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Nuclear Theory·nucl-th

Friday·January 10, 2025

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    Analysis of clustering fragments of Li and Be in the microscopic cluster model

    De-Ye Tao · Bo Zhou · Si-Min Wang · Yu-Gang Ma

    The nuclear structures of Li() and Be() are studied within the microscopic cluster model, in which the clustering fragments e.g., triton, He, and even the single nucleons around the core are studied in the Li and Be systems. We obtain the energy spectra and wave functions of Li and Be, and the calculated energy spectra of the ground states and some of the excited states are consistent with experimental data. To investigate the cluster-formation probabilities, we calculate the reduced-width amplitudes of various binary partitions. The results show that the cluster structure is dominant in the low-lying states of Li(Be), including the ground state and the three lowest excited states. In some higher states around the single-particle thresholds, the components of structures, namely and in Li and in Be, are significantly enhanced.

    nucl-thPRC(2025)·1 citation
  2. 02

    Shell effects and multi-chance fission in the sub-lead region

    F.A. Ivanyuk🇺🇦 · C. Schmitt🇫🇷 · C. Ishizuka🇯🇵 · S. Chiba🇯🇵

    Within the recently developed five-dimensional Langevin approach for the description of fission of heavy nuclei, we have calculated the fission fragments mass and kinetic energy distributions for the fission of Hg and Hg formed in the reactions Ar +Sm Hg and Ar +Sm Hg at few excitation energies and found very good agreement between the calculated and experimental results. Special attention was paid to the accurate description of the dependence of shell effects on the excitation energy. It was shown that the effect of multi-chance fission on the mass distribution is noticeable only at small excitation energies. The kinetic energy distributions are more sensitive to pre-scission neutron emission.

    nucl-thPRC(2025)·7 citations
  3. 03

    Spin-orbit correlation and spatial distributions for spin-0 hadrons

    Cédric Lorcé🇫🇷 · Qin-Tao Song🇨🇳

    The spin-orbit correlation in spin-0 hadrons can be investigated through the kinetic energy-momentum tensor form factor . We observe that the latter is also related to a torque about the radial direction, which we interpret as a chiral stress. If we neglect the quark mass contribution, then is simply proportional to the electromagnetic form factor for spin-0 hadrons, and the spin-orbit correlation is equal to minus half of the valence quark number. Given the extensive studies on the electromagnetic form factor for spin-0 hadrons such as pions, kaons, and the particle, we present the spatial distributions of chiral stress and kinetic spin-orbit correlation based on current parametrizations of the pion electromagnetic form factor.

    ↳ hep-phhep-latnucl-exnucl-thPLB(2025)·12 citations
  4. 04

    On the Calculation of Pressure Derivatives in Mean-Field Thermal Field Theories

    Hosein Gholami🇩🇪

    Accurate determination of higher-order pressure derivatives with respect to temperature and chemical potential is essential for analyzing critical phenomena, transport properties, and phase transitions in strongly interacting matter. However, standard numerical differentiation methods often suffer from large numerical instabilities, especially in more complex mean-field thermal field theories. In this work, we present an approach that systematically derives symbolic expressions for these higher-order derivatives, bypassing the numerical instabilities commonly encountered in conventional methods. Our formalism is based on a Jacobian technique, which ensures that the dependence of internal mean-field parameters is fully incorporated into the final symbolic expressions. We illustrate the effectiveness of this method using the two-flavor Nambu-Jona-Lasinio model as an example and show that it is particularly advantageous near phase transitions and at low temperatures, where numerical differentiation becomes highly sensitive.

    ↳ hep-phnucl-thphysics.comp-ph8 citations
  5. 05

    Probing Nuclear Excitation by Electron Capture in an Electron Beam Ion Trap with Non-destructive Isomer Detection via Precision Mass Spectrometry

    Bingsheng Tu · Nan Xue · Jialin Liu · Qi Guo · Yuanbin Wu · Zuoye Liu · Adriana Pálffy · Yang Yang · Ke Yao · Baoren Wei · Yaming Zou · Xiangjin Kong · Yu-Gang Ma

    Nuclear excitation by electron capture (NEEC) is an important nuclear excitation mechanism which still lacks conclusive experimental verification. This is primarily attributed to strong background x-/-ray noise and competing nuclear excitation processes which would overshadow the signals in various environments that NEEC takes place. Here, we propose an experimental approach to observe the NEEC process within a background-free environment. Through collisions with a highly-compressed mono-energetic electron beam in an electron beam ion trap, nuclei may get excited to a long-lived isomeric state via the NEEC process. Subsequently, ions can be extracted and Penning-trap mass spectrometry employed to unambiguously detect the isomer. Our study focuses on the promising candidate , demonstrating measurable detection rates of the NEEC process and discussing the feasibility of the proposed approach. This new approach for observing the NEEC process may be realized in the near future.

    ↳ nucl-exnucl-thPRC(2025)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE