Abstract. The decay of 2.4 h ll7gCd and 3.4 h t~TmCd has been investigated with the use of high-resolution Si(Li) and Ge(Li) detectors, also in an anti-Compton arrangement. Spectra from the two isomers have been resolved by comparing young reactor-produced HTCd with aged cyclotron-produced tt 7Cd" Ge(Li)-Ge(Li) coincidences have been measured with a multi-parameter analyzer. A hundred observed ),-rays are placed in a level scheme of ~tTIn. Possible theoretical interpretations are discussed. The I.T. Branching of 1~71n is (47.1 _+ 1.5)~o. Only about 1 ~o of 11/2-tt~mCd decays to 1.93 h 1/2 117"In and 10.9 o~ of 1/2 + t~VgCd decays to the 9/2 + ~Vgln ground state bypassing the isomeric In state.
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