Design, Commissioning and Performance of the PIBETA Detector at PSI

E. Frlez; D. Pocanic; K. A. Assamagan; Yu. Bagaturia; V. A. Baranov; W. Bertl; Ch. Broennimann; M. A. Bychkov; J. F. Crawford; M. Daum; Th. Fluegel; R. Frosch; R. Horisberger; V. A. Kalinnikov; V. V. Karpukhin; N. V. Khomutov; J. E. Koglin; A. S. Korenchenko; S. M. Korenchenko; T. Kozlowski; B. Krause; N. P. Kravchuk; N. A. Kuchinsky; W. Li; D. W. Lawrence; R. C. Minehart; D. Mzhavia; H. Obermeier; D. Renker; B. G. Ritchie; S. Ritt; T. Sakhelashvili; R. Schnyder; V. V. Sidorkin; P. L. Slocum; L. C. Smith; N. Soic; W. A. Stephens; I. Supek; Z. Tsamalaidze; B. A. VanDevender; Y. Wang; H. -P. Wirtz; K. O. H. Ziock

doi:10.1016/j.nima.2004.03.137

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arXiv · hep-ex/0312017

Design, Commissioning and Performance of the PIBETA Detector at PSI

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Abstract

We describe the design, construction and performance of the PIBETA detector built for the precise measurement of the branching ratio of pion beta decay, pi+ -> pi0 e+ nu, at the Paul Scherrer Institute. The central part of the detector is a 240-module spherical pure CsI calorimeter covering 3*pi sr solid angle. The calorimeter is supplemented with an active collimator/beam degrader system, an active segmented plastic target, a pair of low-mass cylindrical wire chambers and a 20-element cylindrical plastic scintillator hodoscope. The whole detector system is housed inside a temperature-controlled lead brick enclosure which in turn is lined with cosmic muon plastic veto counters. Commissioning and calibration data were taken during two three-month beam periods in 1999/2000 with pi+ stopping rates between 1.3*E3 pi+/s and 1.3*E6 pi+/s. We examine the timing, energy and angular detector resolution for photons, positrons and protons in the energy range of 5-150 MeV, as well as the response of the detector to cosmic muons. We illustrate the detector signatures for the assorted rare pion and muon decays and their associated backgrounds.

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E. Frlez, D. Pocanic, K. A. Assamagan, Yu. Bagaturia, V. A. Baranov, W. Bertl, Ch. Broennimann, M. A. Bychkov, J. F. Crawford, M. Daum, Th. Fluegel, R. Frosch, R. Horisberger, V. A. Kalinnikov, V. V. Karpukhin, N. V. Khomutov, J. E. Koglin, A. S. Korenchenko, S. M. Korenchenko, T. Kozlowski, B. Krause, N. P. Kravchuk, N. A. Kuchinsky, W. Li, D. W. Lawrence, R. C. Minehart, D. Mzhavia, H. Obermeier, D. Renker, B. G. Ritchie, S. Ritt, T. Sakhelashvili, R. Schnyder, V. V. Sidorkin, P. L. Slocum, L. C. Smith, N. Soic, W. A. Stephens, I. Supek, Z. Tsamalaidze, B. A. VanDevender, Y. Wang, H. -P. Wirtz, K. O. H. Ziock. 2003-12-04. Design, Commissioning and Performance of the PIBETA Detector at PSI. https://doi.org/10.1016/j.nima.2004.03.137

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