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. Numao; G. Sheffer; A. Sher; T. Sullivan; K. Tauchi; D. Vavilov; K. Yamada; M. Yoshida

doi:10.1016/j.nima.2015.04.004

Detector for measuring the π⁺ → e⁺ν^e 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

Physics

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

The PIENU experiment at TRIUMF is aimed at a measurement of the branching ratio R^e/μ = Γ((π⁺→e⁺ν_e)+(π⁺→e⁺ν_eγ))/Γ((π⁺→μ⁺ν_μ)+(π⁺→μ⁺ν_μγ)) 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^/μ.

Original language	English (US)
Pages (from-to)	38-46
Number of pages	9
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	791
DOIs	https://doi.org/10.1016/j.nima.2015.04.004
State	Published - Apr 25 2015

Keywords

CsI
NaI(Tl)
Pion decay
Scintillation detectors

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

Access to Document

10.1016/j.nima.2015.04.004

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⁺ν^e 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

Aguilar-Arevalo, AA, 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, SH, Kurchaninov, L, Littenberg, L, Malbrunot, C, Mischke, RE, Muroi, A, Numao, T, Sheffer, G, Sher, A, Sullivan, T, Tauchi, K, Vavilov, D, Yamada, K & Yoshida, M 2015, 'Detector for measuring the π⁺ → e⁺ν^e branching fraction', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 791, pp. 38-46. https://doi.org/10.1016/j.nima.2015.04.004

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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/μ.",

keywords = "CsI, NaI(Tl), Pion decay, Scintillation detectors",

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AU - Aguilar-Arevalo, A. A.

AU - Aoki, M.

AU - Blecher, M.

AU - Vom Bruch, D.

AU - Bryman, D.

AU - Comfort, J.

AU - Cuen-Rochin, S.

AU - Doria, L.

AU - Gumplinger, P.

AU - Hussein, A.

AU - Igarashi, Y.

AU - Ito, N.

AU - Ito, S.

AU - Kettell, S. H.

AU - Kurchaninov, L.

AU - Littenberg, L.

AU - Malbrunot, C.

AU - Mischke, R. E.

AU - Muroi, A.

AU - Numao, T.

AU - Sheffer, G.

AU - Sher, A.

AU - Sullivan, T.

AU - Tauchi, K.

AU - Vavilov, D.

AU - Yamada, K.

AU - Yoshida, M.

PY - 2015/4/25

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N2 - 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/μ.

AB - 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/μ.

KW - CsI

KW - NaI(Tl)

KW - Pion decay

KW - Scintillation detectors

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