Identification and shell model calculation of high spin states in {sup 137,138}Cs nuclei
- Physics Department, Vanderbilt University, Nashville, Tennessee 37235 (United States)
- Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
- 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)
- Unversidade Federal do Rio de Janeiro, CP 68528, RG (Brazil)
- Flerov Laboratory for Nuclear Reactions, JINR, Dubna (Russian Federation)
- Idaho National Laboratory, Bldg. IRCPL, MS2114, Idaho Falls, Idaho 83415 (United States)
- Mississippi State University, Drawer 5167, Mississippi State, Mississippi 39762 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
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.
- OSTI ID:
- 20995207
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 75, Issue 4; Other Information: DOI: 10.1103/PhysRevC.75.044314; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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