ReactionC13(n,p)13B at 65 MeV

The reaction ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$(n,p${)}^{13}$B has been studied at ${\mathit{E}}_{\mathit{n}}$=65 MeV. Cross sections were measured for transitions to the ground state and excited states of ${}_{}{}^{13}{}_{}{}^{}\mathrm{B}$ from 0° to 40°. The 0° cross section to the ground state gives a value of 179±20 MeV ${\mathrm{fm}}^3$ for ${\mathit{V}}_{\mathrm{\sigma }\mathrm{\tau }}^{\mathit{c}}$, the spin-isospin central part of the volume integral of the effective N-N interaction. A theoretical calculation, 181.3 MeV ${\mathrm{fm}}^3$, is in good agreement with this result. Distorted-wave impulse-approximation calculations are compared with the experimental angular distributions. Good agreement is obtained for the dominant Gamow-Teller transition to the ground state of ${}_{}{}^{13}{}_{}{}^{}\mathrm{B}$. The evidence obtained here, together with results from the analogous reaction ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$(${\mathrm{\pi }}^{\mathrm{-}}$,γ${)}^{13}$B, suggests that transitions to states at 6.5 and 7.6 MeV are spin dipole in character and that the broad resonance at 10.2 MeV is chiefly the analog of the giant E1 resonance in ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$. © 1996 The American Physical Society.