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Nuclear Theory·nucl-th

Tuesday·August 15, 2023

10 papers—3 primary·7 cross-listed

All10Primary3Cross-lists7
  1. 01

    [Submitted on 12 Aug 2023]

    New extended method for scaling function of inclusive electron scattering

    Lei Wang🇨🇳 · Qinglin Niu🇨🇳 · Jinjuan Zhang🇨🇳 · Jian Liu🇨🇳 · Zhongzhou Ren🇨🇳

    Scaling analyses have been successfully applied to study the inclusive electron scattering over the past few decades. In this paper, we utilize the scaling function in momentum space to analyze the cross sections, where the nucleon momentum distributions are derived from self-consistent mean-field calculations. By further introducing the energy and momentum conservation in the scaling analysis, an improved scaling function is proposed to investigate the high-momentum part of the momentum distributions. Using the proposed scaling function, we systematically explore the effects of the nucleon-nucleon short-range correlation (-SRC) on the cross sections. From the experimental data, the \textit{NN}-SRC strength is further extracted within the framework of the improved scaling function. The studies in this paper offer a new method to investigate the nucleon momentum distributions and the -SRC effects in nuclei.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2308.06506 [pdf]
    SCPMA(2023)·13 citations
  2. 02

    [Submitted on 14 Aug 2023]

    Implications of supermassive neutron stars for the form of the equation of state of hybrid stars

    Hongyi Sun🇨🇳 · Dehua Wen🇨🇳

    The observations of PSR J0952-0607 and the second object in GW190814 event indicate the possible existence of supermassive neutron stars. In this work, by using the Constant-Sound-Speed (CSS) parametrization to describe the equation of state (EOS) of quark matter, the constraints on the EOS parameters from supermassive hybrid stars are investigated through the Maxwell and Gibbs constructions. It is shown that to support a supermassive hybrid star, a lower transition energy density, a smaller energy density discontinuity and a higher sound speed of quark matter are favored. For the constructed hybrid star EOS model, the maximum mass of the corresponding hybrid stars will not meet the lower mass limit of the second object in GW190814 if the energy density discontinuity takes a value higher than . Moreover, it is confirmed that the supermassive neutron star observation can also rule out the existence of twin stars as a supermassive hybrid star requires a relatively small energy density discontinuity. Finally, we give a rough estimate of the lower limit of the dimensionless tidal deformability of neutron stars which ranges from 2 to 3.

    Comments:
    12 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2308.06993 [pdf]
    PRC(2023)·15 citations
  3. 03

    [Submitted on 14 Aug 2023]

    Quantification of spin alignment in fission by simultaneous treatment of gamma and conversion electron angular distributions

    A. Chalil (1 and 2) · O. Litaize (1) T. Materna (2) · A. Chebboubi (1) ((1) CEA, DES, IRESNE, DER, Cadarache F-13108 Saint-Paul-Lez-Durance, France, (2) IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France)

    The study of the angular momentum properties of fission fragments can shed light about the complex mechanisms that characterize the fission process. One quantity that is of significant interest, and has not yet been studied adequately, is the alignment of the fragments, which is the cause of anisotropy of the {\gamma} rays along the fission axis and has been observed in various past and recent experiments. In this work, we have performed calculations using the FIFRELIN code, in an attempt to quantify the alignment of the nuclear spins after neutron-emission. Under the statistical tensor formalism of angular distributions, the conversion-electron and the {\gamma}-ray angular distributions can be treated simultaneously in an event-by-event calculation. This enables a first prediction of the conversion-electron angular distribution with respect to the fission axis. An average value for the alignment of fission fragments is deduced for 252Cf, with the use of recent experimental data. The method used for the present work can serve as a starting point for future theoretical and experimental studies in terms of {\gamma} and conversion-electron spectroscopy in view of studying the spin alignment of individual fission fragments, which could further improve our understanding on the process of fission.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2308.07097 [pdf]
    PRC(2024)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE