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Information × Registration Number 0217U006558, 0116U007757 , R & D reports Title Development of detector systems for accelerator experiments and technologies for physics of accelerators popup.stage_title Head Tretyak Volodymyr Illich, Registration Date 21-09-2017 Organization Scientific Center "Institute for Nuclear Research" of National Academy of Sciences of Ukraine popup.description2 ZnMoO4 crystals of large volume (mass of ~ 1 kg ) were grown by the low-temperature-gradient Czochralski method from deeply purified molybdenum. The Zn100MoO4 crystal from the enriched 100Mo (99.5%) was grown for the first time; its mass is 0.17 kg. Three natural (~ 0.3 kg) and two enriched (~ 0.06 kg) scintillation elements were used in low-temperature studies; their characteristics are measured. Deep purification of molybdenum and recrystallization significantly improved the radioactive contamination of ZnMoO4 crystals for 228Th and 226Ra - to a level of <0.01 mBq / kg, which corresponds to the requirements of the LUMINEU project. Production of enriched crystal scintillators Zn100MoO4 of large volume is under development. Scintillation bolometric detectors Li2MoO4 with the use of the Neganov-Luke effect to amplify the signal in the light channel were designed and tested. The obtained signal-to-noise ratio is ~ 750. This makes it possible to significantly improve the signal start search with pulse shape analysis and achieve great efficiency in suppressing superimposed signals. It is demonstrated that in the Li2MoO4 scintillation bolometers using the Neganov-Luke effect, the use of the mean time method for discrimination of superimposed events reduces the level of random coincidences to ~ 5.6e-5 counts / (keV kg year), with an excellent suppression factor of 98.3% in the interval 0 - 10 ms, which corresponds to the typical time of separation in the light channel. This makes the Li2MoO4 technology compatible with a full study of the region of the inverted neutrino mass hierarchy in the next-generation neutrinoless double beta projects of the CUPID type. Product Description popup.authors А.І. Тимошенко Б.М. Кропивянський В.І. Третяк В.В. Кобичев В.М. Мокіна Д.В. Пода Д.М. Черняк Л.М. Кобичева О.В. Зуєва О.Г. Поліщук Ф.А. Даневич popup.nrat_date 2020-04-02 Close