BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:A concept of neutrino scintillation detector with threshold below 1 keV DTSTART;VALUE=DATE-TIME:20241025T074000Z DTEND;VALUE=DATE-TIME:20241025T075500Z DTSTAMP;VALUE=DATE-TIME:20260612T231238Z UID:indico-contribution-4193@cern.ch DESCRIPTION:Speakers: Alexander Strizhak (Institute for Nuclear Research o f the Russian Academy of Sciences(RU)\, MIPT)\nA modular SrI2(Eu) scintill ation ultra-low energy threshold neutrino detector is being developed in I NR RAS to research low energy neutrinos produced in radioactive isotope de cays and also reactor neutrinos. Proposed layer structure of the detector allows to easily scale it depending on the task. Each layer will consist o f 16 modules\, each comprising 4 scintillation crystals. Readout of each c rystal is done by a SiPM matrix. In this work\, performance of SrI2(Eu) sc intillation detectors will be discussed. The light yield of SrI2(Eu) scint illator can reach up to 120 p.e./keV. SiPMs with high photon detection eff iciency (PDE) of around 50% can be used to lower the threshold down to ~10 0 eV. SrI2(Eu) emission spectrum aligns well with SiPM maximum PDE. It wil l be shown that Dark Current Rate (DCR)\, which is the main disadvantage o f utilizing SiPMs for low threshold measurements\, is suppressed at temper atures below -60°C. DCR of several SiPM matrixes was tested in a broad te mperature range for various operating voltages. The measurements show sati sfactory light yield of tested SrI2(Eu) scintillation detector prototypes. Preliminary results of scintillation detectors confirm the ability to det ect recoil electrons with energy below 1 keV. A developed coincidence sche me and single electron counting regime should allow to decrease noise rate and to detect events with the discussed threshold of 100 eV.\n\nhttps://i ndico.particle.mephi.ru/event/436/contributions/4193/ LOCATION: Moskvorechye 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4193/ END:VEVENT END:VCALENDAR