Abstract
Abstract The β decay of 75 192 Re117, which lies near the boundary between the regions of predicted prolate and oblate deformations, has been investigated using the KEK Isotope Separation System (KISS) in RIKEN Nishina Center. This is the first case in which a low-energy beam of rhenium isotope has been successfully extracted from an argon gas-stopping cell using a laser-ionization technique, following production via multi-nucleon transfer between heavy ions. The ground state of 192Re has been assigned J π = ( 0 − ) based on the observed β feedings and deduced logft values towards the 0 + and 2 + states in 192Os, which is known as a typical γ-soft nucleus. The shape transition from axial symmetry to axial asymmetry in the Re isotopes is discussed from the viewpoint of single-particle structure using the nuclear Skyrme-Hartree-Fock model.
Highlights
J π = (0−) based on the observed β feedings and deduced log f t values towards the 0+ and 2+ states in 192Os, which is known as a typical γ -soft nucleus
The shape transition from axial symmetry to axial asymmetry in the Re isotopes is discussed from the viewpoint of single-particle structure using the nuclear Skyrme-Hartree-Fock model
The deformation in the nuclear equilibrium shape is an exemplary case of the spontaneous symmetry breaking [1] that can be found in many areas of physics
Summary
351-0198, Japan d Department of Physics, University of York, York, YO10 5DD, United Kingdom e Advanced Science Research Center, Japan Atomic Energy Agency, Tokai-Mura, Naka-gun, Ibaraki 319-1195, Japan f Rare Isotope Science Project, Institute for Basic Science (IBS), Daejeon 305-811, Republic of Korea g Physics Division, Argonne National Laboratory, Lemont, IL 60439, USA h Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia i GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany j Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong k Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain l University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan m Department of Physics, Kyushu University, Fukuoka 819-0395, Japan n Department of Physics, Harbin Institute of Technology, Harbin 150001, China o Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom article info.
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