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Title: Core excitations across the neutron shell gap in 207Tl

The single closed-neutron-shell, one proton–hole nucleus 207Tl was populated in deep-inelastic collisions of a 208Pb beam with a 208Pb target. The yrast and near-yrast level scheme has been established up to high excitation energy, comprising an octupole phonon state and a large number of core excited states. Based on shell-model calculations, all observed single core excitations were established to arise from the breaking of the N=126 neutron core. While the shell-model calculations correctly predict the ordering of these states, their energies are compressed at high spins. It is concluded that this compression is an intrinsic feature of shell-model calculations using two-body matrix elements developed for the description of two-body states, and that multiple core excitations need to be considered in order to accurately calculate the energy spacings of the predominantly three-quasiparticle states.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [6] ;  [2] ;  [8] ;  [2] ;  [6] ;  [9] ;  [10] ;  [11] ;  [6] ;  [2] ;  [6] ;  [11] ;  [6] more »;  [12] ;  [13] ;  [12] ;  [14] ;  [6] ;  [7] ;  [2] « less
  1. Univ. of Surrey, Guildford (United Kingdom); Univ. of Richmond, Richmond, VA (United States)
  2. Univ. of Surrey, Guildford (United Kingdom)
  3. GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. Univ. of Maryland, College Park, MD (United States); Argonne National Lab. (ANL), Argonne, IL (United States); U. S. Army Research Lab., Adelphi, MD (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. H. Niewodniczanski Institute of Nuclear Physics, Krakow (Poland)
  8. Univ. of Surrey, Guildford (United Kingdom); Michigan State Univ., East Lansing, MI (United States)
  9. H. Niewodniczanski Institute of Nuclear Physics, Krakow (Poland); Univ. degli Studi Milano, Milan (Italy)
  10. Univ. of Massachusetts, Lowell, MA (United States); Indian Institute of Technology Roorkee, Roorkee (India)
  11. Australian National Univ., Canberra, ACT (Australia)
  12. Univ. of Surrey, Guildford (United Kingdom); National Physical Lab., Middlesex (United Kingdom)
  13. Univ. of Surrey, Guildford (United Kingdom); Australian National Univ., Australian Capital Territory (Australia)
  14. Univ. of Brighton, Brighton (United Kingdom)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; FG02-94ER40834
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 747; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
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:
1198546
Alternate Identifier(s):
OSTI ID: 1208910