Pulse shape analysing system for a gridded ionization chamber

Digital pulse shape analysis (dpsa) has been used with a Frisch-gridded ionization chamber to study the charged particle emission reactions induced by fast neutrons. The structure of Frisch-gridded ionization chamber and his performance were presented in more detail in ref. [1]. Here we describe experimental use of the ionization chamber combined with PXI system in detection of charged particles. The PXI system consisting of a chassis NI PXI-1031, an embedded controller NI PXI-8820 and a high-speed digitizer pixie-4 from XIA [2]. The pixie-4 is a PCI/PXI 4-channel all-digital waveform data-acquisition card featuring on-line pulse-shape analysis. Incoming signals are digitized with 14-bit 75 msps ADCs. Rise-time dpsa has been employed using data as an examples measurements of charged particles originating from reactions on Li-6 and B-10 nuclei induced by thermalized neutrons from an Am-241-Be source.