TY  - JOUR
T1  - Refractive index in the JUNO liquid scintillator
AU  - Zhang, H.S.
AU  - Beretta, M.
AU  - Cialdi, S.
AU  - Yang, C.X.
AU  - Huang, J.H.
AU  - Ferraro, F.
AU  - Cao, G.F.
AU  - Reina, G.
AU  - Deng, Z.Y.
AU  - Suerra, E.
AU  - Altilia, S.
AU  - Antonelli, V.
AU  - Basilico, D.
AU  - Brigatti, A.
AU  - Caccianiga, B.
AU  - Giammarchi, M.G.
AU  - Landini, C.
AU  - Lombardi, P.
AU  - Miramonti, L.
AU  - Percalli, E.
AU  - Ranucci, G.
AU  - Re, A.C.
AU  - Saggese, P.
AU  - Torri, M.D.C.
AU  - Aiello, S.
AU  - Andronico, G.
AU  - Barresi, A.
AU  - Bergnoli, A.
AU  - Borghesi, M.
AU  - Brugnera, R.
AU  - Bruno, R.
AU  - Budano, A.
AU  - Cammi, A.
AU  - Cerrone, V.
AU  - Caruso, R.
AU  - Chiesa, D.
AU  - Clementi, C.
AU  - Dusini, S.
AU  - Fabbri, A.
AU  - Felici, G.
AU  - Garfagnini, A.
AU  - Giudice, N.
AU  - Gavrikov, A.
AU  - Grassi, M.
AU  - Guizzetti, R.M.
AU  - Guardone, N.
AU  - Jelmini, B.
AU  - Lastrucci, L.
AU  - Lippi, I.
AU  - Loi, L.
AU  - Lombardo, C.
AU  - Mantovani, F.
AU  - Mari, S.M.
AU  - Martini, A.
AU  - Montuschi, M.
AU  - Nastasi, M.
AU  - Orestano, D.
AU  - Ortica, F.
AU  - Paoloni, A.
AU  - Petrucci, F.
AU  - Previtali, E.
AU  - Redchuck, M.
AU  - Ricci, B.
AU  - Romani, A.
AU  - Sava, G.
AU  - Serafini, A.
AU  - Sirignano, C.
AU  - Sisti, M.
AU  - Stanco, L.
AU  - Farilla, E. Stanescu
AU  - Strati, V.
AU  - Triossi, A.
AU  - Tuve’, C.
AU  - Venettacci, C.
AU  - Verde, G.
AU  - Votano, L.
JO  - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
VL  - 1068
SP  - 169730
PY  - 2024
DA  - 2024/11/01/
SN  - 0168-9002
DO  - https://doi.org/10.1016/j.nima.2024.169730
UR  - https://www.sciencedirect.com/science/article/pii/S0168900224006569
KW  - Refractive index
KW  - Linear alkyl benzene
KW  - Cherenkov light
KW  - Scintillator
KW  - Neutrino physics
KW  - JUNO experiment
AB  - In the field of rare event physics, it is common to have huge masses of organic liquid scintillator as detection medium. In particular, they are widely used to study neutrino properties or astrophysical neutrinos. Thanks to its safety properties (such as low toxicity and high flash point) and easy scalability, linear alkyl benzene is the most common solvent used to produce liquid scintillators for large mass experiments. The knowledge of the refractive index is a pivotal point to understand the detector response, as this quantity (and its wavelength dependence) affects the Cherenkov radiation and photon propagation in the medium. In this paper, we report the measurement of the refractive index of the JUNO liquid scintillator between 260–1064 nm performed with two different methods to cover wide range of refractive index (an ellipsometer and a refractometer), with a sub percent level precision. In addition, we used an interferometer to measure the group velocity in the JUNO liquid scintillator and verify the expected value derived from the refractive index measurements.
ER  -