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Title: Experimental study of isomeric intruder 1 2 + states in At 197 , 203

A newly observed isomeric intruder ½ + state [T ½=3.5(6)ms] is identified in 203At using a gas-filled recoil separator and fusion-evaporation reactions. The isomer is depopulated through a cascade of E3 and mixed M1/E2 transitions to the 9/2 ground state, and it is suggested to originate from the π(s ½) –1 configuration. In addition, the structures above the ½ + state in 203At and 197At are studied using in-beam γ-ray spectroscopy, recoil-decay tagging, and recoil-isomer decay tagging methods. As a result, the ½ + state is fed from 3/2 + and 5/2 + states, and the origin of these states are discussed.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2] ;  [2] ;  [2] ;  [5] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] more »;  [2] ;  [2] ;  [2] ;  [2] ;  [2] « less
  1. Univ. of Jyvaskyla (Finland); Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Univ. of Jyvaskyla (Finland)
  3. Univ. of Jyvaskyla (Finland); Univ. of Liverpool, Liverpool (United Kingdom)
  4. Royal Institute of Technology, Stockholm (Sweden); Univ. of Helsinki (Finland)
  5. The Univ. of Manchester, Manchester (United Kingdom)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
European Commission, Community Research and Development Information Service (CORDIS), Seventh Framework Programme (FP7); Academy of Finland, Centre of Excellence; 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:
1368565
Alternate Identifier(s):
OSTI ID: 1351042