-containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2–0.4 kg scintillating bolometers.
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.
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.
Scintillating bolometers, the devices used in the present work, are favorable nuclear detectors for the conduction of sensitive ]: large enough crystal boule size; limited losses of the high-cost enriched isotope in the purification-crystallization chain; good optical properties; high scintillation yield; exceptionally low radioactive contamination.
The size of a boule should be enough to produce at least one crystals have a reasonable scintillation yield, at the level of 1 ke V/Me V, which do not require ultra-low-noise bolometric light detectors.
A short description of the used underground cryogenic set-ups.
The rock overburden is expressed in km of water equivalent (km w.e.).
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 standard adopted by LUMINEU for the EDELWEISS-III set-up implies the use of a dedicated copper holder where the crystal scintillator is fixed by means of L- and S-shaped PTFE clamps [, the holders were slightly modified to make the array structure able to pass through the holes in the copper plates of the EDELWEISS set-up.
A large group of interest is proposing a next-generation bolometric experiment, CUORE Upgrade with Particle ID (CUPID) [ candidates considered for CUPID.