Book Description

The polarization of neutrons photoproduced from deuterium at about 148 degrees in the center of mass system was measured in the photon energy range of 11.0-22.9 Mev. The neutron polarization was analyzed in a low pressure helium diffusion cloud chamber by scattering the neutrons and observing the left-right asymmetry in the helium gas nuclear recoils achieved by photographing the individual recoils on film. Measurements were made on the stereoscopically projected recoil track images, and the data subjected to a maximum likelihood calculation. The polarizations measured in 4 photon energy intervals of 11.0-12.9 Mev, 13.0-15.9, Mev, 16.017.9 Mev and 18.0-22.9 Mev are -0.032 + or -0.078, -0.198 + or -0.086, -0.25 + or -0.12, and -0.296 + or 1 0.137, respectively. The polarization is defined as positive in the directions of the incoming photon and outgoing photoneutron. (Author).