Near-yrast structure of {sup 142}Cs and {sup 144}Cs

Journal Article · Tue Dec 15 04:00:00 EST 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.064317· OSTI ID:21296582

RzaPca-Urban, T; Sadowski, M P ^[1]; Genevey, J; Pinston, J A ^[2]; Materna, T; Koester, U; Faust, H ^[3]; Urban, W ^[1]; Smith, A G ^[4]; Simpson, G S ^[2]; Bail, A; Mathieu, L; Serot, O ^[5]; Michel-Sendis, F ^[6]; Ahmad, I ^[7]

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1. Faculty of Physics, University of Warsaw, ulica Hoza 69, PL-00681 Warsaw (Poland)
2. LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex (France)
3. Institut Laue-Langevin, 6 rue J. Horowitz, F-38042 Grenoble Cedex 9 (France)
4. Department of Physics and Astronomy, The University of Manchester, M13 9PL Manchester (United Kingdom)
5. CEA Cadarache, F-13108 Saint Paul-lez-Durance (France)
6. CEA Saclay, F-91191 Gif-sur-Yvette (France)
7. Argonne National Laboratory, Argonne, Illinois 60439 (United States)

Excited states in {sup 142}Cs and {sup 144}Cs, populated in the spontaneous fission of {sup 248}Cm and {sup 252}Cf and in thermal neutron-induced fission of {sup 235}U and {sup 242}Am were studied by means of {gamma} spectroscopy using the EUROGAM2 and Gammasphere multidetector Ge arrays and the LOHENGRIN fission-fragment separator, respectively. In {sup 142}Cs, a band and an isomer with a half-life of T{sub 1/2}=11(3) ns have been identified. Spins and parities have been proposed for excited levels in this nucleus. In {sup 144}Cs excited levels have been observed. A T{sub 1/2}=1.1(1) {mu}s isomer was found with a {gamma} cascade, which probably feeds this isomer. There is also an indication of a nanosecond isomer in {sup 144}Cs. Quasiparticle-rotor model calculations done in this work allowed proton-neutron configurations to be proposed for levels in {sup 142}Cs and {sup 144}Cs.

• OSTI ID: 21296582
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMERICIUM 242
CALIFORNIUM 252
CESIUM 142
CESIUM 144
CONFIGURATION
CURIUM 248
EXCITED STATES
FISSION FRAGMENTS
GAMMA SPECTROSCOPY
HALF-LIFE
ISOMERS
PARITY
PROTON-NEUTRON INTERACTIONS
PROTONS
SIMULATION
SPIN
SPONTANEOUS FISSION
THERMAL NEUTRONS
URANIUM 235
YRAST STATES