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Nuclear Theory·nucl-th

Friday·January 10, 2025

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 03

    [Submitted on 9 Jan 2025] (cross-list from hep-ph)

    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.

    Comments:
    6 pages, 3 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2501.05092 [pdf]
    PLB(2025)·12 citations
  2. 04

    [Submitted on 9 Jan 2025] (cross-list from hep-ph)

    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.

    Comments:
    16 pages, 6 figures. Comments are welcomed
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); Computational Physics (physics.comp-ph)
    arXiv:
    2501.05192 [pdf]
    8 citations
  3. 05

    [Submitted on 9 Jan 2025] (cross-list from nucl-ex)

    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.

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2501.05217 [pdf]
    PRC(2025)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE