Comparison of polarization and analyzing power for the 15
N(p, n) 15
The analyzing power A y (θ) and polarization P y (θ) for the 15 N(p, n 0 ) 15 O reaction have been measured for E p = 4.5-11.3 MeV. The values of the two observables are nearly the same above 11 MeV, where a "quasi-elastic" view of the (p, n) reaction to the analog state should be applicable. Below 10 MeV, however, large spin-flip amplitudes and isospin-mixing ratios provide the two major conditions needed to obtain P y (θ) ≠ A y (θ), and dramatic differences between the two observables are observed. The size of the differences and their dependence on energy are similar to the results predicted by shell-model calculations. The P y (θ) and A y (θ) measurements have been combined with existing cross-section data to provide information about spin-flip processes. We also comment on the connection between comparisons of P y (θ) and A y (θ) in charge-symmetric (p, n) reactions and the recent controversial measurements of a difference between the values of P y (θ) for a reaction and A y (θ) for the inverse reaction. © 1983.
Byrd, RC; Tornow, W; Lisowski, PW; Murphy, K; Walter, RL
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