Applicability of Parallel Plate Avalanche Counters to Spontaneous Fission from Cf-252
Author
Summary, in English
The construction and performance of the parallel plate avalanche counters (PPACs) using a spontaneous fission source Cf-252 is described in this paper. The parallel plate circular electrodes are made of aluminum foils having a thickness less than ten microns. After fabrication, the detectors and the source are mounted inside a reaction chamber, the source between the two detectors. A low pressure is created inside the chamber using isobutane (C4H10) and a high voltage is applied to the electrodes. The detectors are first operated at different pressures and voltages to find the optimum values of the pressure and the voltage. This is necessary to avoid the sparking threshold, to achieve a good time resolution and to keep the gain of the detectors high and constant. The. PPACs are operated in 2 pi- and 4 pi-geometries. In 4 pi-geometry the detectors are allowed to function in coincidence and noncoincidence mode. The resulting pulse height and the time spectra are studied using the computer code ROOT and some conclusions are drawn from these analyses. The pulse height spectrum shows a clear separation between the fission fragments and the alpha particles and the time spectrum indicates a good intrinsic time resolution, 0.76 ns.
Department/s
Publishing year
2012
Language
English
Publication/Series
International Journal of Modern Physics E
Volume
21
Issue
4
Document type
Journal article
Publisher
World Scientific Publishing
Topic
- Physical Sciences
- Natural Sciences
Keywords
- PPACs
- Cf-252
- spontaneous fission
- time resolution
Status
Published
ISBN/ISSN/Other
- ISSN: 0218-3013