N13andC11Range and Angular Distributions fromN14onB10

Abstract

The range and angular distributions of ${\mathrm{N}}^{13}$ and ${\mathrm{C}}^{11}$ particles resulting from the transfer reactions ${\mathrm{B}}^{10}$(${\mathrm{N}}^{14}$, ${\mathrm{N}}^{13}$)${\mathrm{B}}^{11}$ and ${\mathrm{B}}^{10}$(${\mathrm{N}}^{14}$,${\mathrm{C}}^{13}$)${\mathrm{C}}^{11}$, respectively, are reported. It is found that in the first reaction ${\mathrm{N}}^{13}$ nuclei originating from transfers to ${\mathrm{B}}^{11}$ excited states are observed at angles larger than angles at which ${\mathrm{N}}^{13}$ particles due to ground-state transfers are observed; also, the peaks of the ${\mathrm{N}}^{13}$ angular distributions shift to larger angles when the bombarding energy is lowered. The investigation of the proton-transfer reaction is limited by the low-kinetic energy of the ${\mathrm{C}}^{11}$ particles at large laboratory angles, where most of them are observed for a bombarding energy of 28.0 MeV. When the incident ${\mathrm{N}}^{14}$ energy is lowered, more ${\mathrm{C}}^{11}$ particles are observed at smaller angles. This variation with bombarding energy is as expected for a recoil particle (i.e., the particle into which the target nucleus is transformed) in a transfer reaction. Experimental results obtained for both reactions are compared with the tunneling mechanism proposed by Breit for nucleon transfer.