Abstract

The half-life of108m Ag was determined as (310±132) years by measuring the absolute activity of a sample containing a known number of108m Ag nuclei. This could be done by evaluating the cross section for the production of the isomerσ 109Ag(n, 2n)108mAg=(670±266) mb. From the measured half-life a logft-value of 8.9 for the electron capture decay of the isomer to the 1770 keV state of108Pd and a transition probability of (1.0±0.4) · 10−2 Weisskopf units for the M4 transition to the 2−state of108Ag were derived. The cross section for thermal neutrons107Ag(n, γ)108mAg could be calculated to be (7.5±3.2) b by using a related measurement from the literature.

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