Abstract
Differences between the polarization (P) and the analyzing power (A) in (p,n) reactions connecting corresponding states in mirror nuclei have been of particular interest since it was pointed out by Haight et al.1 that such differences can arise only as a result of charge dependent effects. Comparison’ of early measurements of P and of A in the 3H(p,n)3He reaction at first suggested the existence of a small but significant (~17%) difference between P and A in the energy region Ep ~ 1.7 to 4 MeV. Subsequent remeasurement of both P and A, however, has shown2,3 that there is actually no difference to within experimental uncertainty. In sharp contrast to this result, sizable P-A differences have recently been observed3,4 in the 15N(p,n)15O reaction, extending over the energy region Ep ~ 4.5 to 9.5 MeV. The observed P-A difference is a rapidly fluctuating function of the incident energy, and appears to be intimately associated with some of the resonance structures which are prevalent in this energy region.
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