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Title: Band properties of the transitional nucleus {sup 187}Pt

Abstract

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.

Authors:
;  [1];  [2]; ; ; ; ; ;  [1]; ; ; ; ; ; ;  [3];  [2];  [4]
  1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China)
  2. (China)
  3. Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)
  4. (Japan)
Publication Date:
OSTI Identifier:
20995127
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.75.034314; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Zhou, X. H., Xing, Y. B., Graduate School of the Chinese Academy of Sciences, Beijing 100049, Liu, M. L., Zhang, Y. H., Guo, Y. X., Ma, L., Lei, X. G., Guo, W. T., Oshima, M., Toh, Y., Koizumi, M., Osa, A., Hatsukawa, Y., Xu, F. R., Sugawara, M., Department of Technical Physics and MOE Key Laboratory, Peking University, Beijing 100871, and Chiba Institute of Technology, Narashino, Chiba 275-0023. Band properties of the transitional nucleus {sup 187}Pt. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.034314.
Zhou, X. H., Xing, Y. B., Graduate School of the Chinese Academy of Sciences, Beijing 100049, Liu, M. L., Zhang, Y. H., Guo, Y. X., Ma, L., Lei, X. G., Guo, W. T., Oshima, M., Toh, Y., Koizumi, M., Osa, A., Hatsukawa, Y., Xu, F. R., Sugawara, M., Department of Technical Physics and MOE Key Laboratory, Peking University, Beijing 100871, & Chiba Institute of Technology, Narashino, Chiba 275-0023. Band properties of the transitional nucleus {sup 187}Pt. United States. doi:10.1103/PHYSREVC.75.034314.
Zhou, X. H., Xing, Y. B., Graduate School of the Chinese Academy of Sciences, Beijing 100049, Liu, M. L., Zhang, Y. H., Guo, Y. X., Ma, L., Lei, X. G., Guo, W. T., Oshima, M., Toh, Y., Koizumi, M., Osa, A., Hatsukawa, Y., Xu, F. R., Sugawara, M., Department of Technical Physics and MOE Key Laboratory, Peking University, Beijing 100871, and Chiba Institute of Technology, Narashino, Chiba 275-0023. Thu . "Band properties of the transitional nucleus {sup 187}Pt". United States. doi:10.1103/PHYSREVC.75.034314.
@article{osti_20995127,
title = {Band properties of the transitional nucleus {sup 187}Pt},
author = {Zhou, X. H. and Xing, Y. B. and Graduate School of the Chinese Academy of Sciences, Beijing 100049 and Liu, M. L. and Zhang, Y. H. and Guo, Y. X. and Ma, L. and Lei, X. G. and Guo, W. T. and Oshima, M. and Toh, Y. and Koizumi, M. and Osa, A. and Hatsukawa, Y. and Xu, F. R. and Sugawara, M. and Department of Technical Physics and MOE Key Laboratory, Peking University, Beijing 100871 and Chiba Institute of Technology, Narashino, Chiba 275-0023},
abstractNote = {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.},
doi = {10.1103/PHYSREVC.75.034314},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}