Evidence for octupole correlations in Ba-124,Ba-125

The gamma decay of the nuclei Ba-124,Ba-125 has been investigated by means of the EUROBALL spectrometer, coupled to the DIAMANT array of charged-particle detectors, using the reaction Ni-64 + Ni-64 at E-beam=255 and 261 MeV. In the nucleus Ba-125 six new E1 transitions have been found to link opposi...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2005-12, Vol.72 (6)
Main Authors: Mason, P., Benzoni, G., Bracco, A., Camera, F., Million, B., Cederwall, Bo, Lagergen, K., et al
Format: Article
Language:English
Subjects:
ba-126
clover
detector
euroball
gamma-ray spectroscopy
high-spin states
nuclei
spectrometer
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Summary:The gamma decay of the nuclei Ba-124,Ba-125 has been investigated by means of the EUROBALL spectrometer, coupled to the DIAMANT array of charged-particle detectors, using the reaction Ni-64 + Ni-64 at E-beam=255 and 261 MeV. In the nucleus Ba-125 six new E1 transitions have been found to link opposite-parity bands currently interpreted as nu d(5/2)(+g(7/2)),nu h(11/2) structures. The previously unknown J(pi) = 3(-) level in the nucleus Ba-124 has also been identified; its excitation energy is accurately reproduced by a microscopic calculation including octupole correlations. Both issues are bolstered by sizable B(E1)/B(E2) ratios.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.72.064315