Evaluation for half-lives in α-decay chains of 309−312 126 based on semi-empirical approaches

Thạc sĩNguyễn Duy LýNguyen Ngoc DuyKuyung Yuk ChaeVinh N. T. PhamT. V. Nhan-Hao

Khoa Khoa Học Cơ Bản

Thể loại: Bài báo

Sơ lược nội dung

In this paper, we estimated half-lives using semi-empirical formulae for isotopes with Z = 100 − 126 in four α-decay chains, which can appear in the syntheses of the 309−312126 nuclei. The spontaneous fission half-lives were calculated using the Anghel, Karpov, and Xu models, whereas the α-decay ones were predicted using the Viola-Seaborg, Royer, Akrawy, Brown, modified formulae of Royer, Ni, and Qian approaches. We found that there are large differences among the spontaneous fission half-lives estimated using the Xu model and those calculated using the others, which are up to 50 orders of magnitude. The α-decay half-lives also have large uncertainties due to difference in either methods or uncertainties in nuclear mass and spin-parities. Subsequently, there is an argument in determination of α-emitters, especially for the 312126 isotope. On the other hand, the α-decay half-lives are in the range from a few microseconds (309−312126) to thousands of years (257−260Fm) in the decay chains. It was found that the half-lives are very sensitive to not only the shell closure but also the angular momentum in the α decay. For experiments, with relatively long half-lives (a few milliseconds), the 289−292Lv isotopes can be observed as evidences for syntheses of the unknown super-heavy 309−312126 nuclei. Furthermore, measurements for precise mass, fission barrier, and spin-parity are necessary to improve accuracy of half-life predictions for super-heavy nuclei.

Thông tin chung
Thể loại
Bài báo
Năm xuất bản
29 Thg12 2020
Ngôn ngữ gốc
Tiếng Anh
Tạp chí công bố
Physica Scripta
Ấn phẩm số
Vo. 96 No. 3
Loại tạp chí
Danh mục ISI
Chất lượng

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