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Polarization Effects in the Isospin-Coupled Reaction Channelsp+Zr91andn+NbIAS*91

Physical Review C1972Vol. 6(1), pp. 366–369

J. G. Cramer, E. Preikschat, M. Baker, M. D. Hasinoff, Greg Roth, W.G. Weitkamp, W. J. Braithwaite, C. F. Moore

Abstract

The analyzing-power and differential cross-section excitation functions for the reaction $p$ + $^{91}\mathrm{Zr}$ have been measured at 150\ifmmode^\circ\else\textdegree\fi{} in the energy range from 10.0 to 14.9 MeV, which spans the thresholds of the ($p, n$) quasi-elastic and quasi-inelastic reaction channels leading to the production of the analogs in $^{91}\mathrm{Nb}$ of the $^{91}\mathrm{Zr}$ target ground state and ${\frac{5}{2}}^{+}$ (1.46 MeV) excited state, respectively. A pronounced variation in the analyzing power is observed in the ($\stackrel{\ensuremath{\rightarrow}}{p}, {d}_{0}$) exit channel at just the energy regions where charge-exchange coupling is expected to occur due to the opening of the quasi-elastic and quasi-inelastic channels. Somewhat less expected is the change in analyzing power observed in the elastic proton channel in the vicinity of the quasi-elastic and quasi-inelastic thresholds. Sharp resonance structures are observed in the analyzing-power and differential cross-section excitation functions for the ($\stackrel{\ensuremath{\rightarrow}}{p}, {d}_{0}$) channel near the quasi-elastic and quasi-inelastic thresholds which are not readily observable in the elastic channel. The analyzing power for the ($\stackrel{\ensuremath{\rightarrow}}{p}, n\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{p}$) process has been measured at a number of energies in this region and found to be consistent with zero.

Abstract

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