Oxygen quenching in a LAB based liquid scintillator and the nitrogen bubbling model

Hua-Lin, Xiao; Jing-Shan, Deng; Naiyan, Wang

doi:10.1088/1674-1137/34/5/011

Cited by 21 publications

(11 citation statements)

References 12 publications

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“…At relatively low stress levels, extruded acrylic and PLA also maintained structural integrity. In PROSPECT vial tests, a nitrogen gas cover blanket was shown to reduce oxygen quenching and improve PSD, in agreement with the literature [27,28,29]. These results have informed the design of the PROSPECT detector and PROSPECT-50.…”

Section: Ej-309supporting

confidence: 85%

Performance of a segmented ⁶Li-loaded liquid scintillator detector for the PROSPECT experiment

et al. 2018

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This paper describes the design and performance of a 50 liter, two-segment 6 Li-loaded liquid scintillator detector that was designed and operated as prototype for the PROSPECT (Precision Reactor Oscillation and Spectrum) Experiment. The two-segment detector was constructed according to the design specifications of the experiment. It features low-mass optical separators, an integrated source and optical calibration system, and materials that are compatible with the 6 Li-doped scintillator developed by PROSPECT. We demonstrate a high light collection of 850±20 PE/MeV, an energy resolution of σ = 4.0±0.2% at 1 MeV, and efficient pulse-shape discrimination of low dE/dx (electronic recoil) and high dE/dx (nuclear recoil) energy depositions. An effective scintillation attenuation length of 85±3 cm is measured in each segment. The 0.1% by mass concentration of 6 Li in the scintillator results in a measured neutron capture time of τ = 42.8±0.2 µs. The long-term stability of the scintillator is also discussed. The detector response meets the criteria necessary for achieving the PROSPECT physics goals and demonstrates features that may find application in fast neutron detection.

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Section: Ej-309supporting

confidence: 85%

Performance of a segmented ⁶Li-loaded liquid scintillator detector for the PROSPECT experiment

et al. 2018

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“…The measured values have been a factor > 2 lower than expected when considering a geometrical capture efficiency of 74.6%, 96% WLS-quantum efficiency [9] and Fresnel losses. Measurements with a PMT matched the expectation, however, if reasonable transport losses were assumed.…”

Section: Theoretical Expectationsmentioning

confidence: 58%

A Wavelength-shifting Optical Module (WOM) for in-ice neutrino detectors

Hebecker

Archinger

Böser

et al. 2016

EPJ Web of Conferences

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Abstract. We report on the development status of a single-photon sensor that employs wavelength-shifting and light-guiding techniques to maximize the collection area while minimizing the dark noise rate. The sensor is tailored towards application in ice-Cherenkov neutrino detectors embedded in inert and cold, low-radioactivity and UV transparent ice as a detection medium, such as IceCube-Gen2 or MICA. The goal is to decrease the energy threshold as well as to increase the energy resolution and the vetoing capability of the neutrino telescope, when compared to a setup with optical sensors similar to those used in IceCube. The proposed sensor captures photons with wavelengths between 250 nm and 400 nm. These photons are re-emitted with wavelengths above 400 nm by a wavelength shifting coating applied to a 90 mm diameter polymer tube. The tube guides the light towards a small-diameter PMT via total internal reflection. By scaling the results from smaller laboratory prototypes, the total efficiency of the proposed detector for a Cherenkov spectrum is estimated to exceed that of a standard IceCube optical module. The status of the prototype development and the performance of its main components will be discussed.

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“…Energy deposited in the GdLS causes excitations of LAB molecules. These excitations are transferred to PPO [46] resulting in the emission of fluorescent light, primarily below 380 nm [47]. The PPO fluorescent light is absorbed and re-emitted at longer wavelength [48] by bis-MSB (wavelength shifter) according to the spectrum shown at the top of Fig.…”

Section: Optical Propertiesmentioning

confidence: 99%

A liquid scintillation detector for radioassay of gadolinium-loaded liquid scintillator for the LZ Outer Detector

Haselschwardt

Shaw

Nelson

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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We report on the design and performance of the LUX-ZEPLIN (LZ) "Screener", a small liquid scintillator detector consisting of ≈ 23 kg of LAB-based gadoliniumloaded liquid scintillator (GdLS) to be used in the LZ Outer Detector. The Outer Detector will be filled with 17.3 tonnes of GdLS and will surround the central liquid xenon time projection chamber of LZ. Its primary function will be to tag neutron events in the liquid xenon which could mimic a WIMP dark matter signal. To meet the deadtime requirements for the Outer Detector, the radioimpurity levels in the GdLS must be kept below 0.07 mBq/kg. This background level corresponds to a rate of ≈ 50 Hz above an energy threshold of 100 keV.The Screener was operated in the ultra-low-background environment of the former LUX water shield in the Davis Laboratory at the Sanford Underground Research Facility for radioassay of the GdLS. Careful selection of detector materials and use of ultralow-background PMTs allows the measurement of a variety of radioimpurities. The 14 C/ 12 C ratio in the scintillator is measured to be (2.83 ± 0.06(stat.) ± 0.01(sys.)) × 10 −17 . Use of pulse shape discrimination allows the concentration of isotopes throughout the 238 U, 235 U, and 232 Th chains to be measured by fitting the collected spectra from α and β events. We find that equilibrium is broken in the 238 U and 232 Th chains and that a significant portion of the contamination in the GdLS results from decays in the 227 Ac subchain of the 235 U series.Predictions for the singles rate in the Outer Detector are presented. The rate from radioimpurities above 100 keV in the GdLS is estimated to be 97.9 ± 6.4 Hz, with 65.5 ± 1.9 Hz resulting from α-decays.

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Oxygen quenching in a LAB based liquid scintillator and the nitrogen bubbling model

Cited by 21 publications

References 12 publications

Performance of a segmented ⁶Li-loaded liquid scintillator detector for the PROSPECT experiment

Performance of a segmented ⁶Li-loaded liquid scintillator detector for the PROSPECT experiment

A Wavelength-shifting Optical Module (WOM) for in-ice neutrino detectors

A liquid scintillation detector for radioassay of gadolinium-loaded liquid scintillator for the LZ Outer Detector

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Oxygen quenching in a LAB based liquid scintillator and the nitrogen bubbling model

Cited by 21 publications

References 12 publications

Performance of a segmented 6Li-loaded liquid scintillator detector for the PROSPECT experiment

Performance of a segmented 6Li-loaded liquid scintillator detector for the PROSPECT experiment

A Wavelength-shifting Optical Module (WOM) for in-ice neutrino detectors

A liquid scintillation detector for radioassay of gadolinium-loaded liquid scintillator for the LZ Outer Detector

Contact Info

Product

Resources

About

Performance of a segmented ⁶Li-loaded liquid scintillator detector for the PROSPECT experiment

Performance of a segmented ⁶Li-loaded liquid scintillator detector for the PROSPECT experiment