Indium-loaded Liquid Scintillator for the Low Energy Neutrino Spectrometer (LENS)*

The Chemistry Department at Brookhaven National Laboratory has a long history of neutrino research since Ray Davis's Homestake experiment. The Solar Neutrino and Nuclear Chemistry group has been successfully building large neutrino detectors over the past decade for various physics experiments, using tens to hundreds of tons of liquid scintillator. Among them, LENS aims to use 8{\%} indium-loaded LS (In-LS, first investigated by Raghavan in the 1970s) for a real-time measurement of over 95{\%} of sub-MeV solar neutrinos, mainly from pp-, CNO-, and $^{7}$Be-processes. A nearly background-free spectral image from neutrino interactions on $^{115}$In can be obtained via a triple coincidence tag in space and time. LENS detector R{\&}D has made major progress in the recent years. The development of In-LS, in collaboration with Virginia Tech, now meets the challenging requirements of light yield, optical clarity, and chemical stability; and the collaboration is in the process of building a 410-L prototype (\textit{mini}LENS). In this talk, the preparation and properties of In-LS for the \textit{mini}LENS detector will be presented.