Nuclear Levels inCs131

Abstract

Using enriched barium 130, activated in the pile, a spectrometric study has been made of the radiation from the resultant barium 131. Decaying by $K$ capture with a half-life of 11.8 days, thirteen gamma-rays are found to be associated with the disintegration, eight of which have not been previously reported. From the relative intensities of the electron lines and the photoelectron peaks, the multipolarities of six of the transitions are given. A consistent nuclear level scheme of seven terms accounts completely for the observed gamma-transitions.