Commissioning of the New Electronics and Online System for the Super-Kamiokande Experiment

Yamada, S.; Awai, K.; Hayato, Y.; Kaneyuki, K.; Kouzuma, Y.; Nakayama, S.; Nishino, Hitoshi; Okumura, K.; Obayashi, Y.; Shimizu, Yuki; Shiozawa, M.; Takeda, Atsushi; Yokozawa, T.; Koshio, Y.; Moriyama, S.; Heng, Y. K.; Chen, S.; Yang, B. S.; Tanaka, Takayuki; Arai, Y.; Ishikawa, Keisuke; Minegishi, A.; Uchida, Tomohisa

doi:10.1109/tns.2009.2034854

Cited by 42 publications

(27 citation statements)

References 10 publications

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“…Analog signals are produced and sent through 25 m RG303/U single cables to the signal processing front-end boards. The RENO data acquisition (DAQ) system uses electronic modules developed for the Super-Kamiokande experiment [16] and consists of a total of 18 front-end boards with 24 channels each, driven by a common 60 MHz master clock. Each frontend board is equipped with eight charge-to-time conversion (QTC) chips, four time-to-digital converter (TDC) chips, and an 100 Mbps ethernet card.…”

Section: Data Acquisitionmentioning

confidence: 99%

“…Using the two identical detectors in separate locations the RENO experiment measures the reactor ν e survival probability, P ee ≡ P (ν e → ν e ) [9], arXiv:1610.04326v7 [hep-ex] 16 May 2018 P ee = 1 − sin 2 2θ 13 (cos 2 θ 12 sin 2 ∆ 31 + sin 2 θ 12 sin 2 ∆ 32 ) − cos 4 θ 13 sin 2 2θ 12 sin 2 ∆ 21 ≈ 1 − sin 2 2θ 13 sin 2 ∆ ee − cos 4 θ 13 sin 2 2θ 12 sin 2 ∆ 21 , (1) where ∆ ij ≡ 1.267∆m 2 ij L/E ν , E ν is the ν e energy in MeV, L is the distance between the reactor and detector in meters, and ∆m 2 ee is the effective neutrino mass squared difference in eV 2 and defined as ∆m 2 ee ≡ cos 2 θ 12 ∆m 2 31 + sin 2 θ 12 ∆m 2 32 [10]. Recently RENO has published a letter [11] on the improved measurement of θ 13 and the first measurement of |∆m 2 ee | with a spectral shape and rate analysis using ∼500 live days of data.…”

Section: Introductionmentioning

confidence: 99%

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Spectral measurement of the electron antineutrino oscillation amplitude and frequency using 500 live days of RENO data

Seo¹,

Choi²,

Seo³

et al. 2018

Phys. Rev. D

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The Reactor Experiment for Neutrino Oscillation (RENO) has been taking electron antineutrino (ν e ) data from the reactors in Yonggwang, Korea, using two identical detectors since August 2011. Using roughly 500 live days of data through January 2013 we observe 290 775 (31 514) reactorν e candidate events with 2.8% (4.9%) background in the near (far) detector. The observed visible positron spectra from the reactorν e events in both detectors show a discrepancy around 5 MeV with regard to the prediction from the current reactorν e model. Based on a far-to-near ratio measurement using the spectral and rate information, we have obtained sin 2 2θ 13 ¼ 0.082 AE 0.009ðstat:Þ AE 0.006ðsyst:Þ and jΔm

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Section: Data Acquisitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectral measurement of the electron antineutrino oscillation amplitude and frequency using 500 live days of RENO data

Seo¹,

Choi²,

Seo³

et al. 2018

Phys. Rev. D

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“…These backgrounds are partially mitigated by continuously circulating and purifying the detector water and by supplying a layer of purified air between the top of the steel structure defining the detector and the tank water as a buffer gas [1]. Although recent upgrades to both of these systems [2] and the Super-K front end electronics [30] have resulted in an analysis energy threshold of 3.5 MeV (electron kinetic energy) [19], in order to observe the MSW spectrum distortion, the threshold must be reduced further. Currently, the threshold is limited by a few mBq/m 3 of Rn estimated to exist in the 4.0-6.0 MeV energy region of the analysis [31,32].…”

Section: Introductionmentioning

confidence: 99%

Measurement of radon concentration in super-Kamiokande’s buffer gas

Nakano

Sekiya

Tasaka

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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To precisely measure radon concentrations in purified air supplied to the Super-Kamiokande detector as a buffer gas, we have developed a highly sensitive radon detector with an intrinsic background as low as 0.33 ± 0.07 mBq/m 3 . In this article, we discuss the construction and calibration of this detector as well as results of its application to the measurement and monitoring of the buffer gas layer above Super-Kamiokande. In March 2013, the chilled activated charcoal system used to remove radon in the input buffer gas was upgraded. After this improvement, a dramatic reduction in the radon concentration of the supply gas down to 0.08 ± 0.07 mBq/m 3 . Additionally, the Rn concentration of the in-situ buffer gas has been measured 28.8±1.7 mBq/m 3 using the new radon detector. Based on these measurements we have determined that the dominant source of Rn in the buffer gas arises from contamination from the Super-Kamiokande tank itself.

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“…The detector restarted observation in June 2006, which is referred as the SK-III period. The fourth phase of SK (SK-IV) started of in September of 2008, with new front-end electronics, QBEE (QTC Based Electronics with Ethernet) [40,41] for new data acquisition system.…”

Section: Data From Various Solar Neutrino Experimentsmentioning

confidence: 99%

Investigating Sterile Neutrino Flux in the Solar Neutrino Data

Ankush

Verma

Sharma

et al. 2019

Advances in High Energy Physics

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There are compelling evidences for the existence of a fourth degree of freedom of neutrinos i.e. sterile neutrino. In the recent studies the role of sterile component of neutrinos has been found to be crucial, not only in particle physics, but also in astrophysics and cosmology. This has been proposed to be one of the potential candidates of dark matter. In this work we investigate the updated solar neutrino data available from all the relevant experiments including Borexino and KamLAND solar phase in a model independent way, and obtain bounds on the sterile neutrino component present in the solar neutrino flux. The mystery of the missing neutrinos is further deepening as subsequent experiments are coming up with their results. The energy spectrum of solar neutrinos, as predicted by Standard Solar Models (SSM), is seen by neutrino experiments at different parts as they are sensitive to various neutrino energy ranges. It is interesting to note that more than 98% of the calculated standard model solar neutrino flux lies below 1 MeV. Therefore, the study of low energy neutrinos can give us better understanding and the possibility to know about the presence of antineutrino and sterile neutrino components in solar neutrino flux. As such, this work becomes interesting as we include the data from medium energy (∼1 MeV) experiments i.e. Borexino and KamLAND solar phase. In our study we retrieve the bounds existing in literature, and rather provide more stringent limits on sterile neutrino (ν s ) flux available in solar neutrino data.

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Commissioning of the New Electronics and Online System for the Super-Kamiokande Experiment

Cited by 42 publications

References 10 publications

Spectral measurement of the electron antineutrino oscillation amplitude and frequency using 500 live days of RENO data

Spectral measurement of the electron antineutrino oscillation amplitude and frequency using 500 live days of RENO data

Measurement of radon concentration in super-Kamiokande’s buffer gas

Investigating Sterile Neutrino Flux in the Solar Neutrino Data

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