Pulse Shape Analysis with scintillating bolometers

Abstract

Among the detectors used for rare event searches, such as neutrinoless Double Beta Decay (0$\nu$DBD) and Dark Matter experiments, bolometers are very promising because of their favorable properties (excellent energy resolution, high detector efficiency, a wide choice of different materials used as absorber, ...). However, up to now, the actual interesting possibility to identify the interacting particle, and thus to greatly reduce the background, can be fulfilled only with a double read-out (i.e. the simultaneous and independent read out of heat and scintillation light or heat and ionization). This double read-out could greatly complicate the assembly of a huge, multi-detector array, such as CUORE and EURECA. The possibility to recognize the interacting particle through the shape of the thermal pulse is then clearly a very interesting opportunity. While detailed analyses of the signal time development in purely thermal detectors have not produced so far interesting results, similar analyses on macro-bolometers ($\sim$10-500 g) built with scintillating crystals showed that it is possible to distinguish between an electron or $\gamma$-ray and an $\alpha$ particle interaction (i.e. the main source of background for 0$\nu$DBD experiments based on the bolometric technique). Results on pulse shape analysis of a CaMoO${}_4$ crystal operated as bolometer is reported as an example. An explanation of this behavior, based on the energy partition in the heat and scintillation channels, is also presented.

Presented at the 14th International Workshop on Low Temperature Detectors, proceedings to be published in the Journal of Low Temperature Physics

References in corpus (7)

• Double Beta Decay, Majorana Neutrinos, and Neutrino Mass
• Performance of scintillation materials at cryogenic temperatures
• Performance of ZnMoO4 crystal as cryogenic scintillating bolometer to search for double beta decay of molybdenum
• CdWO4 scintillating bolometer for Double Beta Decay: Light and Heat anticorrelation, light yield and quenching factors
• Characterization of ZnSe scintillating bolometers for Double Beta Decay
• A novel technique of particle identification with bolometric detectors
• Scintillating bolometers for Double Beta Decay search

Cited by in corpus (5)

• Performances of a large mass ZnSe bolometer to search for rare events
• Performances of a large mass ZnMoO4 scintillating bolometer for a next generation neutrinoless double beta decay experiment
• ZnMoO4: a promising bolometer for neutrinoless double beta decay searches
• Potentialities of the future technical improvements in the search of rare nuclear decays by bolometers
• Modeling high impedance connecting links and cables below 1 Hz