In-Beam {gamma}-Spectroscopy of Low-Spin Mixed-Symmetry States of 138Ce with Gammasphere in Singles-Mode

Journal Article · Mon Mar 13 04:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2187828· OSTI ID:20798273

Pietralla, N; Rainovski, G; Ahn, T ^[1]; Carpenter, M P; Janssens, R V. F.; Lister, C J; Zhu, S ^[2]

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1. NSL, SUNY at Stony Brook, NY 11794-3800 (United States)
2. Physics Division, Argonne National Laboratory, Argonne, IL 60439 (United States)

Gamma-rays from the nuclide 138Ce have been measured with the Gammasphere-array following Coulomb excitation. Beams of 138Ce ions were focussed on a carbon target at beam energies of 480 and 400 MeV. Gamma-ray yields and relative Coulomb excitation cross sections were measured in singles-mode. M1, E2, and E3 transition matrix elements from low-spin states were measured relative to the known B(E2; 0{sub 1}{sup +} {yields} 2{sub 1}{sup +}). The 2{sup +} {yields} 2{sub 1}{sup +} M1 strength distribution from the lowest six 2+ states up to 2.7 MeV enables us to identify the 2{sub 4}{sup +} state of 138Ce as the dominant fragment of the one-phonon 2{sub 1,ms}{sup +} mixed-symmetry state with F-spin quantum number Fmax - 1. From its mixing with the nearby 2{sub 3}{sup +} state an F-spin mixing matrix element of 44 keV can be estimated.

• OSTI ID: 20798273
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 819; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CARBON 12 TARGET
CERIUM 138
COULOMB EXCITATION
CROSS SECTIONS
DISTRIBUTION
E2-TRANSITIONS
E3-TRANSITIONS
GAMMA RADIATION
GAMMA SPECTROSCOPY
ION BEAMS
KEV RANGE
M1-TRANSITIONS
MATRIX ELEMENTS
MEV RANGE
NUCLEAR REACTION YIELD
PHONONS
SPIN