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Title: Identification and shell model calculation of high spin states in {sup 137,138}Cs nuclei

Abstract

High spin states of {sup 137,138}Cs have been studied by measuring {gamma}-{gamma}-{gamma} coincidences from the spontaneous fission of {sup 252}Cf with the LBNL Gammasphere detector array. The high spin level scheme of the N=83 neutron-rich Cs (Z=55) isotope, {sup 138}Cs, built on the 6{sup -} isomeric state, has been established for the first time up to a 4626 keV level, assigned (16{sup +}). The level scheme of {sup 137}Cs has been expanded up to a 5495 keV level, assigned (31/2{sup -}). Spins, parities, and configurations are assigned based on the agreement between experimental level energies and shell model calculations and level systematics. Similarities are observed in the N=82 isotones, {sup 137}Cs and {sup 135}I, up to 17/2{sup +} as well as in the N=83 isotones, {sup 138}Cs and {sup 136}I, up to 12{sup -}. The shell model calculations indicate the important role played by interactions between the excitation of the valence protons outside the Z=50 major shell and the f{sub 7/2} valence neutron outside the N=82 major shell.

Authors:
; ; ; ; ;  [1];  [1];  [2];  [1];  [3]; ; ;  [4]; ;  [5];  [6]; ;  [7];  [8];  [9] more »;  [10] « less
  1. Physics Department, Vanderbilt University, Nashville, Tennessee 37235 (United States)
  2. (United States)
  3. (China)
  4. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  5. Dipartimento di Scienze Fisiche, Universita di Napoli Federico II, and Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, Via Cintia, 80126 Naples (Italy)
  6. Unversidade Federal do Rio de Janeiro, CP 68528, RG (Brazil)
  7. Flerov Laboratory for Nuclear Reactions, JINR, Dubna (Russian Federation)
  8. Idaho National Laboratory, Bldg. IRCPL, MS2114, Idaho Falls, Idaho 83415 (United States)
  9. Mississippi State University, Drawer 5167, Mississippi State, Mississippi 39762 (United States)
  10. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
20995207
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.75.044314; (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; CALIFORNIUM 252; CESIUM 137; CESIUM 138; EXCITATION; HIGH SPIN STATES; IODINE 135; IODINE 136; ISOTONIC NUCLEI; KEV RANGE; NEUTRONS; PARITY; PROTONS; SHELL MODELS; SPIN; SPONTANEOUS FISSION

Citation Formats

Li, K., Hwang, J. K., Ramayya, A. V., Hamilton, J. H., Goodin, C., Crowell, H. L., Luo, Y. X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Zhu, S. J., Physics Department, Tsinghua University, Beijing 100084, Rasmussen, J. O., Lee, I. Y., Wu, S. C., Covello, A., Gargano, A., Donangelo, R., Ter-Akopian, G. M., Daniel, A. V., Cole, J. D., Ma, W. C., and Stoyer, M. A.. Identification and shell model calculation of high spin states in {sup 137,138}Cs nuclei. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.044314.
Li, K., Hwang, J. K., Ramayya, A. V., Hamilton, J. H., Goodin, C., Crowell, H. L., Luo, Y. X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Zhu, S. J., Physics Department, Tsinghua University, Beijing 100084, Rasmussen, J. O., Lee, I. Y., Wu, S. C., Covello, A., Gargano, A., Donangelo, R., Ter-Akopian, G. M., Daniel, A. V., Cole, J. D., Ma, W. C., & Stoyer, M. A.. Identification and shell model calculation of high spin states in {sup 137,138}Cs nuclei. United States. doi:10.1103/PHYSREVC.75.044314.
Li, K., Hwang, J. K., Ramayya, A. V., Hamilton, J. H., Goodin, C., Crowell, H. L., Luo, Y. X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Zhu, S. J., Physics Department, Tsinghua University, Beijing 100084, Rasmussen, J. O., Lee, I. Y., Wu, S. C., Covello, A., Gargano, A., Donangelo, R., Ter-Akopian, G. M., Daniel, A. V., Cole, J. D., Ma, W. C., and Stoyer, M. A.. Sun . "Identification and shell model calculation of high spin states in {sup 137,138}Cs nuclei". United States. doi:10.1103/PHYSREVC.75.044314.
@article{osti_20995207,
title = {Identification and shell model calculation of high spin states in {sup 137,138}Cs nuclei},
author = {Li, K. and Hwang, J. K. and Ramayya, A. V. and Hamilton, J. H. and Goodin, C. and Crowell, H. L. and Luo, Y. X. and Lawrence Berkeley National Laboratory, Berkeley, California 94720 and Zhu, S. J. and Physics Department, Tsinghua University, Beijing 100084 and Rasmussen, J. O. and Lee, I. Y. and Wu, S. C. and Covello, A. and Gargano, A. and Donangelo, R. and Ter-Akopian, G. M. and Daniel, A. V. and Cole, J. D. and Ma, W. C. and Stoyer, M. A.},
abstractNote = {High spin states of {sup 137,138}Cs have been studied by measuring {gamma}-{gamma}-{gamma} coincidences from the spontaneous fission of {sup 252}Cf with the LBNL Gammasphere detector array. The high spin level scheme of the N=83 neutron-rich Cs (Z=55) isotope, {sup 138}Cs, built on the 6{sup -} isomeric state, has been established for the first time up to a 4626 keV level, assigned (16{sup +}). The level scheme of {sup 137}Cs has been expanded up to a 5495 keV level, assigned (31/2{sup -}). Spins, parities, and configurations are assigned based on the agreement between experimental level energies and shell model calculations and level systematics. Similarities are observed in the N=82 isotones, {sup 137}Cs and {sup 135}I, up to 17/2{sup +} as well as in the N=83 isotones, {sup 138}Cs and {sup 136}I, up to 12{sup -}. The shell model calculations indicate the important role played by interactions between the excitation of the valence protons outside the Z=50 major shell and the f{sub 7/2} valence neutron outside the N=82 major shell.},
doi = {10.1103/PHYSREVC.75.044314},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}