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Title: Signature inversion in odd-odd {sup 114}Rh: First identification of high-spin states in very neutron-rich {sup 114}Rh and application of the triaxial projected shell model

Abstract

High-spin excited states in the very neutron-rich nucleus {sup 114}Rh have been studied by examining the prompt {gamma} rays emitted in the spontaneous fission of {sup 252}Cf with the Gammasphere detector array. A high-spin level scheme of {sup 114}Rh has been established for the first time with 13 new levels. The level scheme is proposed to be built on a 7{sup -} state. The existence of a relatively large signature splitting and an yrare band show features which may indicate triaxial deformation. The phenomenon of signature inversion has been observed in {sup 114}Rh at I=12 ({h_bar}/2{pi}). The observed signature inversion of {sup 114}Rh is interpreted successfully in terms of the triaxial projected shell model. Theoretical calculations suggest that the negative-parity, yrast band of {sup 114}Rh has the two-quasi-particle configuration of {pi}g{sub 9/2} x {nu}h{sub 11/2}, consistent with the systematics of odd-odd Rh isotopes. The signature inversion at spin 12 ({h_bar}/2{pi}) may be attributed to the change of rotational mode, from quasi-particle aligned rotation at low spins to collective rotation at high spins.

Authors:
 [1];  [2]; ; ; ;  [1]; ;  [3]; ; ;  [4];  [1];  [2];  [5];  [6];  [7];  [1];  [8]; ;  [9] more »;  [10] « less
  1. Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States)
  2. (United States)
  3. China Institute of Atomic Energy, P.O. Box 275(18), Beijing 102413 (China)
  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. UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831 (United States)
  8. (Russian Federation)
  9. Joint Institute for Nuclear Research, RU-141980 Dubna (Russian Federation)
  10. Institut fuer Kernphysik, Universitaet zu Koeln, DE-50937 Cologne (Germany)
Publication Date:
OSTI Identifier:
21502770
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 83; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.83.064310; (c) 2011 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CALIFORNIUM 252; CONFIGURATION; DEFORMATION; EXCITED STATES; GAMMA DETECTION; GAMMA RADIATION; HIGH SPIN STATES; NEUTRON-RICH ISOTOPES; NEUTRONS; ODD-ODD NUCLEI; QUASI PARTICLES; RHODIUM 114; ROTATION; SHELL MODELS; SPIN; SPONTANEOUS FISSION; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; ANGULAR MOMENTUM; BARYONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CALIFORNIUM ISOTOPES; DECAY; DETECTION; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ENERGY LEVELS; EVEN-EVEN NUCLEI; FERMIONS; FISSION; HADRONS; HEAVY NUCLEI; INTERMEDIATE MASS NUCLEI; IONIZING RADIATIONS; ISOTOPES; MATHEMATICAL MODELS; MOTION; NUCLEAR DECAY; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; NUCLEONS; PARTICLE PROPERTIES; RADIATION DETECTION; RADIATIONS; RADIOISOTOPES; RHODIUM ISOTOPES; SECONDS LIVING RADIOISOTOPES; 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., Chen, Y. S., Gao, Z. C., Zhu, S. J., Gu, L., Yeoh, E. Y., Luo, Y. X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Rasmussen, J. O., Ma, W. C., Batchelder, J. C., Daniel, A. V., Joint Institute for Nuclear Research, RU-141980 Dubna, Ter-Akopian, G. M., Oganessian, Yu. Ts., and Gelberg, A. Signature inversion in odd-odd {sup 114}Rh: First identification of high-spin states in very neutron-rich {sup 114}Rh and application of the triaxial projected shell model. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.83.064310.
Liu, S. H., UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, Hamilton, J. H., Ramayya, A. V., Brewer, N. T., Hwang, J. K., Chen, Y. S., Gao, Z. C., Zhu, S. J., Gu, L., Yeoh, E. Y., Luo, Y. X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Rasmussen, J. O., Ma, W. C., Batchelder, J. C., Daniel, A. V., Joint Institute for Nuclear Research, RU-141980 Dubna, Ter-Akopian, G. M., Oganessian, Yu. Ts., & Gelberg, A. Signature inversion in odd-odd {sup 114}Rh: First identification of high-spin states in very neutron-rich {sup 114}Rh and application of the triaxial projected shell model. United States. doi:10.1103/PHYSREVC.83.064310.
Liu, S. H., UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, Hamilton, J. H., Ramayya, A. V., Brewer, N. T., Hwang, J. K., Chen, Y. S., Gao, Z. C., Zhu, S. J., Gu, L., Yeoh, E. Y., Luo, Y. X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Rasmussen, J. O., Ma, W. C., Batchelder, J. C., Daniel, A. V., Joint Institute for Nuclear Research, RU-141980 Dubna, Ter-Akopian, G. M., Oganessian, Yu. Ts., and Gelberg, A. Wed . "Signature inversion in odd-odd {sup 114}Rh: First identification of high-spin states in very neutron-rich {sup 114}Rh and application of the triaxial projected shell model". United States. doi:10.1103/PHYSREVC.83.064310.
@article{osti_21502770,
title = {Signature inversion in odd-odd {sup 114}Rh: First identification of high-spin states in very neutron-rich {sup 114}Rh and application of the triaxial projected shell model},
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 Chen, Y. S. and Gao, Z. C. and Zhu, S. J. and Gu, L. and Yeoh, E. Y. and Luo, Y. X. and Lawrence Berkeley National Laboratory, Berkeley, California 94720 and Rasmussen, J. O. and Ma, W. C. and Batchelder, J. C. and Daniel, A. V. and Joint Institute for Nuclear Research, RU-141980 Dubna and Ter-Akopian, G. M. and Oganessian, Yu. Ts. and Gelberg, A.},
abstractNote = {High-spin excited states in the very neutron-rich nucleus {sup 114}Rh have been studied by examining the prompt {gamma} rays emitted in the spontaneous fission of {sup 252}Cf with the Gammasphere detector array. A high-spin level scheme of {sup 114}Rh has been established for the first time with 13 new levels. The level scheme is proposed to be built on a 7{sup -} state. The existence of a relatively large signature splitting and an yrare band show features which may indicate triaxial deformation. The phenomenon of signature inversion has been observed in {sup 114}Rh at I=12 ({h_bar}/2{pi}). The observed signature inversion of {sup 114}Rh is interpreted successfully in terms of the triaxial projected shell model. Theoretical calculations suggest that the negative-parity, yrast band of {sup 114}Rh has the two-quasi-particle configuration of {pi}g{sub 9/2} x {nu}h{sub 11/2}, consistent with the systematics of odd-odd Rh isotopes. The signature inversion at spin 12 ({h_bar}/2{pi}) may be attributed to the change of rotational mode, from quasi-particle aligned rotation at low spins to collective rotation at high spins.},
doi = {10.1103/PHYSREVC.83.064310},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 83,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2011},
month = {Wed Jun 15 00:00:00 EDT 2011}
}