Optimization of the JUNO liquid scintillator composition using a Daya Bay antineutrino detector

Abstract

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Cherenkov and scintillation separation in water-based liquid scintillator using an LAPPDTM

“…This work considers three samples of WbLS, formed by combining linear alkylbenzene (LAB) and 2,5 diphenyloxazole (PPO), a common solvent-fluor pair in neutrino detectors [47,48], with water. It is a candidate target material for upcoming optical detectors, including ANNIE [36], AIT-NEO [37], and Theia [38].…”

Radioactivity control strategy for the JUNO detector

“…In the CD, the JHEP11(2021)102 huge LS mass -20 kt -is contained inside a spherical acrylic vessel with inner diameter of 35.40 m and thickness of 12 cm, for a total mass of about 580 t of acrylic. The LS target has a room temperature density of 0.86 g/mL and consists of Linear Alkyl Benzene (LAB) solvent, mixed with 2.5 g/L of PPO (2,5-dyphenyloxazole) as fluor and 3 mg/L bis-MSB (1,4-bis(2-methylstyryl) benzene) as a wavelength shifter [4]. The vessel is supported by a spherical stainless steel (SS) structure with inner diameter of 40.1 m, sitting on 30 pairs of SS legs safely rooted to the concrete floor of the water pool.…”

“…The parameter S is a normalization factor which gives the scintillation efficiency. In the Birks model, only a fraction of the energy deposited in the LS by the ionizing particle is actually transferred to the fluorescent molecule (2.5 g/L of PPO for JUNO [4]) and ready to be converted in scintillation light, a fact that is usually referred to as ionization quenching of the light yield. Table 2 reports the Birks' coefficients used for the present JUNO simulations, inherited from Daya Bay experience [23].…”

The design and sensitivity of JUNO’s scintillator radiopurity pre-detector OSIRIS

“…The JUNO scintillator is based on linear alkylbenzene (LAB) produced by Nanjing company (product: special LAB). The primary fluor is 2,5-diphenyloxazole (PPO) added at a concentration of 2.5 g/l, with p-bis-(o-methylstyryl)-benzene (Bis-MSB) as wavelength shifter at 3 mg/l [2]. The expected scintillator performance is reported in Sect.…”