Shell-model studies of medium-heavy nuclei for the neutrinoless-double-beta-decay matrix element and the nuclear Schiff moment

ORAL  · Invited

Abstract

Various search experiments have been performed for new physics beyond the standard model. In these experimental studies, theoretical nuclear structure physics plays an essential role. For example, the nuclear matrix element must be theoretically estimated for the neutrinoless double-beta decay experiments. In this talk, we discuss the neutrinoless-double-beta-decay matrix element of 150Nd and its relation to its nuclear structure, especially to the shape phase transition of the Nd and Sm isotopes, by the large-scale shell-model calculations. We also evaluated the nuclear Schiff moments of 129Xe and 199Hg for the experimental effort to find permanent electric dipole moments. We discuss the nuclear Schiff moment and its relation to the magnetic moment.

*We acknowledge the support of "Program for promoting researches on the supercomputer Fugaku", MEXT, Japan (JPMXP1020230411, JPMXP1020200105) and the MCRP program of the Center for Computational Sciences, University of Tsukuba (wo22i002).

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Publication: [1] K. Yanase, N. Shimizu, K. Higashiyama, and N. Yoshinaga, Phys. Lett. B 841, 137897 (2023).
[2] Y. Tsunoda, N. Shimizu, and T. Otsuka, https://arxiv.org/abs/2304.11780

Presenters

  • Noritaka Shimizu

    • Center for Computational Sciences, University of Tsukuba
    • University of Tsukuba

Authors

  • Noritaka Shimizu

    • Center for Computational Sciences, University of Tsukuba
    • University of Tsukuba

  • Kota Yanase

    • RIKEN Nishina Center

  • Yusuke Tsunoda

    • Center for Nuclear Study, the University of Tokyo
    • University of Tsukuba

  • Takaharu Otsuka

    • Univ of Tokyo