Tensor Polarization of Deuterons from theBe9(p,d)Be8Reaction

Abstract

The second-rank tensor polarization parameters $〈{T}_{2q}〉$ describing the deuterons produced in the ${\mathrm{Be}}^{9}(p,d){\mathrm{Be}}^{8}$ reaction have been measured for average proton bombarding energies of 2.5 and 3.7 MeV. Measurements were taken at ten-degree intervals for six emission angles between 0\ifmmode^\circ\else\textdegree\fi{} and 50\ifmmode^\circ\else\textdegree\fi{} in the laboratory system. The tensor moments were determined by observing the polar and azimuthal angular dependence of the intensity of the protons from the ${\mathrm{He}}^{3}(d,p){\mathrm{He}}^{4}$ reaction when this reaction is initiated by deuterons from the ${\mathrm{Be}}^{9}(p,d){\mathrm{Be}}^{8}$ reaction. Similar results were obtained at both of the bombarding energies investigated. The $〈{T}_{2q}〉$ are generally negative, with absolute magnitudes of the order of 0.20 or less. Preliminary calculations of the $〈{T}_{2q}〉$ using the distorted-wave Born approximation with spin-orbit terms in the distorting potentials agree generally in sign with the measured values, but are consistently smaller than these by at least an order of magnitude.