Low-Pressure MWPC System for the detection of Alpha-Particles and Fission Fragments

Ashot Margaryan, Jan-Olof Adler, Jason Brudvik, N. Grigoryan, Kevin Fissum, Kurt Hansen, Lennart Isaksson, S. Knyazyan, Magnus Lundin, G. Marikyan, Björn Nilsson, L. Parlakyan, Bent Schröder, H. Vardanyan, S. Zhamkochyan

Research output: Contribution to journalArticlepeer-review


A low-pressure, position-sensitive, multi-wire proportional chamber (LPMWPC) system with an active area 12×12 cm 2 for the detection of heavy nuclear fragments, has been developed for use in tagged photon beam experiments. The LPMWPC system can be operated in single as well as double step operational modes. In the case of double step operational mode with a high gas amplification factor, signals from α-particles reside well above the electronic noise. Typical energy loss spectra of alpha particles and fission fragments (FF) obtained from a 252 Cf source are shown and discussed. The pulse height distributions of α-particles have a Landau distribution shape, while the pulse height distribution of FFs differs from Gaussian shape. It has long tails at both low-and high-energy sides. The average pulse height ratio of alpha particles and FF's is close to the theoretical value and amounts to about 1/80.
Original languageEnglish
Pages (from-to)282-291
JournalArmenian Journal of Physics
Issue number4
Publication statusPublished - 2010

Subject classification (UKÄ)

  • Accelerator Physics and Instrumentation


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