Identification of yrast states in {sup 187}Pb
- Department of Physics and Theoretical Physics, Faculty of Science, Australian National University, Canberra ACT 0200 (Australia)
- Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra ACT 0200 (Australia)
- Physics Department, University of Surrey, Guildford GU2 5XH (United Kingdom)
- Physics Department, University of Jyvaeskylae, P.O. Box 35, FIN-40351 Jyvaeskylae (Finland)
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
{gamma}-ray spectroscopy of the high-spin states of the neutron-deficient nucleus {sup 187}Pb has been conducted with the {sup 155}Gd({sup 36}Ar,4n) reaction. A cascade of three transitions was deduced from {gamma}-{gamma} coincidence data gated by detection of recoiling evaporation residues in a gas-filled recoil separator. In an earlier, separate experiment, two of these {gamma} rays were positively identified with {sup 187}Pb by recoil-{gamma} coincidence measurements with a high-resolution, recoil mass spectrometer. From comparison with similar sequences in heavier odd-A lead isotopes, the cascade in {sup 187}Pb is associated with the sequence of three E2 transitions from the yrast (25) /(2) {sup +} level to a low-lying (13) /(2) {sup +} isomer. The variation of excitation energy with mass number of the levels concerned suggests that their structure can be associated with weak coupling of an odd i{sub 13/2} neutron to states in the spherical well. However, the possibility that they are influenced by mixing with states in the prolate-deformed well cannot be discounted. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 663756
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 58; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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