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

Journal Article · Sun Apr 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.044314· OSTI ID:20995207

Li, K; Hwang, J K; Ramayya, A V; Hamilton, J H; Goodin, C; Crowell, H L ^[1]; Luo, Y X ^[1]; Zhu, S J ^[1]; Rasmussen, J O; Lee, I Y; Wu, S C ^[2]; Covello, A; Gargano, A ^[3]; Donangelo, R ^[4]; Ter-Akopian, G M; Daniel, A V ^[5]; Cole, J D ^[6]; Ma, W C ^[7]; Stoyer, M A ^[8]

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1. Physics Department, Vanderbilt University, Nashville, Tennessee 37235 (United States)
2. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
3. 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)
4. Unversidade Federal do Rio de Janeiro, CP 68528, RG (Brazil)
5. Flerov Laboratory for Nuclear Reactions, JINR, Dubna (Russian Federation)
6. Idaho National Laboratory, Bldg. IRCPL, MS2114, Idaho Falls, Idaho 83415 (United States)
7. Mississippi State University, Drawer 5167, Mississippi State, Mississippi 39762 (United States)
8. 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, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

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