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The masses of all used NTD sensors are -enriched crystal boule grown at the beginning of 2016.
The crystal was produced by a triple crystallization due to an accident that happened during the second crystal growth process.
Their IDs coincide with the scintillation crystal IDs defined above.
Three types of reflectors were used: Radiant Mirror Film (RMF) VM2000/VM2002 and Enhanced Specular Reflector (ESR) film by 3M™and a thin silver layer (Ag) deposited on the holder.
The mechanical structure and the optical coupling to the crystal scintillators are designed to optimize the heat flow through the sensors and to maximize the light collection.
The sampling rate is given in kilo-samples per sec (k SPS ) , an efficient suppression of the cosmic-ray flux is provided by a deep underground location of both set-ups.
Non-conservation of the total lepton number is as important as baryon number violation and is naturally incorporated by many theories beyond the Standard Model (SM). The goal of these future searches is to improve by up to two orders of magnitude the present best limits on the half-life with a sensitivity to the effective Majorana neutrino mass (a measure of the absolute neutrino mass scale) at the level of 10–20 me V, covering the so-called inverted hierarchy region of the neutrino mass pattern.
The bolometric approach is amongst the most powerful methods to investigate decay experiment, is now taking data in the Gran Sasso National Laboratories (Italy) and will be in operation for several years.
The crystal ID is represented by the abbreviation of the chemical compound with an extra “enr” to mark enriched samples and/or “t” or “b” to indicate the position in the boule and a number to distinguish boules of the same material scintillators included the radioactive screening and selection of commercial lithium carbonate samples, the optimization of the LTG Cz crystal growth and the investigation of the segregation of radioactive elements in the crystallization process.
Three samples of high purity lithium carbonate were measured by HPGe spectrometry at the STELLA facility of the Gran Sasso underground laboratory (Italy): (1) 99.99% purity grade powder produced by Novosibirsk Rare Metal Plant (NRMP, Novosibirsk, Russia) [-containing heat detectors studied in the present work.
Both scintillation elements were cut from the top part of the boules.