Fabrication of silica aerogel with n=1.08 for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0006.gif" overflow="scroll"><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mo>/</mml:mo><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math> separation in a threshold Cherenkov counter of the J-PARC TREK/E36 experiment

Tabata, M.; Toyoda, A.; Kawai, H.; Igarashi, Y.; Imazato, J.; Shimizu, S.; Yamazaki, H.

doi:10.1016/j.nima.2015.06.002

Cited by 12 publications

(3 citation statements)

References 14 publications

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“…Particle identification for + and + was carried out using an aerogel Cherenkov counter [6] and a lead-glass Cherenkov counter [7], and by measuring the time-of-flight between the TOF1 and TOF2 plastic scintillation counters. The CsI(Tl) calorimeter, an assembly of 768 CsI(Tl) crystals, covered 70% of the total solid angle [8].…”

Section: Pos(panic2021)161mentioning

confidence: 99%

Measurement of structure dependent radiative $K^{+} \rightarrow e^{+} \nu \gamma$ decays using stopped positive kaons at E36 (12+3)

Kobayashi¹

2022

Proceedings of Particles and Nuclei International Conference 2021 — PoS(PANIC2021)

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The J-PARC E36 experiment aims at searching for a lepton universality violation by precisely measuring the ratio of the branching ratio of the + → + ( ) ( 2( ) ) to + → + ( 2 ) decays. The E36 experiment was performed in 2015 at J-PARC using a stopped + method in conjunction with a 12-sector iron-core superconducting toroidal spectrometer. Charged particle momenta were calculated by reconstructing the tracks in the spectrometer. Particle discrimination between + and + was carried out using an aerogel Cherenkov counter and a lead-glass Cherenkov counter, as well as by measuring the time-of-flight between TOF counters. The peak structure due to the 2( ) decays was successfully observed in the + momentum spectrum. The structuredependent radiative + → + ( SD 2 ) events were selected by requiring photon hits in the CsI(Tl) calorimeter or the GSC counter. The experimental spectra were reproduced by the Monte Carlo simulation, which indicates a correct understanding of the detector acceptance. The ( SD 2 ) value relative to ( 2( ) ) was obtained by calculating the ratio of the SD 2 and 2( ) yields corrected for their detector acceptances. The ( SD 2 )/ ( 2( ) ) value was obtained to be 1.22 ± 0.07 ± 0.04 in the CsI(Tl) analysis and 1.22 ± 0.13 ± 0.08 in the GSC analysis.

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Section: Pos(panic2021)161mentioning

confidence: 99%

Measurement of structure dependent radiative $K^{+} \rightarrow e^{+} \nu \gamma$ decays using stopped positive kaons at E36 (12+3)

Kobayashi¹

2022

Proceedings of Particles and Nuclei International Conference 2021 — PoS(PANIC2021)

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“…As summarized in Table 1, for example, Aerogel Cherenkov (AC) counters equipped with high-index (n = 1.08) aerogels having sufficient transparency were employed for separating sub-GeV/c positrons from muons to test lepton universality using stopped kaon beams at J-PARC [3]. Ultrahigh-index (n = 1.16) aerogels with high transparency were developed for a RICH detector for use in the High Energy Light Isotope eXperiment (HELIX) supported by U.S. National Aeronautics and Space Administration [4].…”

Section: Aerogel Applications To Cherenkov Detectorsmentioning

confidence: 99%

High-quality aerogel Cherenkov radiators recently developed in Japan

Tabata

2022

J. Phys.: Conf. Ser.

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Around 1980, Japan’s High Energy Accelerator Research Organization, also known as the KEK laboratory, began developing silica aerogels as a Cherenkov radiator. In 1996, the high energy physics group at Chiba University, Japan, began aerogel research and development in collaborating with KEK. The design of state-of-the-art Cherenkov detectors is enabled by improving aerogel transparency. Simultaneously, ultrahigh- and ultralow-refractive-index aerogels were developed to bridge the gap in the available indices for identifying low- and high-momentum particles, respectively. These are and will be employed in ongoing and future particle physics experiments all over the world. We report the latest results from the aerogel development and applications to threshold-type and ring-imaging Cherenkov detectors.

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“…The K e2 and K µ2 , and their radiative decays are collected with a central magnetic field of the spectrometer, B=1.5 T. In order to remove K + → π 0 e + ν (K e3 ) and K + → π 0 µ + ν (K µ3 ) backgrounds, the K e2 and K µ2 events were identified by requiring the e + and µ + momentum to be higher than the K e3 and K µ3 endpoints (P max e =228 MeV/c, P max µ =215 MeV/c). Particle discrimination between e + and µ + was carried out using an aerogel Cherenkov counters [7] and a lead-glass Cherenkov counters [8], and by measuring the time-of-flight between the TOF1 and TOF2 scintillating counters. The TOF1 counters surround the fiber target and TOF2 was located about 90 cm behind C4.…”

Section: Pos(hql2018)032mentioning

confidence: 99%

Measurement of $\Gamma(K_{e2})/\Gamma(K_{\mu2})$ ratio using stopped positive kaons at J-PARC

Shimizu¹

2018

Proceedings of XIV International Conference on Heavy Quarks and Leptons — PoS(HQL2018)

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The J-PARC E36 experiment is aiming at searching for the lepton universality violation by precisely measuring the ratio of the branching ratio of the K + → e + ν (K e2) to K + → µ + ν (K µ2) decays. The E36 experiment was performed at J-PARC employing a stopped K + beam in conjunction with a 12-sector iron-core superconducting toroidal spectrometer. Charged particle momenta were calculated by reconstructing the tracks in the spectrometer. Particle discrimination between e + and µ + was carried out using an aerogel Cherenkov counters and a lead-glass Cherenkov counter, as well as by measuring the time-of-flight between TOF counters. The peak structure due to the K e2 decays was successfully observed in the e + momentum spectrum. The structuredependent radiative K + → e + νγ (K e2γ) events can be selected by requiring one photon hit in the CsI(Tl) calorimeter. The experimental spectra were reproduced by the Monte Carlo simulation, which indicates a correct understanding of the experimental conditions.

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Fabrication of silica aerogel with n=1.08 for e+/μ+ separation in a threshold Cherenkov counter of the J-PARC TREK/E36 experiment

Cited by 12 publications

References 14 publications

Measurement of structure dependent radiative $K^{+} \rightarrow e^{+} \nu \gamma$ decays using stopped positive kaons at E36 (12+3)

Measurement of structure dependent radiative $K^{+} \rightarrow e^{+} \nu \gamma$ decays using stopped positive kaons at E36 (12+3)

High-quality aerogel Cherenkov radiators recently developed in Japan

Measurement of $\Gamma(K_{e2})/\Gamma(K_{\mu2})$ ratio using stopped positive kaons at J-PARC

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