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Nuclear Theory·nucl-th

Monday·April 8, 2024

9 papers—2 primary·7 cross-listed

All9Primary2Cross-lists7
  1. 01

    [Submitted on 5 Apr 2024]

    Gamow-Teller strength distributions of 18O and well-deformed nuclei 24,26Mg by deformed QRPA

    Eunja Ha · Myung-Ki Cheoun · H. Sagawa · Gianluca Colo

    We investigate the Gamow-Teller (GT) transition strength distributions of {strongly} deformed nuclei, Mg, as well as of O. The calculations are performed within a deformed quasi-particle random phase approximation (DQRPA) which explicitly includes the deformation degree of freedom in the Skyrme-Hartree-Fock (SHF) and RPA calculations. The residual particle-particle () interaction as well as the particle-hole () interaction are extracted from Brückner -matrix calculations. The {residual interaction} dependence of the low-lying GT strength of these strongly deformed nuclei is examined by changing the strength of the residual and interactions. We have found that the low-lying GT peaks are quite similar in energy to those found in {spherical} and nuclei near magic shells, but the configurations {of Mg are largely mixed by} the pairing correlations and the deformation. Our results are compared to the experimental GT transition data by (, He) and (He, ) reactions, {and found to reproduce the main features of GT strength distributions.

    Comments:
    25 pages, 23 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2404.03884 [pdf]
    PRC(2024)·3 citations
  2. 02

    [Submitted on 5 Apr 2024]

    Significance of the refraction effect on the - elementary process in the (,) reaction

    Kazuki Yoshida · Yoshiki Chazono · Kazuyuki Ogata

    The proton-induced deuteron knockout reaction, (,), is one of the interests in the studies for probing the deuteron-like - correlation in nuclei. According to a recent study of the inclusive deuteron-induced reaction, , the refraction effect of the deuteron has a significant effect on the elementary process, nucleon-deuteron (-) binary scattering inside a nucleus, of the reaction. In the paper, it is shown that proper treatment of the local - relative momentum in the elementary process is crucial in reactions at MeV and below. In the present work, we investigate the deuteron refraction effect in the exclusive (,) reactions. We also discuss the incident energy dependence of the refraction effect. The refraction effect on the - elementary process is taken into account by the local semiclassical approximation to the distorted waves. The results are compared with those obtained with the asymptotic momentum approximation, which is standardly applied to the distorted wave impulse approximation framework. It is shown that the refraction effect drastically changes the energy sharing distribution of the O(,)N reaction at 101.3 MeV and gives a better agreement with experimental data. In contrast, it is confirmed that the effect is negligibly small at 250 MeV. We have clarified that the deuteron refraction effect is significant in the O(,)N reaction at 101.3 MeV and the experimental data are well reproduced. The refraction effect plays a significant role in both the shape and magnitude of the (,) cross section, while the effect is negligible at 250 MeV.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2404.04115 [pdf]
    PRC(2024)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE