Eur. Phys. J. A (2019) 55: 166
https://doi.org/10.1140/epja/i2019-12864-5

Regular Article - Theoretical Physics

Theoretical predictions for -decay properties of ^283-339Og using a shell-effect induced generalized liquid-drop model

¹ Key Laboratory of Beam Technology of Ministry of Education, Beijing Radiation Center, 100875, Beijing, China
² College of Nuclear Science and Technology, Beijing Normal University, 100875, Beijing, China
³ Department of Physics, Beijing Normal University, 100875, Beijing, China
⁴ Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, RU-141980, Dubna, Russia
⁵ Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, 730000, Lanzhou, China

^* e-mail: fszhang@bnu.edu.cn

Received: 23 June 2019
Accepted: 23 August 2019
Published online: 30 September 2019

Abstract

The -decay half-lives of synthesized superheavy nuclei (SHN) from seaborgium to oganesson are calculated by employing the generalized liquid-drop model (GLDM), the Royer formula and the universal decay law (UDL) with experimental -decay energies . For the GLDM, we consider the shell correction. The agreement between the experimental data and the calculations indicates that all the methods we used are successful to reproduce -decay half-lives of known SHN. The decay-modes of known nuclei on the ²⁹⁴Og decay-chain are also consistent with the experiments. For the unknown nuclei, the -decay half-lives have been predicted by inputting values extracted from the newest Weizsäcker-Skyrme-4 (WS4) model. In the GLDM with shell correction, we adopt the constant -preformation factor as well as extracted by Cluster Formation Model (CFM). To calculate CFM values, we use FRDM binding energies and WS4 mass excess values. The relationship of and shows that ^{294, 296, 314, 316, 320}Og isotopes are relatively stable. The competition between -decay and spontaneous fission is discussed in detail for ^283-339Og isotopes. The decay-chains of ^290-300Og have also been presented. Since the -decay half-lives of ^283-303Og isotopes are obviously lower than their spontaneous fission half-lives by more than 6 orders, these isotopes would mainly have -decay. The ^306-334Og isotopes may undergo spontaneous fission. The nuclei ^{304, 305}Og would have both -decay and spontaneous fission. By the shell-effect included GLDM with CFM , we predict ²⁹⁵Og undergoes -decay and ms. The ²⁹⁶Og is also -decay and has ms.