Decay of Neutron-Rich Mn Nuclides and Deformation of Heavy Fe Isotopes
- Institut fuer Kernchemie, Universitaet Mainz, D-55099 Mainz (Germany)
- Instituut voor Kern- en Strahlingsfysica, University of Leuven, B-3001 Leuven (Belgium)
- Department of Chemistry, University of Maryland, College Park, Maryland 20742 (United States)
- Institute of Spectroscopy, Russian Academy of Sciences, RUS-142092 Troitzk (Russia)
- Institut fuer Physik, Universitaet Mainz, D-55099 Mainz (Germany)
- Physik-Department, TU Muenchen, D-85748 Garching (Germany)
The use of chemically selective laser ionization combined with {beta} -delayed neutron counting at CERN/ISOLDE has permitted identification and half-life measurements for 623-ms {sup 61}Mn up through 14-ms {sup 69}Mn . The measured half-lives are found to be significantly longer near N=40 than the values calculated with a quasiparticle random-phase-approximation shell model. Gamma-ray singles and coincidence spectroscopy has been performed for {sup 64,66}Mn decays to levels of {sup 64,66}Fe , revealing a significant drop in the energy of the first 2{sup +} state in these nuclides that suggests an unanticipated increase in collectivity near N=40 . {copyright} {ital 1999} {ital The American Physical Society }
- OSTI ID:
- 321539
- Journal Information:
- Physical Review Letters, Vol. 82, Issue 7; Other Information: PBD: Feb 1999
- Country of Publication:
- United States
- Language:
- English
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