Three polarization distributions over the angular range from 15° to 135° (lab) have been obtained for neutrons produced in the ${\mathrm{Be}}^9(d, n){\mathrm{B}}^{10}$ reaction. Polarization distributions were obtained for deuteron bombarding energies of 1.56, 2.064, and 2.48 MeV. Polarization measurements were made for up to five neutron groups corresponding to transitions to the ground- and the 0.72-, 1.74-, 2.15-, and 3.58-MeV states of ${\mathrm{B}}^{10}$. A liquid-helium time-of-flight coincidence neutron polarimeter was used to make the measurements. In general, the polarization of the neutrons from the ground state is negative at forward angles and positive at back angles for deuteron bombarding energies from 1.56 to 2.48 MeV, whereas the polarization of the neutrons from the excited states is positive for forward angles and negative for back angles, the exception being neutrons from the 1.74-MeV level in ${\mathrm{B}}^{10}$. The maximum polarization observed is about 35%.

• Received 28 April 1969

DOI:https://doi.org/10.1103/PhysRevC.1.763