Eur. Phys. J. A (2010) 46: 403-411
https://doi.org/10.1140/epja/i2010-11057-2

Regular Article - Theoretical Physics

Systematic study of properties of Hs nuclei

¹ Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
² School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, China
³ Institut für Theoretische, Physik der Universität, 35392, Giessen, Germany

Received: 29 June 2010
Accepted: 22 October 2010
Published online: 14 November 2010

Abstract

The ground-state properties of Hs nuclei are studied in the framework of the relativistic mean-field theory. We find that the more relatively stable isotopes are located on the proton abundant side of the isotopic chain. The last stable nucleus near the proton drip line is probably the ²⁵⁵Hs nucleus. The -decay half-lives of Hs nuclei are predicted, and together with the evaluation of the spontaneous-fission half-lives it is shown that the nuclei, which are possibly stable against spontaneous fission are ^263-274Hs . This is in coincidence with the larger binding energies per nucleon. If ^271-274Hs can be synthesized and identified, only those nuclei from the upper Z = 118 isotopic chain, which are lighter than the nucleus ²⁹⁴118 , and those nuclei in the corresponding -decay chain lead to Hs nuclei. The most stable unknown Hs nucleus is ²⁶⁸Hs . The density-dependent delta interaction pairing is used to improve the BCS pairing correction, which results in more reasonable single-particle energy level distributions and nucleon occupation probabilities. It is shown that the properties of nuclei in the superheavy region can be described with this interaction.