First observation of excited states in Te-137 and the extent of octupole instability in the lanthanides - art. no. 041301

Authors
Urban, W Korgul, A Rzaca-Urban, T Schulz, N Bentaleb, M Lubkiewicz, E Durell, JL Leddy, MJ Jones, MA Phillips, WR Smith, AG Varley, BJ Ahmad, I Morss, LR
Citation
W. Urban et al., First observation of excited states in Te-137 and the extent of octupole instability in the lanthanides - art. no. 041301, PHYS REV C, 6104(4), 2000, pp. 1301
Citations number
20
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW C-NUCLEAR PHYSICS
ISSN journal
05562813 → ACNP
Volume
6104
Issue
4
Year of publication
2000
Database
ISI
SICI code
0556-2813(200004)6104:4<1301:FOOESI>2.0.ZU;2-C
Abstract
Excited states in Te-137, populated in spontaneous fission of Cm-248, were studied by means of prompt-gamma spectroscopy, using the EUROGAM2 multidete ctor array. This is the first observation of excited states in Te-137. The yrast excitations of Te-137 are due to the three valence neutrons. occupyin g the nu f(7/2) and nu h(9/2) orbitals, similarly as observed in its heavie r N = 85 isotones. Systematic comparison of excited levels in the N = 85 is otones shows inconsistencies in spin and parity assignments in Xe-139 and B a-141 nuclei. The new data for Te-137 do not confirm earlier suggestions th at octupole correlations increase in the N = 85 isotones, close to the Z = 50 closed shell.