January 2017

Journal

High-spin terminating states in the N=88 Ho-155 and Er-156 isotones

By:
Rees, J.; Paul, E.; Simpson, J; Riley, M.; Ayangeakaa, A.; Carpenter, M.; Chiara, C.; Garg, U.; Hampson, P.; Hartley, D; Hoffman, C.R.; Janssens, R.; Kondev, F.; Lauritsen, T.; Mason, P.; Matta, J.; Miller, S.; Nolan, P; Ollier, J.; Petri, M.; Radford, D.; Revill, J.; Wang, X.; Zhu, S.; Gellanki, J.; Ragnarsson, I.
Journal Name:
Physical Review C
Page Number:
054301-054301-17
Volume:
91
Issue Number:
5
Publication Date:
January 2017
View DOI Listing:
https://doi.org/10.1103/PhysRevC.91.054301

Abstract

The Sn-124(Cl-37, 6n gamma) fusion-evaporation reaction at a bombarding energy of 180 MeV has been used to significantly extend the excitation level scheme of Ho-155(67)88. The collective rotational behavior of this nucleus breaks down above spin I similar to 30 and a fully aligned noncollective (band terminating) state has been identified at I-pi = 79/2(-). Comparison with cranked Nilsson-Strutinsky calculations also provides evidence for core-excited noncollective states at I-pi = 87/2(-) and (89/2(+)) involving particle-hole excitations across the Z = 64 shell gap. A similar core-excited state in Er-156(68)88 at I-pi = (46(+)) is also presented.