β Scribed by S.K. Bhattacherjee; Shree Raman
No coin nor oath required. For personal study only.
The decay by electron capture of G<I lsa (half-life 236 days) is studied with a coincidence Scintillation Spectrometer. Two gamma-rays are observed with energies 724-8 keV and 1004-4 keV and relative intensities of 7 : 100. Both these gamma-rays are coincident with K X-rays of Eu. From the coincidence data the K-sheU conversion coefficient of the I00 keV gamma transition has been determined to be 0.67 4-0.12; the comparison with theory then leads to assigning this gamma-ray preaominantiy to a magnetic dipole transition. From the experimental L/K capture ratio the energy involved in the capture process is estimated. Our results show that the levels in Eu xe8 which are reached by the capture decay of Gd 15a are not identical with the levels that were observed in coulomb excitation of Eu. On the basis of our findings we propose a decay scheme for Gd 16s.
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