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Absolute transition probabilities in134Ba

Authors
Journal
Nuclear Physics A
0375-9474
Publisher
Elsevier
Publication Date
Volume
250
Issue
1
Identifiers
DOI: 10.1016/0375-9474(75)90205-5
Keywords
  • Radioactivity

Abstract

Abstract Lifetime measurements of the excited states of 134Ba were carried out by delayed coincidence measurements between the β-spectrum of 134Cs and the conversion lines and γ-transitions that de-excite the levels, using double-lens coincidence and β-γ coincidence spectrometers. The mean lifetimes of the 1400 keV and 1643 keV levels were determined to be τ = 12.5 ± 2.5 psec and 113 ± 30 psec, respectively. The ratio of the reduced transition probabilities B(E2; 4 + → 2 +)/ B(E2; 2 + → 0 +) = 0.15 ± 0.03. This result does not agree with the prediction of the rotational or vibrational model, although the energy spacings, spin sequence and relative intensities of the de-exciting transitions for the first four excited states could be accounted for by the asymmetric rotational model. The results indicate that the reduction in collectivity as experienced by the 4 + member of the quasi-rotational band, due to an apparent change in the structure of the nucleus, is reflected also in the 3 + member of the γ-vibrational band which is situated nearby in energy.

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