Decay ofTi51andCr51

Abstract
The radiations of Ti51 (5.8 min) and Cr51 (27 day) have been investigated with beta- and gamma-scintillation spectrometers. Gamma rays having energies of 0.323, 0.605, and 0.928 Mev and relative intensities of 95.8:1.4:4.2, respectively, were observed to accompany the decay of Ti51. Two beta groups were observed of energy 2.13 and 1.5 Mev, having relative intensities of 94.4 and 5.6, respectively. The 2.13-Mev transition leads to the 0.323-Mev level of V51. There is no evidence for a beta transition to the ground state of V51. Cr51 decays by electron capture to both the ground state and the first excited state of V51. The intensity of the capture branch to the 0.323-Mev level was measured to be 9.8 percent. A value of 3.25×103 was found for the total internal conversion coefficient of the 0.323-Mev gamma transition, indicating that the transition is M1+E2. The spin and parity assignments suggested by the experimental data are discussed.

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