Ca40(p,pα)Ar36reaction in a noncoplanar geometry

The ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}(p,p\alpha ){}_{}{}^{36}{}_{}{}^{}\mathrm{Ar}$ reaction has been measured at $E_p=101.3\mathrm{}$ MeV for coplanar quasifree angle pairs (${\theta }_{\rho }=70\mathrm{}°,{\theta }_{\alpha }=-45.7\mathrm{}°$) and out-of-plane angles $\beta =0\mathrm{}°,5°,10°,15°, \mathrm{and} 20°$. Distorted-wave impulse approximation calculations reproduce the shape of the energy sharing distributions and provide spectroscopic factors in agreement with previous work on knockout and transfer reactions.