Der Zerfall des^125mXe, des^127mXe und des^127gXe

Abstract

The decay of^125mXe produced by the reaction¹²²Te(α, n)^125mXe using a target enriched in¹²²Te (95.4%) and the decay of^127mXe produced by the reaction¹²⁷J(d, 2n)^127mXe have been investigated:

^125mXe decays with a half-life ofT _1/2=(56±3) sec by ayy- cascade withE _γ1=(140.4 ±0.5) keV andE _γ2=(110.5 ±0.5) keV. The experimental conversion coefficients yield multipolarities ofE3 for the 140.4 keV isomeric transition and predominantlyM1 for the 110.5 keV-transition.

^127mXe decays with a half-life ofT _1/2=(71±2) sec. The decay also proceeds by aγγ-cascade with an isomeric E3 transition ofE _γ1=(172.5±0.3) keV and a predominantlyM1 transition ofE _γ2=(124.6±0.3) keV.

In the decay of^127gXe an additional branching of the electron capture to a level at (618.1±0.3) keV was observed. The relative probability forK-captureP _K618/P_K375=0.40 ±0.07 yields a total transition energyQ _EC=(664 ±4)keV. A spin of 1/2⁺ was assigned to the ground state.