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Title: Configurations and decay hindrances of high- K states in Hf 180

Multi-quasiparticle high-K states, several of which are isomeric, were observed in Hf-180 with the Gammasphere array. We determined the lifetimes in the ns-μs range using centroid-shift and decay measurements within a mu s coincidence time window. The configurations of high-K states involve two and four quasiparticles, with states up to K π = (18 -) established. High-K excitations are found to be progressively more favored with increasing excitation energy. The K quantum number is quite robust up to the highest spins observed, as evidenced by the large values of the reduced hindrance for isomeric decays. Furthermore, rotational bands built on three high-K states are identified, and the measured branching ratios in these sequences enable the assignment of underlying configurations. Multi-quasiparticle calculations using the Lipkin-Nogami approach for pairing, with blocking included, reproduce the observed high-K energies quite well.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [3] ;  [4] ;  [3] ;  [3] ;  [5] ;  [5] ;  [3] ;  [6] ;  [3] ;  [5]
  1. Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics; Univ. of Mumbai (India). Centre for Excellence in Basic Sciences (DAE)
  2. Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Univ. of Manchester (United Kingdom)
  6. Univ. of Liverpool (United Kingdom)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; FG02-94ER40848; FG02-94ER40834
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1390818
Alternate Identifier(s):
OSTI ID: 1334221