Stripping Distortions inB11(d,pγ)B120.95Angular Correlations

Abstract

$p\ensuremath{-}\ensuremath{\gamma}$ angular correlations were measured in the ${\mathrm{B}}^{11}{{(d,p\ensuremath{\gamma})}^{12*}}_{0.95}$ reaction in order to determine how its distortions depend on deuteron energy and proton angle. Various proton angles were used, with ${E}_{d}=1.0,1.8,3.0,\mathrm{and} 5.5$ MeV. These parameters were chosen to systematically test predictions based on an application of the dispersion theory of direct nuclear reactions. The observed failure of the correlation anisotropy to increase as the stripping denominator $D$ is reduced is most easily interpreted as a negative result for the application of this concept to the ${\mathrm{B}}^{11}(d,p){{\mathrm{B}}^{12}}_{0.95}$ reaction. Trends in the behavior of the data are discussed. In addition, spectroscopic information about the captured neutron is deduced, and the excited state of ${\mathrm{B}}^{12}$ is compared with shell-model theory.