[3E05-08] Nuclear Data Measurement 2

[3E08] Photon energy dependence of photo-neutron production from the ¹⁹⁷Au(g,xn) reaction

*Tuyet Kim Tran¹, Toshiya Sanami^1,2, Hirohito Yamazaki^1,2, Toshiro Itoga³, Yasuhito Sakaki², Linh Thi Truc Nguyen⁴, Yoichi Kirihara⁵, Hiroshi Nakashima⁶, Shuji Miyamoto⁷, Yoshihiro Asano² (1. SOKENDAI/KEK, 2. High Energy Accelerator Research Organization (KEK), 3. Japan Synchrotron Radiation Research Institute (JASRI), 4. University of Science, VNU-HCM, Vietnam, Nuclear Technique Laboratory , 5. Japan Atomic Energy Agency (JAEA) , 6. Hokkaido University, 7. University of Hyogo)

Keywords:photo-neutron, photon energy dependence, polarized photon, double differential cross section

The neutron energy spectrum of ¹⁹⁷Au(g,n) for 16.6 MeV polarized photon was studied by Kirihara et al. We observed the evaporation and direct components in the neutron energy spectrum. However, the dependence of these components on the energy of the incident photon was not studied. To understand the photon energy dependence, we took the experimental data of double differential cross-section (DDX) of photo-neutrons with different mono-energies of the incident polarized photons. In this work, the laser Compton scattering (LCS) photons at the energies of 14 MeV, 17 MeV, and 20 MeV were produced in the NewSUBARU-BL01 facility. The LCS photons were collimated into a cylindrical gold target (1cm x 1cm). The photo-neutrons were detected by a cylindrical detector (12.7cm x 12.7cm) filled with liquid organic scintillator NE213. The pulse shape discrimination method was applied to distinguish neutron from gamma events. The neutron energy was determined using time of flight methods. The experimental DDX results for the energies show the two components. The details of the photon energy dependence of the photo-neutron production will be discussed in this presentation.