[1N13-15] Nuclear Data Measurement 2

[1N13] Double differential cross-section measurement of the medium-heavy nuclei (g,xn) reaction for 16.6 MeV polarized photons

*Tuyet Kim Tran¹, Toshiya Sanami^1,2, Hirohito Yamazaki^1,2, Toshiro Itoga³, Akihiro Takeuchi¹, Shuji Miyamoto⁴, Hiroshi Nakashima⁵, Yoshihiro Asano ² (1. SOKENDAI, 2. High Energy Accelerator Research Organization (KEK), 3. Japan Synchrotron Radiation Research Institute (JASRI), 4. LASTI/University of Hyogo, 5. Hokkaido University)

Keywords:photo-neutron, double differential cross-section, neutron spectrum, angular distribution, Laser Compton Scattering, time-of-flight

Our group has measured photo-neutron spectrum for the (g,n) reaction using mono-energetic polarized photons. In previous presentation, we identified the evaporation and direct components on the neutron energy spectra of (g,n) reaction for medium-heavy targets. Kirihara et al. showed the direct component of Au target has angular distribution of a + b·cos(2Θ). Thus, we took experimental data of double differential cross-section of the (g,xn) reaction on Pb, Au, Sn, Cu, Fe and Ti targets for 16.6 MeV polarized photons, then discuss angular distribution of direct components. Mono-energetic polarized photon beam was prepared with laser Compton backscattering technique at BL1, NewSUBARU. NE213 scintillation neutron detectors, the time of flight and pulse shape discrimination techniques were employed for neutron spectroscopy. By integrating experimental double differential cross-sections, the angular differential cross-section of the direct components were determined. They followed a + b·cos(2Θ) distribution, as well as the Au(g,n) reaction