| Popis: |
The BETA - gamma circular-polarization angular correlation is measured for V/sup 8/, Co/sup 56/6, Fe/sup 59/, and Cs/sup 134/. Since all of th ese decays (with one exception) are characterized by DELTA J = 0, J x 0, and DELTA T approximately 1, they possess the necessary elements for testing isospin conservation in allowed BETA decay. The asymmetry parameters are measured. The results are consistent in all cases with a very small Fermi matrix element and therefore support the validity of isospin conservation, with the doubtful exception of the 271-kev BETA decay branch of Fe/sup 59/. However, in this case the extreme difficulty of disentangling the 271-kev branch from the 462kev branch, which is a pure Gamow-Teller branch, renders this exception rather uncertain. The Cs/sup 134/ result shows definite interference, but because of the large ft value the Fermi matrix element is still very small, in keeping with the other findings. (auth) |
