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Title: New lifetime measurements in Pd109 and the onset of deformation at N=60

We measured several new subnanosecond lifetimes in 109Pd using the fast-timing βγ γ (t ) method. Fission fragments of the A = 109 mass chain were produced by bombarding natural uranium with 30 MeV protons at the Jyväskylä Ion Guide Isotope Separator On-Line (IGISOL) facility. We obtained lifetimes for excited states in 109Pd populated following β decay of 109Rh. The new lifetimes provide some insight into the evolution of nuclear structure in this mass region. In particular, the distinct structure of the two low-lying 7/2+ states occurring systematically across the Pd isotopic chain is supported by the new lifetime measurements. Finally, the available nuclear data indicate a sudden increase in deformation at N = 60 which is related to the strong p-n interaction between πg9/2 and νg7/2 valence nucleons expected in this region.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [5] ;  [9] ;  [5] ;  [7] ;  [5] ;  [5] ;  [5] ;  [5] ;  [5] ;  [10] ;  [5] ;  [3] more »;  [5] « less
  1. Univ. of Notre Dame, IN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Notre Dame, IN (United States); National Centre for Nuclear Research, Warsaw (Poland)
  3. Univ. of Notre Dame, IN (United States)
  4. Univ. Joseph Fourier Grenoble (France). Inst. National Polytechnique de Grenoble, Lab. de Physique Subatomique & Cosmologie (LPSC)
  5. Univ. of Jyvaskyla (Finland)
  6. National Institute for Physics and Nuclear Engineering, Bucharest-Magurele (Romania)
  7. Univ. Complutense Madrid (Spain)
  8. Univ. of Warsaw (Poland)
  9. Univ. of Notre Dame, IN (United States); Saint Mary's College, Notre Dame, IN (United States)
  10. National Centre for Nuclear Research, Warsaw (Poland)
Publication Date:
OSTI Identifier:
1240968
Report Number(s):
LLNL-JRNL--677600
Journal ID: ISSN 0556-2813; PRVCAN
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 6; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS