Spherical and deformed structures in {sup 189}Pb

Journal Article · Sun May 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.054302· OSTI ID:20698652

Baxter, A M ^[1]; Byrne, A P ^[1]; Dracoulis, G D; Davidson, P M; Kibedi, T ^[2]; Janssens, R V.F.; Carpenter, M P; Davids, C N; Khoo, T L; Lauritsen, T ^[3]

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1. Department of Physics, Faculty of Science, Australian National University, Canberra ACT 0200 (Australia)
2. Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra ACT 0200 (Australia)
3. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

{gamma}-ray spectroscopy of high-spin states of the neutron-deficient nucleus {sup 189}Pb has been conducted with the {sup 158}Gd({sup 36}Ar,5n) and {sup 164}Er({sup 29}Si,4n) reactions. With the first of these, detection of evaporation residues and mass gating were used to unambiguously assign a number of prompt {gamma}-ray transitions to {sup 189}Pb. With the second reaction and a pulsed beam, an isomer with a mean life of 32 {mu}s was found. Although inconclusive, the available evidence favors identification of the isomer with the (33/2){sup +} state of the {nu}(i{sub 13/2}){sup -3} configuration. The levels observed below the isomer can be identified with states involving three different structures: the neutron (i{sub 13/2}){sup -3} multiplet in the spherical well; a prolate-deformed band involving mixed i{sub 13/2} neutron orbitals; and a state with the oblate {pi}(2p-2h){sub 0{sup +}}x{nu}(i{sub 13/2}){sup -1} configuration. The evidence for structures associated with different shapes is supported by the observation of E0 components in some of the J{sup {pi}}{yields}J{sup {pi}} transitions linking them.

• OSTI ID: 20698652
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARGON 36 REACTIONS
DEFORMED NUCLEI
ENERGY-LEVEL TRANSITIONS
ERBIUM 164 TARGET
EVAPORATION MODEL
GADOLINIUM 158 TARGET
GAMMA RADIATION
GAMMA SPECTRA
GAMMA SPECTROSCOPY
HEAVY ION FUSION REACTIONS
HIGH SPIN STATES
LEAD 189
LIFETIME
NEUTRON-DEFICIENT ISOTOPES
NEUTRONS
NUCLEAR STRUCTURE
PARITY
SILICON 29 REACTIONS
SPIN