Isospin-forbidden positron decay of V48 and time-reversal invariance

Abstract

A large number of - circular polarization experiments have been performed to obtain the asymmetry coefficient for the 48V 48Ti decay. The Fermi to Gamow-Teller mixing ratio y can be deduced from such measurements, and is important since the time-reversal violating amplitude is proportional to y/(1+y2). Unfortunately, owing to the scatter in the experimentally deduced value of y, nothing can be said about the time-reversal property of this decay. Our theoretical calculation using the Nilsson model yields values of y consistent with four of the more recent experiments and also consistent with time-reversal invariance. © 1988 The American Physical Society.