The Fermi to Gamow-Teller mixing ratio of theβ ⁺ decay of⁵²Mn and time-reversal invariance

Abstract

To date, ten experimental measurements of the asymmetry parameter have been made for the positron decay of⁵²Mn. The Fermi to Gamow-Teller mixing ratioy can be deduced from such measurements and this quantity is important because the time-reversal violating amplitude is proportional toy/(1+y²). Our theoretical calculation using the Collective Model yieldsy=− 3.5×10⁻⁴ for the deformation parameterβ=0.1 andy=− 4.6×10⁻⁴ forβ=0.2. Such small values ofy are consistent with time-reversal invarisance.