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Title: New lifetime measurements in Pd 109 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 πg 9/2 and νg 7/2 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:
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 Lab. (LLNL), Livermore, CA (United States)
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
OSTI Identifier:
1240968
Alternate Identifier(s):
OSTI ID: 1229581

Bucher, B., Mach, H., Aprahamian, A., Simpson, G. S., Rissanen, J., Ghiţă, D. G., Olaizola, B., Kurcewicz, W., Äystö, J., Bentley, I., Eronen, T., Fraile, L. M., Jokinen, A., Karvonen, P., Moore, I. D., Penttilä, H., Reponen, M., Ruchowska, E., Saastamoinen, A., Smith, M. K., and Weber, C.. New lifetime measurements in Pd109 and the onset of deformation at N=60. United States: N. p., Web. doi:10.1103/PhysRevC.92.064312.
Bucher, B., Mach, H., Aprahamian, A., Simpson, G. S., Rissanen, J., Ghiţă, D. G., Olaizola, B., Kurcewicz, W., Äystö, J., Bentley, I., Eronen, T., Fraile, L. M., Jokinen, A., Karvonen, P., Moore, I. D., Penttilä, H., Reponen, M., Ruchowska, E., Saastamoinen, A., Smith, M. K., & Weber, C.. New lifetime measurements in Pd109 and the onset of deformation at N=60. United States. doi:10.1103/PhysRevC.92.064312.
Bucher, B., Mach, H., Aprahamian, A., Simpson, G. S., Rissanen, J., Ghiţă, D. G., Olaizola, B., Kurcewicz, W., Äystö, J., Bentley, I., Eronen, T., Fraile, L. M., Jokinen, A., Karvonen, P., Moore, I. D., Penttilä, H., Reponen, M., Ruchowska, E., Saastamoinen, A., Smith, M. K., and Weber, C.. 2015. "New lifetime measurements in Pd109 and the onset of deformation at N=60". United States. doi:10.1103/PhysRevC.92.064312. https://www.osti.gov/servlets/purl/1240968.
@article{osti_1240968,
title = {New lifetime measurements in Pd109 and the onset of deformation at N=60},
author = {Bucher, B. and Mach, H. and Aprahamian, A. and Simpson, G. S. and Rissanen, J. and Ghiţă, D. G. and Olaizola, B. and Kurcewicz, W. and Äystö, J. and Bentley, I. and Eronen, T. and Fraile, L. M. and Jokinen, A. and Karvonen, P. and Moore, I. D. and Penttilä, H. and Reponen, M. and Ruchowska, E. and Saastamoinen, A. and Smith, M. K. and Weber, C.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.92.064312},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 92,
place = {United States},
year = {2015},
month = {12}
}