T(d, n)He4Reaction as a Source of Polarized Neutrons

The polarization of neutrons from the source reaction $\mathrm{T}(d, n){\mathrm{He}}^4$ has been measured at laboratory angles of 30° and 90° over the range of deuteron energy $E_d$, from 0.1 to 7.7 Mev. In addition, at $E_d=5\mathrm{}$ Mev an angular distribution of the polarization was measured. The polarization, which is small at low energies, at $E_d=7.7\mathrm{}$ Mev attains values of +0.64 and -0.52 at 30° and 90°, respectively. The Basel sign convention is used. The polarization was analyzed by means of a liquid helium scintillator used in coincidence with a plastic scintillator.