Elsevier

Nuclear Physics A

Volume 286, Issue 2, 15 August 1977, Pages 263-281
Nuclear Physics A

Properties of 81Kr levels populated in the decay of 81Rb isomers

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Abstract

The β+ decay of 81Rb ground and isomeric states (4.58 h and 30.25 min) have been studied with Ge(Li) detectors in both singles and coincidence modes. The decay of the 81Rb isomer (T12 = 30.25 ± 0.25 min) has been investigated for the first time. The relative electron intensities of fourteen transitions in 81Kr have been measured with a magnetic Si(Li) spectrometer and an iron-free toroidal magnetic spectrometer. The internal conversion coefficients have been determined by the normalized electron-to-γ-ray ratio method. The multipolarities of the transitions were deduced. The spin-parity assignments have been made from the consideration of the logft values, the transition multipolarities and the γ-rays branching ratios. The structure of some of the excited states in the 81Kr nucleus is discussed.

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    The Faculty of Mathematics and Physics, Charles University, Prague, Czechoslovakia.

    The Institute of Physics, Slovak Academy of Sciences, Bratislava, Czechoslovakia.

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