The polarization of neutrons from the ${\mathrm{C}}^{13}(p, n_0){\mathrm{N}}^{13}$ and ${\mathrm{N}}^{15}(p, n_0){\mathrm{O}}^{15}$ reactions has been measured for proton energies in the region between 6.9 and 12.3 MeV and neutron-emission angles between 0 and 90°. The neutrons were detected using the Livermore time-of-flight facility incorporating pulse-shape discrimination to reduce the time-independent background. The "left" and "right" measurements were obtained by employing a solenoid for spin precession. Liquid helium was utilized as an analyzer. Large polarizations (50 to 70%) were measured for both reactions at several energies and angles. Corrections for multiple scattering in the analyzer have been made. The measurements are compared with the polarization predictions of the quasielastic model of the ($p, n$) process.

• Received 31 July 1964

DOI:https://doi.org/10.1103/PhysRev.137.B347