I will introduce a new technology of detectors for the search of the neutrinoless double β decay of 82Se. Based on the present literature, imaging devices from amorphous 82Se evaporated on a complementary metal-oxide-semiconductor (CMOS) active pixel array are expected to have the energy and spatial resolution to produce two-dimensional images of ionizing tracks of utmost quality, effectively akin to an electronic bubble chamber in the double β decay energy regime. Still to be experimentally demonstrated, a detector consisting of a large array of these devices could have very low backgrounds, possibly reaching 1 × 10−7/(kg y) in the neutrinoless decay region of interest (ROI), as it may be required for the full exploration of the neutrinoless double β decay parameter space in the most unfavorable condition of a normal hierarchy of neutrino masses and of a strongly quenched nucleon axial coupling constant.
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