@article{975955c690b14c85bd64ad79a13e9f82,
title = "Design, commissioning and performance of the PIBETA detector at PSI",
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, π+→π0e+νe, at the Paul Scherrer Institute. The central part of the detector is a 240-module spherical pure CsI calorimeter covering ∼3π 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 3-month beam periods in 1999/2000 with π+ stopping rates between 1.3·103 π+/s and 1.3·106 π+/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.",
keywords = "Calibration and performance, Construction, Detector design, Large acceptance segmented calorimeter, Pure CsI scintillators, Tracking and particle identification",
author = "E. Frle{\v z} and D. Po{\v c}ani{\'c} and Assamagan, {K. A.} and Yu Bagaturia and Baranov, {V. A.} and W. Bertl and Ch Br{\"o}nnimann and M. Bychkov and Crawford, {J. F.} and M. Daum and Th Fl{\"u}gel and R. Frosch and R. Horisberger and Kalinnikov, {V. A.} and Karpukhin, {V. V.} and Khomutov, {N. V.} and Koglin, {J. E.} and Korenchenko, {A. S.} and Korenchenko, {S. M.} and T. Kozlowski and B. Krause and Kravchuk, {N. P.} and Kuchinsky, {N. A.} and W. Li and Lawrence, {D. W.} and Minehart, {R. C.} and D. Mzhavia and H. Obermeier and D. Renker and Barry Ritchie and S. Ritt and T. Sakhelashvili and R. Schnyder and Sidorkin, {V. V.} and Slocum, {P. L.} and Smith, {L. C.} and N. Soi{\'c} and Stephens, {W. A.} and I. Supek and Z. Tsamalaidze and VanDevender, {B. A.} and Y. Wang and Wirtz, {H. P.} and Ziock, {K. O H}",
note = "Funding Information: The PIBETA experiment has been supported by the National Science Foundation, the Paul Scherrer Institute and the Russian Foundation for Basic Research. This material is based upon work supported by the National Science Foundation under Grant No. 0098758. Funding Information: The degrader counter is supported by a plastic stand, which also holds the PMTs and voltage divider bases. It is mounted at the ends of four steel threaded rods protruding from the outer support structure of the detector into its center from the upstream side, leaving a gap to the active target face. The inner active collimator is mounted to the same mechanical support structure and covers the rods in the direction of the beam. ",
year = "2004",
month = jul,
day = "1",
doi = "10.1016/j.nima.2004.03.137",
language = "English (US)",
volume = "526",
pages = "300--347",
journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
issn = "0168-9002",
publisher = "Elsevier",
number = "3",
}