CsI endcap photon detector for a K/sup +//spl rarr//spl pi//sup +//spl nu//spl nu

Chiang, I. H.; Garber, E.; Inagaki, T.; Ino, Kazusumi; Kabe, S.; Kettell, S. H.; Kobayashi, Masaaki; Komatsubara, T. K.; Kuno, Y.; Li, K.K.; Littenberg, L.; Morimoto, Takahiro; Nakano, Takashi; Omata, K.; Sato, Takahiro; Shinkawa, T.; Sugimoto, S.; Tauchi, K.; Yamashita, A.; Yoshimura, Y.

doi:10.1109/23.467813

Cited by 31 publications

(5 citation statements)

References 16 publications

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“…The 48 cm diameter, 48 cm long NaI(Tl) crystal [2] under study was surrounded by two adjacent rings of 97 pure CsI crystals [4]. Each ring was comprised of two layers of 8.5 cm thick, 25 cm long crystals.…”

Section: Experiments Setupmentioning

confidence: 99%

Study of a large NaI(Tl) crystal

Aguilar-Arevalo

Aoki

Blecher

et al. 2010

Nuclear Instruments and Methods in Physics Research Section A:

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Using a narrow band positron beam, the response of a large high-resolution NaI(Tl) crystal to an incident positron beam was measured. It was found that nuclear interactions cause the appearance of additional peaks in the low energy tail of the deposited energy spectrum.Keywords: Calorimeter, Scintillation detectors, Photonuclear reactions MotivationThe PIENU experiment at TRIUMF [1] is aiming at a measurement of the branching ratio R = Γ(π → eν + π → eνγ)/Γ(π → µν + π → µνγ) with precision <0.1%. The principal instrument used to measure positron energies from π + → e + ν decays (E e + = 70 MeV) and π + → µ + ν followed by µ + → e + νν decays (E e + = 0 − 53 MeV) is a large single crystal NaI(Tl) detector [2]. Detailed knowledge of the crystal response is essential to reaching high precision, especially for determining the low energy tail response below 60 MeV [3]. In the following, results of measurements of the response of the NaI(Tl) crystal to mono-energetic positron beams are presented along with Monte Carlo (MC) simulations including photonuclear reactions. Experiment SetupThe 48 cm diameter, 48 cm long NaI(Tl) crystal [2] under study was surrounded by two adjacent rings of 97 pure CsI crystals [4]. Each ring was comprised of two layers of 8.5 cm thick, 25 cm long * Corresponding author. luca@triumf.ca (L. Doria) * * Corresponding author. toshio@triumf.ca (T. Numao) crystals. Positrons from the M13 beamline at TRI-UMF [5] were injected into the NaI(Tl) crystal to study its response. The positrons were produced by 500 MeV protons from the TRIUMF cyclotron striking a 1 cm thick beryllium target. After defining the beam momentum at the first focus, the M13 beam line is equipped with two more dipole magnets and two foci with slits before the final focus at the detector. The vacuum window was a 0.13 mm thick, 15 cm diameter Mylar foil. With this geometry, slit scattering and the effect of the vacuum window were expected to have negligible effect on the low energy tail. The incoming beam was measured with a telescope (see fig. 1) consisting of 6 planes of wire chambers arranged in the orientation of X-U-V-X-U-V, where U(V) was at 60• (−60 • ) to the vertical direction, a plastic scintillator (5×5 cm 2 area, 3.2 mm thickness), and the NaI(Tl) calorimeter. The beam momentum width and horizontal (vertical) size and divergence were 1.5% in FWHM, 2cm (1cm) and ±50mrad (±90mrad), respectively. The beam composition was 63% π + , 11% µ + and 26% e + . Measurement and ResultsA 70 MeV/c positron beam was injected into the center of the NaI(Tl) crystal. The beam

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Section: Experiments Setupmentioning

confidence: 99%

Study of a large NaI(Tl) crystal

Aguilar-Arevalo

Aoki

Blecher

et al. 2010

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

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“…BINAʼs energy resolution of approximately 2.2% FWHM for incident positrons at 70 MeV [44] is better by a factor of approximately two than the resolution observed in the previous measurement with TINA [33]. The NaI detector is surrounded by two layers consisting of 97 pure CsI crystals, 8.5 cm thick, 2 cm wide and 25 cm long [45,46] to capture electromagnetic shower leakage from BINA, thus helping to suppress the instrumental low-energy 'tail'.…”

Section: The Pienu Experiments At Triumfmentioning

confidence: 84%

Experimental study of rare charged pion decays

Počanić

Frlež

Schaaf

2014

J. Phys. G: Nucl. Part. Phys.

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The combination of simple dynamics, small number of available decay channels, and extremely well controlled radiative and loop corrections, make charged pion decays a sensitive means for testing the underlying symmetries and the universality of weak fermion couplings, as well as for improving our understanding of pion structure and chiral dynamics. This paper reviews the current state of experimental study of the allowed rare decays of charged pions: (a) leptonic, π + → e + ν e , or π e2 , (b) radiative, π + → e + ν e γ, or π e2γ , and π + → e + ν e e + e − , or π e2ee , and (c) semileptonic, π + → π 0 e + ν, or π e3 . Taken together, the combined data set presents an internally consistent picture that also agrees well with standard model predictions. The internal consistency is illustrated well by the π e2 branching ratio of (R π e/µ ) PIBETA = (1.2366±0.0064)×10 −4 extracted in this work from the PIBETA measurement of the π e3 decay and the current best value for the CKM matrix element V ud . However, even after the great progress of the recent decades, experimental precision is lagging far behind that of the theoretical description for all above processes. We review the implications of the present state of knowledge and prospects for further improvement in the near term.

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“…Positrons from µ + → e + νν decays were measured by another X-Y set of silicon strip detectors (S3), two thin plastic scintillators (T1 and T2), a set of wire chambers (WC3), and a calorimeter, consisting of a 48-cm (dia.) × 48-cm (length) singlecrystal NaI(Tℓ) detector [22] surrounded by two concentric layers of pure CsI crystals [23].…”

Section: Introductionmentioning

confidence: 99%