corrections for the two-nucleon interaction in effective field theory
Immo C. Reis🇩🇪
Radiative corrections are playing an increasingly significant role in low-energy nuclear physics. We investigate the influence of photons as explicit degrees of freedom within nuclear EFT on the deuteron binding energy, charge form factor, and the radiative capture process $n p \to d γ$ using the velocity renormalization group. In each case, evolving the subtraction velocity to a characteristic nucleon velocity in the bound state induces percent-level modifications in the relevant observables. These findings indicate that electromagnetic corrections represent a non-negligible source of uncertainty in current few-body calculations.
Comments:
12 pages, 5 figures, Parallel talk presented at the 11th International Workshop on Chiral Dynamics (CD2024), 26-30 August, 2024, Ruhr University Bochum, Germany
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.11708 [pdf]
PoS(2026)·0 citations
02
[Submitted on 14 Mar 2025]
Towards shell model interactions with credible uncertainties
Oliver C. Gorton · Konstantinos Kravvaris
Background: The nuclear shell model is a powerful framework for predicting nuclear structure observables, but relies on interaction matrix elements fit to experimental data as its inputs. Extending the shell model's applicability, particularly toward dripline nuclei, requires efficient fitting methods and credible uncertainty quantification. Traditional approaches face computational challenges and may underestimate uncertainties. Purpose: We develop and test a framework combining eigenvector continuation and Markov chain Monte Carlo to efficiently fit shell model interaction matrix elements and quantify their uncertainties. Methods: Eigenvector continuation is used to emulate shell model calculations, reducing computational costs. The emulator enables Markov chain Monte Carlo sampling to optimize interaction matrix elements and rigorously assess parametric uncertainties. The framework is benchmarked using the USDB interaction in the sd shell. Results: The emulator reproduces the USDB interaction with negligible error, validating its use in shell model fitting applications. However, we find that to obtain credible predictive intervals, the model defect of the shell model itself, rather than experimental or emulator error, must be taken into account in order to obtain credible uncertainties. Conclusions: The proposed framework provides an efficient and rigorous approach for fitting shell model interactions and quantifying uncertainties. Further, the normality assumption used in the past appears sufficient to describe the distribution of interaction matrix elements. However, it is crucial to account for model correlations to avoid underestimating uncertainties.
Comments:
Supplemental material provided with Physical Review publication. 16 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.11889 [pdf]
PRC(2025)·2 citations
03
[Submitted on 15 Mar 2025]
Quantification of the evaporation process during fragmentation of space-relevant nuclei on elemental targets
Sukhendu De · V. Choudhary · R. Chatterjee · W. Horiuchi
This study examines charge-changing cross sections for 12C, 14N, 16O, and 20Ne projectiles on elemental targets (C, Al, Cu) at a beam energy of around 290 MeV/nucleon. The two-stage abrasion-ablation model is used, with the abrasion stage described via the Glauber model, incorporating validated single-nucleon density distributions from proton elastic scattering data. In the ablation stage, where particle evaporation occurs, the contribution to charge-changing cross sections is estimated using two approaches. First, a statistical decay model is employed to analyze the evaporation of protons following neutron removal in the abrasion stage. The second approach estimates evaporation contributions by subtracting the direct process component (abrasion) from the experimental charge-changing cross section data. A comparison between these estimated contributions from the experimental data and the predictions of the statistical model enables a systematic evaluation of the evaporation process. The key factors influencing evaporation, such as excitation energy distribution parameters, decay width of the emitted particles, and nucleon separation energies, are analyzed. A strong correlation is observed between the maximum excitation energy available for evaporation and the neutron separation energy of the projectiles across different targets, highlighting the role of evaporation dynamics in the charge-changing cross sections.
Comments:
31 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2503.12017 [pdf]
PRC(2025)·0 citations
04
[Submitted on 15 Mar 2025]
Study of \b{eta}-Decay, log ft Values and Nuclear Structure Properties of Neutron-rich Ge Nuclei
Jameel-Un Nabi · Wajeeha Khalid · Abdul Kabir · Syeda Anmol Rida
We use the relativistic mean field (RMF) model to conduct a thorough analysis of the ground-state properties of $^{67 - 80}$ Ge nuclei. Binding energies and neutron skin thicknesses are computed for a total of 14 neutron-rich Ge isotopes. This study provides a comprehensive overview of the RMF model's explanation of nuclear ground-state properties. Furthermore, we examine the $lo g f t$ values of the allowed $β^{\pm}$ decays and electron/positron capture rates on Ge isotopes in the mass region $A = 67 - 80$ . The proton-neutron quasiparticle random phase approximation (pn-QRPA) method was employed to calculate the $β$ -decay properties of selected Ge isotopes. The calculated $lo g f t$ values show good consistency with the measured data. The predicted $β$ -decay half-lives are within a factor of 2 of the measured values. For high temperature and density conditions in the core of massive stars, the calculated pn-QRPA stellar rates are up to an order of magnitude larger than the independent shell model rates. The findings reported in this study could be valuable for simulating the late-stage stellar evolution of massive stars.
