New lifetime measurements in and the onset of deformation at
Abstract
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:
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- Univ. of Notre Dame, IN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Notre Dame, IN (United States); National Centre for Nuclear Research, Warsaw (Poland)
- Univ. of Notre Dame, IN (United States)
- Univ. Joseph Fourier Grenoble (France). Inst. National Polytechnique de Grenoble, Lab. de Physique Subatomique & Cosmologie (LPSC)
- Univ. of Jyvaskyla (Finland)
- National Institute for Physics and Nuclear Engineering, Bucharest-Magurele (Romania)
- Univ. Complutense Madrid (Spain)
- Univ. of Warsaw (Poland)
- Univ. of Notre Dame, IN (United States); Saint Mary's College, Notre Dame, IN (United States)
- National Centre for Nuclear Research, Warsaw (Poland)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1240968
- Alternate Identifier(s):
- OSTI ID: 1229581
- Report Number(s):
- LLNL-JRNL-677600
Journal ID: ISSN 0556-2813; PRVCAN
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Journal Article: 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)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
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., 2015.
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. https://doi.org/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. https://doi.org/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},
url = {https://www.osti.gov/biblio/1240968},
journal = {Physical Review C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 92,
place = {United States},
year = {Mon Dec 14 00:00:00 EST 2015},
month = {Mon Dec 14 00:00:00 EST 2015}
}
Web of Science
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