The spectral function for p-n pairs in the ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ ground state (i.e., the distribution in p-n relative momentum ħk for pairs whose c.m. is at rest in the laboratory) was measured for k ranging from 0.6 to 1.5 ${\mathrm{fm}}^{\mathrm{-}1}$, using the ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$(p,pα)pn reaction at 200 MeV. These and earlier 120 MeV ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$(α,2α)pn measurements show that, when k increases from 0.1 to 1.5 ${\mathrm{fm}}^{\mathrm{-}1}$, this function decreases by 4 orders of magnitude and is predicted within a factor of 2 by the plane-wave impulse approximation. The asymmetry for the ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$(p,pα)pn reaction induced with polarized protons was measured at 56° c.m. and found to have the same bombarding-energy dependence as that for p-α elastic scattering. The d-α cluster probability of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, determined by the ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$(p,pα)d reaction, was consistent with that found in other intermediate-energy experiments.

• Received 16 July 1990

DOI:https://doi.org/10.1103/PhysRevC.42.2143