https://doi.org/10.1140/epja/i2006-10456-2
Regular Article - Experimental Physics
Stable collective triaxial rotation in 77Kr
1
Institut für Kernphysik, Universität zu Köln, D-50937, Köln, Germany
2
Mathematical Physics, Lund Institute of Technology, University of Lund, S-221 00, Lund, Sweden
Received:
5
July
2006
Accepted:
21
August
2007
Published online:
14
September
2007
Based on the γ -spectroscopic analysis of G.N. Sylvan et al., configuration-dependent cranked Nilsson-Strutinsky calculations have been performed. They describe the nucleus 77Kr globally in good agreement with the experimental findings and the expectations derived from single-particle orbitals in a deformed potential. Within these calculations, the unambiguous assignment of a configuration with three protons and five neutrons in the g 9/2 shell to the high-spin Yrast states of negative parity indicates that the nucleus 77Kr has stable triaxial deformation and rotates about the intermediate axis. This not only disproves the recent interpretation of an occupation of the d 5/2 orbital being responsible for the strong deformation in this band, but also represents one of the first examples in this mass region for such a rotation.
PACS: 21.60.Ev Collective models – / 21.10.Re Collective levels – / 27.50.+e 59 ⩽ A ⩽ 89 –
© Società Italiana di Fisica and Springer-Verlag, 2007