Spherical and deformed structures in {sup 189}Pb

• Published in: Physical review. C, Nuclear physics Nuclear physics, 2005-05, Vol.71 (5)
• Main Authors: Baxter, A.M., Byrne, A.P., Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra ACT 0200, Dracoulis, G.D., Davidson, P.M., Kibedi, T., Janssens, R.V.F., Carpenter, M.P., Davids, C.N., Khoo, T.L., Lauritsen, T.
• Format: Article
• Language: English
• Subjects: 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 PHYSICS AND RADIATION PHYSICS; NUCLEAR STRUCTURE; PARITY; SILICON 29 REACTIONS; SPIN
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PhysRevC.71.054302

{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.