, Volume 332, Issue 3, pp 285-287

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

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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.

We wish to thank Miss S.N. Ng for drawing the diagrams.