Decay ofDy165m66(1.2 min)andDy16566(2.3 hr)

Abstract

The activities induced by neutron capture in ${\mathrm{Dy}}^{164}$ have been studied with 180° photographic internal conversion electron spectrometers and a scintillation coincidence spectrometer. The metastable transition energy is 108.0±0.2 kev. Other gamma rays of approximately 160, 360, and 515 kev are associated with the 1.2-min activity and appear to follow beta decay from the metastable level. Gamma rays of 94.4±0.2, 279.4±0.8, 361.2±1.0, 634±3, 710±20, and 1020±30 kev follow the 2.3-hr beta decay from the ground state. Coincidences are observed between members of the pairs (279)-(710) and (361)-(634). The 94-kev gamma ray is coincident with a beta transition of about 1.2 Mev, while the other gamma radiations are coincident with a softer beta component (∼0.3 Mev).