DETAILED-BALANCE TESTS OF TIME-REVERSAL INVARIANCE WITH INTERFERING CHARGED-PARTICLE RESONANCES

Detailed-balance tests of time-reversal invariance (TRI) with charged- particle resonance reactions are reexamined from the view that there m ay be large enhancement of TRI violation near two interfering resonanc es. In our proton resonance data on Na-23, (27)AL, P-31, Cl-35, and K- 39 targets, there are 41 pairs of adjacent resonances with the same an gular momentum and parity. Using experimental resonance parameters, th e difference in the differential cross sections for the (p,alpha(o) an d (alpha, p(o)) reactions was calculated for each of these resonance p airs. An appropriate figure of merit involving both the difference of the two cross sections and the magnitudes of the cross sections was de termined for each resonance pair. Both the differences and the figures of merit show very strong dependence on energy, angle, and the partic ular pair of resonances; the relative sensitivity varies by many order s of magnitude. These results suggest that suitably chosen charged-par ticle resonance tests of TRI violation would be much more sensitive th an previous detailed-balance tests.