γ-ray Spectroscopy of ¹⁶⁶Hf: X(5) in N > 90?

Authors

E. A. McCutchan
N. V. Zamfir
R. F. Casten
M. A. Caprio
H. Ai
H. Amro
C. W. Beausang, University of RichmondFollow
A. A. Hecht
D. A. Meyer
J. J. Ressler

DOI

10.1103/PhysRevC.71.024309

Abstract

Excited states in ¹⁶⁶Hf were populated in the β+/∈ decay of ¹⁶⁶Ta and studied through off-beam γ –ray spectroscopy at the Yale moving tape collector. New coincidence data found no support for two previously reported excited 0⁺ states and led to a substantially revised level scheme. Similarities between the revised level scheme of ¹⁶⁶Hf and the X(5) critical point symmetry are discussed, and the extent of X(5) behavior in this mass region is explored through the W and Os isotopes. Among X(5) candidates with N > 90, good agreement is observed for most energies and interband B(E2) strengths, while all exhibit similar disagreements with other key observables, in particular, yrast B(E2) values and spacing in the excited K = 0⁺ sequence.

Document Type

Article

Publication Date

2-22-2005

Publisher Statement

Copyright © 2005 The American Physical Society. This article first appeared in Physical Review C 71, no. 2 (February 22, 2005): 024309-1-24309-9. doi:10.1103/PhysRevC.71.024309.

Please note that downloads of the article are for private/personal use only.

Recommended Citation

McCutchan, E., N. Zamfir, R. Casten, M. Caprio, H. Ai, H. Amro, C. Beausang, A. Hecht, D. Meyer, and J. Ressler. "γ-ray Spectroscopy of Hf166:X(5) in N90?" Physical Review C 71, no. 2 (February 22, 2005): 024309-1-24309-9. doi:10.1103/PhysRevC.71.024309.