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Collective structures up to spin ~ 65hbar in the N = 90 isotones 158Er and 157Ho...

by X. Wang, M. Riley, David C Radford, I. Ragnarsson
Publication Type
Conference Paper
Journal Name
Journal of Physics: Conference Series
Publication Date
Page Number
012065
Volume
381
Issue
1
Conference Name
Rutherford Centennial Conference on Nuclear Physics
Conference Location
Manchester, United Kingdom
Conference Sponsor
Various
Conference Date
-

A new collective band with high dynamic moment of inertia in 158Er at spins beyond band termination has been found in addition to the two previously reported ones. The measured transition quadrupole moments (Qt) of these three bands are very similar. These three bands have been suggested to possess a triaxial strongly deformed shape, based on comparisons with calculations using the cranked Nilsson-Strutinsky model and with tilted axis cranking calculations using the Skyrme-Hartree-Fock model. In addition, three collective bands with similar high dynamic moments of inertia, tentatively assigned to 157Ho, have been observed. Thus, it is suggested that all these structures share a common underlying character and that they are most likely associated with triaxial strongly deformed minima which are predicted to be close to the yrast line at spin 50 – 70hbar.