Abstract
In high-resolution measurements of delayed protons following theβ-decays of32Ar and33Ar we have observed significant line broadening caused by theβ —gn recoil motion of the daughter nuclei. The measured line shapes agree well with the calculation for both Fermi and Gamow-Teller decays and yield new spectroscopic information on the transitions and excited states involved. For the Gamow-Teller strength in theβ +-decay of33Ar to the isobaric analogue state in33Cl an upper limit of BGT<0.029 was determined.
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Dedicated to Prof. Jan Zylicz on the occasion of his 60th birthday
We would like to thank P.G. Hansen and J. Lindhard for valuable discussions and the ISOLDE staff for providing excellent secondary Argon beams.