Speaker
Description
Decay modes and total half-lives of nuclei in the entire region of nuclear chart will be discussed with the use of the spherical-basis method [1]. This method is developed for calculation of ground-state nuclear masses, known as the KTUY mass model [2], and of potential energy surface (including fission barrier height) against nuclear deformations [3]. The global properties of each nuclear decay as alpha- decay [4], beta-decay [5,6], proton emission, and fission [3] will be presented. In the calculation, the existence of ‘Island of superheavy nuclei’ around Z=114 (or 126), and N=184 on the nuclear chart, and ‘Peninsula of superheavy nuclei along N=228, and beyond can be estimated [7]. The appearance of these landscapes is due to the shell closure of (spherical) single-particle levels of nuclei there [8]. We will discuss the limit of existence of nuclei estimated from decay modes with a mass formula, and show the entire landscape of nuclear chart.
[1] H. Koura, M. Uno, T. Tachibana, M. Yamada, Nucl. Phys. A. 674 47, (2000)
[2] H. Koura, T. Tachibana, M. Uno, M. Yamada, Progr. Theor. Phys. 113 305, (2005)
[3] H. Koura, Prog. Theor. Exp. Phys. 2014 113D02-1-10, (2014)
[4] H. Koura, J. Nucl. Sci. Technol., 49 816-823 (2012)
[5] H. Koura and S. Chiba, Phys. Rev. C 95, 064304 (2017)
[6] F. Endo and H. Koura, Phys. Rev. C 99, 034303 (2019)
[7] H. Koura, Nihonium -Physics in superheavy elements and superheavy nuclei-, Kyoritsu Shuppann Co., Ltd., Jun. 2021, (ISBN: 9784320035447) (in Japanese)
[8] H. Koura and S. Chiba, J. Phys. Soc. Jpn. 82, 014201 (2013)
