84 research outputs found
Waveform Reconstruction of IBD and Muon Events in JUNO
No full textThe JUNO (Jiangmen Underground Neutrino Observatory) experiment is a multi-purpose neutrino experiment currently under construction in Jiangmen, China. The primary goal is to determine the neutrino mass hierarchy by measuring reactor antineutrinos at a baseline of 53 km. The 20 kton liquid-scintillator detector aims at achieving an outstanding energy resolution of 3%/E(MeV)‾‾‾‾‾‾‾‾√
\sqrt{E\text{(MeV)}}
of Inverse Beta Decay (IBD) events. Hence, the charge and arrival times of individual photons have to be reconstructed with great precision. Furthermore, the suppression of the cosmic muon background is performed by a partial volume veto depending on the first hit time and charge of the muon signals. The IBD waveform study is based on the deconvolution method, which unfolds the photo-electron hit pattern and the single photo-electron response. The results of IBD photo-electron reconstruction and the reconstruction of the first hit time of muons and the corresponding charge are presented
The Jiangmen Underground Neutrino Observatory
No full textThe Jiangmen Underground Neutrino Observatory (JUNO) is a next generation multi-purpose antineutrino detector currently under construction in Jiangmen, China. The central detector contains 20 kton of liquid scintillator and is equipped with 18,000 20 inch and 25,000 3 inch PMTs. The surrounding water pool serves as Cherenkov veto detector allowing muon track reconstruction for a partial volume veto of the central detector. Measuring reactor antineutrinos of two powerplants at a baseline of 53 km, the unprecedented design energy resolution is 3% at 1 MeV. The main physics goal is to determine the neutrino mass hierarchy within six years of run time with a significance of 3-4 sigma. Additional physics goals are the precise measurement of the solar neutrinos, geo-neutrinos, supernova burst neutrinos, the diffuse supernova neutrino background as well as the search for proton decays. Data taking is expected to start in 2021. This talk reviews the current status of the project and the physics goals. Furthermore, the contributions of the German collaboration groups are summarized
Suitability test of the Time-of-Flight Method in View of the Energy Resolution of Protons with WASA-at-COSY
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Towards Measuring the Electromagnetic Structure of η’ Mesons with the CLAS g12 Experiment
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Muon reconstruction with a geometrical model in JUNO
No full textThe Jiangmen Neutrino Underground Observatory (JUNO) is a 20 kton liquid scintillator detector currently under construction near Kaiping in China. The physics program focuses on the determination of the neutrino mass hierarchy with reactor anti-neutrinos. For this purpose, JUNO is located 650 m underground with a distance of 53 km to two nuclear power plants. As a result, it is exposed to a muon flux that requires a precise muon reconstruction to make a veto of cosmogenic backgrounds viable. Established muon tracking algorithms use time residuals to a track hypothesis. We developed an alternative muon tracking algorithm that utilizes the geometrical shape of the fastest light. It models the full shape of the first, direct light produced along the muon track. From the intersection with the spherical PMT array, the track parameters are extracted with a likelihood fit. The algorithm finds a selection of PMTs based on their first hit times and charges. Subsequently, it fits on timing information only. On a sample of through-going muons with a full simulation of readout electronics, we report a spatial resolution of 20 cm of distance from the detector's center and an angular resolution of 1.6o over the whole detector. Additionally, a dead time estimation is performed to measure the impact of the muon veto. Including the step of waveform reconstruction on top of the track reconstruction, a loss in exposure of only 4% can be achieved compared to the case of a perfect tracking algorithm. When including only the PMT time resolution, but no further electronics simulation and waveform reconstruction, the exposure loss is only 1%
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