Characteristics of 2-dimensional micro-pixel gas chamber under Cf-252 neutron irradiation

To, Kentaro  ; Yamagishi, Hideshi; Soyama, Kazuhiko  ; Ochi, Atsuhiko*; Tanimori, Toru*

Neutron scattering experiments using high intensity pulsed neutrons will be carried out in Materials and Life Science Facility at J-PARC. Detectors using in the facility require features such as a good spatial resolution, high detection efficiency, fast response, etc. We have developed a 2D position sensitive neutron detector system consist of micro-pattern detector array such as microstrip and miltiwire detector array. In this presentation, characteristics of the 2D micro-pixel gas chamber system under Cf-252 neutron irradiation are reported. Detection area used in this experiment is 5050 mm and pitches of both axes, anodes and cathodes, are 0.4 mm. Irradiation were carried out with a mixture gas of helium-3 and carbon tetrafluoride. It can be seen that signal pulse peaks of neutrons can be identified and these pulse peaks is discriminated easily from background noises. Here, degradation of gas gain arisen from a charge up effect was not observed in our system.