Measurement of the fluorescence quantum yield of bis-MSB

Abstract

The fluorescence quantum yield of bis-MSB, a widely used liquid scintillator wavelength shifter, was measured to study the photon absorption and re-emission processes in liquid scintillator. The re-emission process affects the photoelectron yield and distribution, especially in a large liquid scintillator detector, thus must be understood to optimize the liquid scintillator for good energy resolution and to precisely simulate the detector with Monte Carlo. In this study, solutions of different bis-MSB concentration were prepared for absorption and fluorescence emission measurements to cover a broad range of wavelengths. Harmane was used as a standard reference to obtain the absolution fluorescence quantum yield. For the first time we measured the fluorescence quantum yield of bis-MSB up to 430 nm as inputs required by Monte Carlo simulation, which is 0.926$\pm$0.053 at ${\lambda }_{\mathrm{ex}}$ = 350 nm.

arXiv comment7 pages, 6 figures

References in corpus (6)

• Observation of electron-antineutrino disappearance at Daya Bay
• Spectral measurement of electron antineutrino oscillation amplitude and frequency at Daya Bay
• Unambiguous Determination of the Neutrino Mass Hierarchy Using Reactor Neutrinos
• A side-by-side comparison of Daya Bay antineutrino detectors
• Production of Gadolinium-loaded Liquid Scintillator for the Daya Bay Reactor Neutrino Experiment
• Oxygen quenching in LAB based liquid scintillator and nitrogen bubbling model

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