Comments:
24 Pages, 7 Tables, 5 Figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.12089 [pdf]
Arab.J.Sci.Eng.(2025)·0 citations
05
[Submitted on 17 Mar 2025]
Nuclear Excitation and Control Induced by Intense Vortex Laser
Zhi-Wei Lu · Hanxu Zhang · Tao Li · Mamutjan Ababekri · Xu Wang · Jian-Xing Li
The existing intense laser-based approaches for nuclear excitation offer ultrafast temporal resolution and high efficiency compared to traditional accelerator probes. However, controlling nuclear properties such as spin and magnetic moment remains an unprecedented challenge. Here, we put forward a novel method for nuclear excitation and control induced by intense vortex lasers. We develop a theory incorporating the orbital angular momentum (OAM) of vortex laser within the nuclear hyperfine mixing framework. We find that intense vortex laser can effectively excite hydrogen-like thorium-229 nucleus and induce three-dimensional rotation of the nuclear magnetic moment. This rotation arises from the localized electromagnetic field and new transition channels excited by the vortex laser, and can be reconstructed through radiation spectrum analysis. Moreover, the OAM of vortex laser enables the chaotic system to exhibit topologically protected periodic patterns in nuclear excitation and radiation, facilitating precise experimental measurements. Our findings underscore the potential of vortex laser for high-precision nuclear control and imaging, deepening our understanding of nuclear properties and hyperfine structure, and advancing quantum information and nuclear technologies.
Subjects:
Nuclear Theory (nucl-th); physics.optics (physics.optics)
arXiv:
2503.12812 [pdf]
PRC(2026)·3 citations
06
[Submitted on 17 Mar 2025]
Effect of transverse momentum conservation and flow on symmetric cumulants $s c_{2, 3} {4}$ and $s c_{2, 3, 4} {6}$
Jia-Lin Pei🇨🇳 · Guo-Liang Ma🇨🇳 · Adam Bzdak🇵🇱
Symmetric cumulants can improve our understanding of the joint probability distribution function $P (v_{m}, v_{n}, v_{k}, \dots, Ψ_{m}, Ψ_{n}, Ψ_{k}, \dots)$ , potentially offering new insights into the nature of the fluctuations of the quark-gluon plasma produced in relativistic heavy-ion collisions. In this work, the four-particle symmetric cumulants $s c_{2, 3} {4}$ , six-particle symmetric cumulants $s c_{2, 3, 4} {6}$ , and the normalized cumulants $n s c_{2, 3} {4}$ and $n s c_{2, 3, 4} {6}$ originating from transverse momentum conservation, collective flow, and the interplay between the two effects are calculated. Our results on $s c_{2, 3} {4}$ are consistent with the ATLAS data using the subevent cumulant method, facilitating a more profound understanding of the origins of the symmetric cumulant in small systems. Our results on $s c_{2, 3, 4} {6}$ serve as theoretical predictions for future experimental measurements in small systems.
Comments:
28 pages, 4 figures, final published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2503.12846 [pdf]
PRC(2025)·3 citations
07
[Submitted on 17 Mar 2025]
On the mapping after and before truncation in the boson expansion theory
Kimikazu Taniguchi
Using the norm operator method, which extends and corrects the conventional boson expansion theories, we investigate two boson mappings of the boson expansion theory, the so-called mapping after truncation and the mapping before truncation. The difference between them stems from the treatment of the phonon excitation modes; those not adopted as boson excitation modes in the former mapping are first all adopted as boson excitation modes and then truncated later in the latter mapping. If and only if the commutation relations among the phonon operators are closed among the excitation modes adopted as the boson excitation modes in the mapping after truncation, the mapping after and the mapping before truncation coincide, not depending on the types, Hermitian and non-Hermitian. We also investigate the Park operator, which judges whether a boson state vector is physical, and reveal that the conventional claim, which claims that it is applicable only when the mapping is that of the whole fermion space, is incorrect.
Comments:
18 pages
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2503.12892 [pdf]
0 citations
08
[Submitted on 17 Mar 2025]
Spectral properties and spin alignment of $ϕ$ meson in QCD Matter
Zhong-Yuan Sun🇨🇳 · You-Yu Li🇨🇳 · Shuai Y. F. Liu🇨🇳
As the spin alignment of a vector meson is predicted to be correlated with its spectral properties, we study the spectral properties of the $ϕ$ meson using two microscopic Lagrangians based either on chiral effective field theory or the quark-meson model. We calculate the self-energies and spectral functions of the $ϕ$ meson for these two Lagrangians at the one-loop level within the Matsubara formalism of finite-temperature quantum field theory, employing various parameters to represent different physical scenarios. Using these spectral functions, transport coefficients related to the spin alignment and tensor polarization are obtained, connecting the spin alignment of the $ϕ$ meson to hydrodynamic gradients. Using the standard freeze-out picture within the relativistic hydrodynamic model, we explore how the possible pattern of the spin alignment can be generated using these microscopically calculated spectral functions. We discover that, with certain assumptions, these simple microscopic model-based calculations can produce sizable spin alignments with a sign-flipping behavior in their $p_{T}$ and centrality dependence, similar to those observed in experiments.
Comments:
11 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex)
arXiv:
2503.13408 [pdf]
2 citations

Affiliations

first authorsco-authorsvia INSPIRE