Detector for measuring the π+ → e+νe branching fraction

A. A. Aguilar-Arevalo, M. Aoki, M. Blecher, D. Vom Bruch, D. Bryman, J. Comfort, S. Cuen-Rochin, L. Doria, P. Gumplinger, A. Hussein, Y. Igarashi, N. Ito, S. Ito, S. H. Kettell, L. Kurchaninov, L. Littenberg, C. Malbrunot, R. E. Mischke, A. Muroi, T. NumaoG. Sheffer, A. Sher, T. Sullivan, K. Tauchi, D. Vavilov, K. Yamada, M. Yoshida

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The PIENU experiment at TRIUMF is aimed at a measurement of the branching ratio Re/μ = Γ((π+→e+νe)+(π+→e+νeγ))/Γ((π+→μ+νμ)+(π+→μ+νμγ)) with precision <0.1%. Incident pions, delivered at the rate of 60 kHz with momentum 75 MeV/c, were degraded and stopped in a plastic scintillator target. Pions and their decay product positrons were detected with plastic scintillators and tracked with multiwire proportional chambers and silicon strip detectors. The energies of the positrons were measured in a spectrometer consisting of a large NaI(Tl) crystal surrounded by an array of pure CsI crystals. This paper provides a description of the PIENU experimental apparatus and its performance in pursuit of Re.

Original languageEnglish
Pages (from-to)38-46
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume791
DOIs
Publication statusPublished - Apr 25 2015

    Fingerprint

Keywords

  • CsI
  • NaI(Tl)
  • Pion decay
  • Scintillation detectors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

Aguilar-Arevalo, A. A., Aoki, M., Blecher, M., Vom Bruch, D., Bryman, D., Comfort, J., Cuen-Rochin, S., Doria, L., Gumplinger, P., Hussein, A., Igarashi, Y., Ito, N., Ito, S., Kettell, S. H., Kurchaninov, L., Littenberg, L., Malbrunot, C., Mischke, R. E., Muroi, A., ... Yoshida, M. (2015). Detector for measuring the π+ → e+νe branching fraction. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 791, 38-46. https://doi.org/10.1016/j.nima.2015.04.004