The ($p, p\alpha$) and ($p, d{}_{}{}^3{}_{}{}^{}\mathrm{He}$) reactions on ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ have been investigated at a bombarding energy of 101.5 MeV in a non-coplanar geometry. Coincident data were obtained for coplanar angles ${\theta }_{p,d}=81.2\mathrm{}°$ and ${\theta }_{\alpha ,{}_{}{}^3{}_{}{}^{}\mathrm{He}}=-41.0\mathrm{}°$, and the $\alpha \left({}_{}{}^3{}_{}{}^{}\mathrm{He}\right)$ detector ranging from $\beta =0\mathrm{}° \mathrm{to} 20°$ out of the plane. These data show a smooth reduction in cross section with increasing $\beta$. Comparisons with distorted-wave impulse approximation calculations show that the reactions are dominated by quasifree processes, and that the $D$-state component of the ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ wave function dominates for large $\beta$. Absolute spectroscopic factors for the $S$- and $D$-state terms extracted from the two different reactions are consistent and in excellent agreement with theoretical predictions.

NUCLEAR REACTIONS ${}_{}{}^9{}_{}{}^{}\mathrm{Be}(p, p\alpha )$ and ${}_{}{}^9{}_{}{}^{}\mathrm{Be}(p, d{}_{}{}^3{}_{}{}^{}\mathrm{He})$, $E_{\mathrm{lab}}=101.5\mathrm{}$ MeV; measured $\frac{d^3\sigma }{d{\Omega }_{1}d{\Omega }_{2}d{E}_1}$ ($E_1, E_2, {\theta }_1, {\theta }_2, {\beta }_2$); Non-coplanar geometry; DWIA analysis; deduced alpha particle spectroscopic factors.

• Received 25 April 1980

DOI:https://doi.org/10.1103/PhysRevC.22.1394