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Title: High-spin level structure of {sup 115}Rh: Evolution of triaxiality in odd-even Rh isotopes

Abstract

High-spin excited states in the neutron-rich nucleus {sup 115}Rh have been identified for the first time by studying prompt {gamma} rays from the spontaneous fission of {sup 252}Cf with the Gammasphere detector array. A new yrast band and a sideband are built in {sup 115}Rh. This level scheme is proposed to be built on the 7/2{sup +} ground state. The existence of a large signature splitting and an yrare band in {sup 115}Rh shows typical features of a triaxially deformed nucleus. The rigid triaxial rotor plus particle model is used to interpret the level structure of {sup 115}Rh. The level energies, the {gamma} branching ratios, the large signature splitting in the yrast band, and the inverted signature splitting in the yrare band in {sup 115}Rh are reproduced very well. Strong K mixing occurs in {sup 115}Rh at high spin.

Authors:
 [1];  [2]; ; ; ;  [1];  [3]; ; ;  [4];  [1];  [2];  [5];  [6];  [1];  [7]; ;  [8]
  1. Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States)
  2. (United States)
  3. Institut fuer Kernphysik, Universitaet zu Koeln, D-50937 Cologne (Germany)
  4. Department of Physics, Tsinghua University, Beijing 100084 (China)
  5. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  6. Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762 (United States)
  7. (Russian Federation)
  8. Joint Institute for Nuclear Research, RU-141980 Dubna (Russian Federation)
Publication Date:
OSTI Identifier:
21596550
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.84.014304; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BRANCHING RATIO; CALIFORNIUM 252; DEFORMED NUCLEI; ENERGY LEVELS; EVOLUTION; EXCITED STATES; GAMMA RADIATION; GAMMA SOURCES; GROUND STATES; MIXING; NEUTRON-RICH ISOTOPES; RHODIUM 115; SPIN; SPONTANEOUS FISSION; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; ANGULAR MOMENTUM; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CALIFORNIUM ISOTOPES; DECAY; DIMENSIONLESS NUMBERS; ELECTROMAGNETIC RADIATION; EVEN-EVEN NUCLEI; FISSION; HEAVY NUCLEI; INTERMEDIATE MASS NUCLEI; IONIZING RADIATIONS; ISOTOPES; MILLISECONDS LIVING RADIOISOTOPES; NUCLEAR DECAY; NUCLEAR REACTIONS; NUCLEI; ODD-EVEN NUCLEI; PARTICLE PROPERTIES; RADIATION SOURCES; RADIATIONS; RADIOISOTOPES; RHODIUM ISOTOPES; SPONTANEOUS FISSION RADIOISOTOPES; YEARS LIVING RADIOISOTOPES

Citation Formats

Liu, S. H., UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, Hamilton, J. H., Ramayya, A. V., Brewer, N. T., Hwang, J. K., Gelberg, A., Gu, L., Yeoh, E. Y., Zhu, S. J., Luo, Y. X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Rasmussen, J. O., Ma, W. C., Daniel, A. V., Joint Institute for Nuclear Research, RU-141980 Dubna, Oganessian, Yu. Ts., and Ter-Akopian, G. M.. High-spin level structure of {sup 115}Rh: Evolution of triaxiality in odd-even Rh isotopes. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.014304.
Liu, S. H., UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, Hamilton, J. H., Ramayya, A. V., Brewer, N. T., Hwang, J. K., Gelberg, A., Gu, L., Yeoh, E. Y., Zhu, S. J., Luo, Y. X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Rasmussen, J. O., Ma, W. C., Daniel, A. V., Joint Institute for Nuclear Research, RU-141980 Dubna, Oganessian, Yu. Ts., & Ter-Akopian, G. M.. High-spin level structure of {sup 115}Rh: Evolution of triaxiality in odd-even Rh isotopes. United States. doi:10.1103/PHYSREVC.84.014304.
Liu, S. H., UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, Hamilton, J. H., Ramayya, A. V., Brewer, N. T., Hwang, J. K., Gelberg, A., Gu, L., Yeoh, E. Y., Zhu, S. J., Luo, Y. X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Rasmussen, J. O., Ma, W. C., Daniel, A. V., Joint Institute for Nuclear Research, RU-141980 Dubna, Oganessian, Yu. Ts., and Ter-Akopian, G. M.. Fri . "High-spin level structure of {sup 115}Rh: Evolution of triaxiality in odd-even Rh isotopes". United States. doi:10.1103/PHYSREVC.84.014304.
@article{osti_21596550,
title = {High-spin level structure of {sup 115}Rh: Evolution of triaxiality in odd-even Rh isotopes},
author = {Liu, S. H. and UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831 and Hamilton, J. H. and Ramayya, A. V. and Brewer, N. T. and Hwang, J. K. and Gelberg, A. and Gu, L. and Yeoh, E. Y. and Zhu, S. J. and Luo, Y. X. and Lawrence Berkeley National Laboratory, Berkeley, California 94720 and Rasmussen, J. O. and Ma, W. C. and Daniel, A. V. and Joint Institute for Nuclear Research, RU-141980 Dubna and Oganessian, Yu. Ts. and Ter-Akopian, G. M.},
abstractNote = {High-spin excited states in the neutron-rich nucleus {sup 115}Rh have been identified for the first time by studying prompt {gamma} rays from the spontaneous fission of {sup 252}Cf with the Gammasphere detector array. A new yrast band and a sideband are built in {sup 115}Rh. This level scheme is proposed to be built on the 7/2{sup +} ground state. The existence of a large signature splitting and an yrare band in {sup 115}Rh shows typical features of a triaxially deformed nucleus. The rigid triaxial rotor plus particle model is used to interpret the level structure of {sup 115}Rh. The level energies, the {gamma} branching ratios, the large signature splitting in the yrast band, and the inverted signature splitting in the yrare band in {sup 115}Rh are reproduced very well. Strong K mixing occurs in {sup 115}Rh at high spin.},
doi = {10.1103/PHYSREVC.84.014304},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}