Comparison of Py and Ay for 9Be(p,n)9B at 8.1 and 9.1 MeV

Differences between Py and Ay for mirror reactions may be capable of yielding information about isospin violation terms in nuclear interactions [see ref.1)]. Thus far such studies have been reported only for T(p,n)3He and 7Li(p,n)7Be. In the first case, large differences were observed; in the second, considerable similarities were reported, particularly at 3 MeV, the highest energy for which Ay was measured. In order to extend the comparison of these two observables to heavier targets, the 9Be(p,n)9B and 15N(p,n)15O) reactions have been investigated at our laboratory. This report gives the preliminary results of the 9Be(p,n)9B experiment, which obtained Ay data in 10° steps from 20° to 100° at 8.1 and 9.1 MeV and Py data at 8.1 MeV for the same angles.