The polarization of five groups of neutrons has been measured at 2.0-MeV deuteron bombarding energy for the ${\mathrm{B}}^{11}(d, n){\mathrm{C}}^{12}$ reaction corresponding to the ground, 4.43-, 7.66-, 9.66-, and 12.76-MeV states of ${\mathrm{C}}^{12}$. A liquid-helium time-of-flight neutron polarimeter was used to make the measurements. The polarization of the neutrons to the ground state and first excited state in ${\mathrm{C}}^{12}$ is positive at forward angles and negative at back angles. The polarization of neutrons to the 7.66-MeV level in ${\mathrm{C}}^{12}$ is negative for angles less than 130°. The polarization of neutrons to the 9.66- and 12.66-MeV levels is negative at forward angles and positive beyond 50°.

• Received 20 May 1969

DOI:https://doi.org/10.1103/PhysRev.187.1266