Abstract
Laser Compton gamma-ray beam line on a synchrotron radiation facility NewSUBARU supplies polarized high energy photon beam. Photon energy range of quasi-monochromatic spectrum is from 1.7 MeV to 40 MeV. Beam like high energy photons were converted to electron-positron pair beam and measured by imaging plates separated by a magnetic field. Photo nuclear reaction around 17 MeV photon energy was tested to generate fast neutrons. Spectra of the neutrons were measured by a time of flight technique.
