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

Abstract

The OSIRIS detector is a subsystem of the liquid scintillator filling chain of the JUNO reactor neutrino experiment. Its purpose is to validate the radiopurity of the scintillator to assure that all components of the JUNO scintillator system work to specifications and only neutrino-grade scintillator is filled into the JUNO Central Detector. The aspired sensitivity level of $$10^{-16}\hbox { g/g}$$ 10 - 16 g/g of $$^{238}\hbox {U}$$ 238 U and $$^{232}\hbox {Th}$$ 232 Th requires a large ($$\sim 20\,\hbox {m}^3$$ ∼ 20 m 3 ) detection volume and ultralow background levels. The present paper reports on the design and major components of the OSIRIS detector, the detector simulation as well as the measuring strategies foreseen and the sensitivity levels to U/Th that can be reached in this setup.

Jiangmen Underground Neutrino Observatory (JUNO): on the way to physics data

“…JUNO Monica Sisti four main steps: i) alumina column filtration, ii) distillation, iii) water extraction, and iv) steam stripping (more details in [6]). Only when the radiopurity requirements are met, as determined by the JUNO Online Scintillator Internal Radioactivity Investigation System (OSIRIS [9]), the LS will be allowed to enter the acrylic vessel.…”

Potential for a precision measurement of solar pp neutrinos in the Serappis experiment

“…A more detailed description of the detector layout and the expected performance of the OSIRIS detector can be found in Ref. [9].…”

“…The aimed sensitivity of the Pyhäsalmi setup is between R ∼ 10 −17 and 10 −18 . To go beyond that requires a detector the size of Borexino's CTF or JUNO's OSIRIS [9,15] paired with the appropriate infrastructure for LS handling. Low- 14 C LS identification could proceed in several steps: by studying the geology of oil fields, a small (liter-scale) batch of crude oil can be retrieved directly from that field and refined for use in the Pyhäsalmi setup -note that it is not necessary to produce a scintillator solvent since also alcanes mixed with a fluor will provide sufficient light yield [22].…”

“…Such an experiment, dubbed Serappis for SEarch for RAre PP neutrinos In Scintillator, could be realized as an upgrade of the OSIRIS pre-detector of the JUNO experiment. OSIRIS' primary purpose is the investigation of the radiopurity of the JUNO liquid scintillator [7,9]. As will be explained in more detail in Sect.…”

JUNO sensitivity to low energy atmospheric neutrino spectra

“…Shuxian Du 37 Katherine Dugas 74 Stefano Dusini 60 Hongyue Duyang 26 Jessica Eck 54 Timo Enqvist 42 Andrea Fabbri 64 Ulrike Fahrendholz 52 Lei Fan 11 Jian Fang 11 Wenxing Fang 11 Marco Fargetta 55 Dmitry Fedoseev 67 Zhengyong Fei 11 Li-Cheng Feng 38 Qichun Feng 22 Federico Ferraro 57 Amélie Fournier 44 Haonan Gan 32 Feng Gao 48 Alberto Garfagnini 61 Arsenii Gavrikov 61,60 Marco Giammarchi 57 Nunzio Giudice 55 Maxim Gonchar 67 Guanghua Gong 14 Hui Gong 14 Yuri Gornushkin 67 Alexandre Göttel 50,48 Marco Grassi 61 Maxim Gromov 69 Vasily Gromov 67 Minghao Gu 11 Xiaofei Gu 37 Yu Gu 20 Mengyun Guan 11 Yuduo Guan 11 Nunzio Guardone 55 Cong Guo 11 Wanlei Guo 11 Xinheng Guo 9 Caren Hagner 49 Ran Han 8 Yang Han 21 Miao He 11 Wei He 11 Tobias Heinz…”