Separation of scintillation and Cherenkov lights in linear alkyl benzene

Li, Mohan; Guo, Ziyi; Yeh, M.; Wang, Zhe; Chen, Shaomin

doi:10.1016/j.nima.2016.05.132

Cited by 61 publications

(53 citation statements)

References 26 publications

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“…This work found that the slow component of an exponential decay of the scintillation is stronger pronounced at lower temperatures. As the triplet lifetime of benzene matches this slow decay component well [21][22][23][24], this result can be seen as an indication that either more triplet states are populated or that the radiative de-excitation of those is more efficient at lower temperatures. The increased population would fit into the theory of Birks and Conte [9,25], who proposed that the energy transfer between solvent-solvent and solvent-solute molecules is mainly due to excimer formation.…”

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confidence: 66%

Temperature quenching in LAB based liquid scintillator

et al. 2018

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The effect of temperature changes on the light output of LAB based liquid scintillator is investigated in a range from −5 to 30 • C with α-particles and electrons in a small scale setup. Two PMTs observe the scintillator liquid inside a cylindrically shaped aluminum cuvette that is heated or cooled and the temperature dependent PMT sensitivity is monitored and corrected. The α-emitting isotopes in dissolved radon gas and in natural Samarium (bound to a LAB solution) excite the liquid scintillator mixtures and changes in light output with temperature variation are observed by fitting light output spectra. Furthermore, also changes in light output by compton electrons, which are generated from external calibration γ -ray sources, is analysed with varying temperature. Assuming a linear behaviour, a combined negative temperature coefficient of (−0.29 ± 0.01) %/ • C is found. Considering hints for a particle type dependency, electrons show (−0.17 ± 0.02) %/ • C, whereas the temperature dependency seems stronger for α-particles, with (−0.35 ± 0.03) %/ • C. Due to a high sampling rate, a pulse shape analysis can be performed and shows an enhanced slow decay component at lower temperatures, pointing to reduced non-radiative triplet state de-excitations.

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confidence: 66%

Temperature quenching in LAB based liquid scintillator

et al. 2018

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“…With this detection material, Cherenkov light as a prompt component can be separated with a fast readout system. Linear alkylbenzene (LAB), as the primary component or ingredient of liquid scintillators, was studied [3], and its light yield is about 1000 photons/MeV and emission decay time is about 37 ns. Slow liquid scintillator samples with higher light yield were searched with LAB, 2,5-diphenyloxazole (PPO) and p-bis-(o-methylstyryl)-benzene (bis-MSB) combinations [4].…”

Section: Research and Design Progress Slow Liquid Scintillatormentioning

confidence: 99%

Research and design progress of the Jinping Neutrino Experiment

Wang¹

2018

AIP Conference Proceedings

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Abstract. Thanks to the 2400 m overburden and the long distance to commercial reactors, the China Jinping Underground Laboratory (CJPL) is an ideal site for low background neutrino experiments. The Jinping Neutrino Experiment will perform an in-depth research on solar neutrinos, geo-neutrinos and supernova relic neutrinos. Many efforts were devoted to the R&D of the experimental proposal. A new type of liquid scintillator, with high light-yield and Cherenkov and scintillation separation capability, is being developed. The assay and selection of low radioactive stainless-steel (SST) was carried out. A wide field-of-view of 90 degree and high-geometry-efficiency of 98% light concentrator is developed. At the same time, a 1-ton prototype is constructed and placed underground at Jinping laboratory. The simulation and analysis software, electromagnetic calorimeter function, rock damage zone simulation will also be introduced briefly.

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“…Additionally, the angular distribution of the Cherenkov light around the event direction distinguishes it from isotropic scintillation light. Benchtop scale experimental setups, such as in [21][22][23][24][25], use the timing and directionality to identify the Cherenkov light.…”

Section: Introductionmentioning

confidence: 99%

Spectral photon sorting for large-scale Cherenkov and scintillation detectors

et al. 2020

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We describe here measurements with a new device, the "dichroicon," a Winston-style light concentrator built out of dichroic reflectors, which could allow large-scale neutrino detectors to sort photons by wavelength with small overall light loss. Photon sorting would benefit large-scale water or ice Cherenkov detectors such as Hyper-Kamiokande or ICECUBE by providing a measure of dispersion, which in turn could allow improved position reconstruction and timing. For scintillator detectors like JUNO, upgrades to SNO+ or KamLAND-ZEN, or to water-based liquid scintillator detectors like Theia, dichroicons would provide effective discrimination between Cherenkov and scintillation light, allowing them to operate as true hybrid detectors. Dichroicons are useful for wavelength discrimination in any photon-starved environment in which detection area is limited.We include measurements with a prototype dichroicon using first a Cherenkov source to show spectral photon sorting works as expected. We then present measurements of two different LAB-based liquid scintillator sources, and demonstrate discrimination between Cherenkov and scintillation light. On the benchtop we can identify Cherenkov light with better than 90% purity while maintaining a high collection efficiency for the scintillation light. First results from simulations of a large-scale detector are also presented.

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Separation of scintillation and Cherenkov lights in linear alkyl benzene

Cited by 61 publications

References 26 publications

Temperature quenching in LAB based liquid scintillator

Temperature quenching in LAB based liquid scintillator

Research and design progress of the Jinping Neutrino Experiment

Spectral photon sorting for large-scale Cherenkov and scintillation detectors

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