The nuclear radiations from Ba 139 have been investigated with the help of a magnetic lens spectrograph and scintillation counters in coincidence. Beta rays of energy 2.380, 2.227, and 0.822 Mev have been found together with an internal conversion line from a gamma ray of energy 0.163 Mev. The photoelectron spectrum, taken in the lens, showed gamma rays of energies 0.163 and 1.43 Mev. Beta-gamma coincidence experiments, performed with scintillation counters, showed that the 2.23-Mev beta-ray group is in coincidence with the 0.163-Mev gamma ray. The 0.163-Mev line has a K/(L-\-M) ratio of 7.0 and an internal conversion coefficient a K of 0.22, both of which correspond to an Ml transition. The connection with the shell model is discussed.
Investigations of the nuclear radiations from the 30-hour isomeric state of Te 131 have been made with the help of magnetic lens spectrometers and scintillation counters. Beta-ray groups of end-point energies 2.46, 2.14, 1.69, 1.35, 0.98, 0.57, and 0.42 Mev have been found. The well-known internally converted 0.180-Mev transition, that from the 30-hour isomeric state of Te 131 to the 25-minute ground state, was reinvestigated, and its K/{L-\-M) ratio of 2.4 corresponds to that of an Mk transition. Photoelectron spectra show well denned lines corresponding to gamma-ray energies of 0.773, 0.446, 0.331, 0.147, and 1.12 Mev, and weaker lines corresponding to gamma-ray energies of 0.24, 0.275, 0.575, 0.84, and 1.63 Mev. Gray wedge pictures of Nal(Tl) scintillation spectra indicate that the 0.147 and 0.446-Mev transitions are the main lines appearing in the 25-minute tellurium with the 0.773-Mev line also visible. Gamma-gamma scintillation coincidence experiments on the long-lived tellurium are utilized in establishing a possible decay scheme.
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