{gamma}-ray multipolarimetry between low-spin states of {sup 136}Ce: Search for the 2{sub 1,ms}{sup +} one-phonon mixed-symmetry state

Journal Article · Mon Jan 15 04:00:00 EST 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.014313· OSTI ID:20990952

Ahn, T; Pietralla, N; Costin, A ^[1]; Rainovski, G ^[1]; Dusling, K; Li, T C; Pontillo, S ^[1]; Linnemann, A ^[2]

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1. Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800 (United States)
2. Institut fuer Kernphysik, Universitaet zu Koeln, D-50937 Koeln (Germany)

An experiment was performed on {sup 136}Ce to measure E2/M1 multipole mixing ratios using the method of {gamma}{gamma} angular correlations. The low-spin states of interest were populated by {beta} decay from the 2{sup +} ground state of {sup 136}Pr that has a half-life of 13.1 min. Emitted {gamma} rays were detected with the Stony Brook cube germanium detector array. Five E2/M1 multipole mixing ratios were measured for the first time and two spin and parity quantum numbers were assigned. Candidates for the 2{sub 1,ms}{sup +} state of {sup 136}Ce were identified from large M1 fractions in the E2/M1 multipole mixing ratios. The 2{sub 1,ms}{sup +} state is suggested to be fragmented between the closely lying 2{sub 3}{sup +} and 2{sub 4}{sup +} states. A two state mixing scenario is employed for deducing an F-spin mixing matrix element of 43(5) keV.

• OSTI ID: 20990952
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
BETA DECAY
CERIUM 136
GAMMA RADIATION
GE SEMICONDUCTOR DETECTORS
GROUND STATES
HALF-LIFE
KEV RANGE 10-100
MATRIX ELEMENTS
MIXING
MIXING RATIO
PARITY
PHONONS
PRASEODYMIUM 136
QUANTUM NUMBERS
SPIN
SYMMETRY