Band properties of the transitional nucleus {sup 187}Pt

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.034314· OSTI ID:20995127

Zhou, X H; Xing, Y B ^[1]; Liu, M L; Zhang, Y H; Guo, Y X; Ma, L; Lei, X G; Guo, W T ^[1]; Oshima, M; Toh, Y; Koizumi, M; Osa, A; Hatsukawa, Y; Xu, F R; Sugawara, M ^[2]

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1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China)
2. Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)

High-spin states in {sup 187}Pt have been studied experimentally using the {sup 173}Yb({sup 18}O, 4n) reaction at beam energies of 78 and 85 MeV. The previously known bands based on the {nu}i{sub 13/2},{nu}7/2{sup -}[503], and {nu}i{sub 13/2}{sup 2}{nu}j configurations have been extended to high-spin states, and new rotational bands associated with the {nu}3/2{sup -}[512] and {nu}1/2{sup -}[521] Nilsson orbits have been identified. The total Routhian surface calculations indicate that the transitional nucleus {sup 187}Pt is very soft with respect to {beta} and {gamma} deformations. The band properties, such as level spacings, band crossing frequencies, alignment gains, and signature splittings, have been compared with the systematics observed in neighboring nuclei and have been interpreted within the framework of the cranked shell model. The rotational bands show different band crossing frequencies, which can be explained by the alignment either of i{sub 13/2} neutrons or of h{sub 9/2} protons. Importantly, evidence is presented for a {pi}h{sub 9/2} alignment at very low frequency in the {nu}7/2{sup -}[503] band. The proton nature of the band crossing is strongly suggested by comparing the measured B(M1;I{yields}I-1)/B(E2;I{yields}I-2) ratios with the theoretical values from the semiclassical Doenau and Frauendof approach.

• OSTI ID: 20995127
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
HIGH SPIN STATES
MEV RANGE 10-100
NEUTRONS
OXYGEN 18
PLATINUM 187
PROTONS
ROTATIONAL STATES
SEMICLASSICAL APPROXIMATION
SHELL MODELS
YTTERBIUM 173