Characterization of hundreds of MeV Li(p,n) quasi-monoenergetic neutron source at RCNP using a proton recoil telescope

Hagiwara, Masayuki*; Iwamoto, Yosuke   ; Iwase, Hiroshi*; Yashima, Hiroshi*; Satoh, Daiki   ; Matsumoto, Tetsuro*; Masuda, Akihiko*; Nakane, Yoshihiro  ; Tamii, Atsushi*; Hatanaka, Kichiji*; Nakamura, Takashi*

A Li(p,n) quasi-monoenergetic neutron source for the 100-400 MeV range has been established at the Research Center for Nuclear Physics of Osaka University. The neutron energy spectrum and its intensity were determined by a time of flight (TOF) method and a liquid organic scintillator. However, the neutron-carbon interaction and the light output of the reaction products in the scintillator are not well known. Therefore, the neutron energy spectrum has large uncertainty due to the accuracy of the detection efficiency calculated by Monte Carlo method. In this study, we have measured the neutron itensity with a proton recoils telescope (PRT), because the detection efficiency of PRT can be determined accurately using the well-known differential n-p scattering cross section. We compared the intensity of the peak neutrons obtained by PRT with data with TOF method. As a result, the neutron spectra obtained by PRT and by TOF were generally consistent.