Neutron-induced cross-section measurement of hydrogen containing materials at 20 300 K; o-xylene, m-xylene and p-xylene

Harada, Masahide   ; Abe, Yutaka*; Teshigawara, Makoto   ; Oi, Motoki ; Ikeda, Yujiro*; Oikawa, Kenichi   ; Kawamura, Seiko   ; Inamura, Yasuhiro  

Hydrogenous materials are mainly applied as a moderator material used in high-intense and small neutron sources because of good moderating characterization for neutrons. Scattering data including total cross sections of cold-thermal neutrons are important to characterize moderators. However, as some measurements are old, we have been continuously and systematically measuring the cross sections of hydrogenous materials since 2018 for a new neutron source development. In this presentation, the measurements of o-xylene, m-xylene and p-xylene carried out in 2020 and 2021 will be presented as a hydrogenous material. The measurements were performed at NOBORU and AMATERAS in MLF of J-PARC. The total cross sections were measured at NOBORU, and the scattering cross sections were measured at AMATERAS. The sample temperatures were 20, 100, 200, 300 K and temperatures near the melting point. The sample was contained in an aluminum cell. The time-of-flight method was used to measure the energy-dependent transmission of the sample. The scattering data was converted to the scattering cross section by a multiple energy chopping. Details will be reported on the day.