Gamow-Teller strength in the ?+ decay of104In

Abstract

The {/-strength function of 1~ is studied in the//+/EC decay of mass-separated 1~The determination of the /3+ feeding and the //+///++EC ratio is the result of the simultaneous measurement of beta and gamma rays in one semiconductor beta-spectrometer. Information on the strength function near the QEc value is obtained from the detection of high-energy 7 rays. The total observed ]~ strength amounts up to 10% of the Extreme SingleParticle Shell Model value. A strong enhancement in the//+/EC feeding to a group of levels around 5.6 MeV shows the influence of the Gamow-Teller Resonance.

Gamow-Teller strength distribution in the beta-decay of100Ag from total-absorption gamma spectrometry

“…This discrepancy could at least partly be explained by unusually large/3-delayed proton branching ratios of 96,98Cd and/or 96'98Ag [17]. The resonance-like/3-feeding of highenergy states, that has been found in this work as well as in other recent experiments [2,3,4,10,13,14], may lead to such an enhanced proton emisson.…”

“…Some interesting results have already been obtained for ~°°,~°2,t°4In [3,4]: high-resolution studies and measurements of positron or /3-delayed proton spectra indicate a concentration of the GT strength at excitation energies of a few MeV in the respective cadmium daughter nuclei. The predominant feeding of high-lying levels is actually expected to be a general decay feature of odd-odd nuclei in this region [2].…”