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Experiments searching for rare events, such as neutrinoless double beta decayand interactions of dark matter candidates, require extremely low levels ofbackground. When these experiments are performed using macro-bolometers,radioactive contamination near the surfaces is of particular concern. In orderto control the effects of surface contamination, we developed a novel techniquethat uses composite macro-bolometers to identify energy depositions that occurclose to the surfaces of materials immediately surrounding the detector. Thecomposite macro-bolometer proposed and studied here consists of a main energyabsorber that is thermally coupled to and entirely surrounded by thin absorbersthat act as active shields. Surface energy depositions can be rejected by theanalysis of simultaneous signals in the main absorber and the shields. In thispaper, we describe a full thermal model and experimental results for threeprototype detectors. The detectors consist of Ge, Si, or TeO2 thin absorbers asactive shields, all with TeO2 crystals as main absorbers. In all cases, thesurface event rejection capability is clearly demonstrated. In addition,simulations and preliminary results show that it is possible to detect energydepositions that occurred on the shields without separate readout channels forthem. The energy depositions in the shields are distinguished from those in themain absorber through pulse shape discrimination. This simplification makesthis technique a viable method for the rejection of surface energy depositionsin next-generation bolometric double beta decay searches, such as possibleextensions or upgrades of the CUORE experiment.

Composite macro-bolometers for the rejection of surface radioactive background in rare-event experiments