Data for the (${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^8{}_{}{}^{}\mathrm{B}$) reaction on targets of ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$, and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ at 80 and 93 MeV are presented. Spectroscopic selectivity is observed and evidence for the dominance of spatially symmetric transfer of the two protons is shown. On the $T_z=0\mathrm{}$ targets a close similarity is found to the analogous ($p,t$) reaction, and the ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$ results indicate the location of low-lying $1p$-shell states in ${}_{}{}^{11}{}_{}{}^{}\mathrm{Be}$.

NUCLEAR REACTIONS ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$(${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^8{}_{}{}^{}\mathrm{B}$), ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^8{}_{}{}^{}\mathrm{B}$), ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$(${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^8{}_{}{}^{}\mathrm{B}$), ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^8{}_{}{}^{}\mathrm{B}$), $E=80, 93$ MeV; measured $\sigma (E_f, \theta )$; energy levels ${}_{}{}^8{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^{11}{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$; assessed importance of spatially antisymmetric transfer; comparisons with two-neutron pickup reactions leading to analog states and with two-particle spectroscopic amplitudes; resolution 300 keV.

• Received 6 October 1975

DOI:https://doi.org/10.1103/PhysRevC.13.1330