Abstract
The ß-γ circular polarization correlation asymmetry was measured for the pure Gamow-Teller decay of 28Al, for the pure Fermi decay of 14O and for the mixed decay of the 24Al 4+ ground state to the 8.437 MeV, 4+ state in 24Mg. The expected results were obtained for the pure Gamow-Teller and Fermi decays. From the results of the 24Al decay the isospin mixing of the 8.437 MeV, 4+ state and the 9.515 MeV, 4+ analog state in /sup 24/Mg was determined. The charge dependent matrix element mixing these two states was determined to be -95 ± 36 keV. This is the largest charge dependent matrix element observed in β decay to date. This large value has not been completely explained and suggests the existence of a ΔT = 1 nuclear force.
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