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We introduce high-resolution solid-state imaging detectors for the search ofneutrinoless double $\beta$ decay. Based on the present literature, imagingdevices from amorphous $^{82}$Se evaporated on a complementarymetal-oxide-semiconductor (CMOS) active pixel array could have the energy andspatial resolution to produce two-dimensional images of ionizing tracks ofutmost quality, effectively akin to an electronic bubble chamber in the double$\beta$ decay energy regime. Still to be experimentally demonstrated, adetector consisting of a large array of these devices could have very lowbackgrounds, possibly reaching $10^{-7}$/(kg y) in the neutrinoless decayregion of interest (ROI), as it may be required for the full exploration of theneutrinoless double $\beta$ decay parameter space in the most unfavorablecondition of a strongly quenched nucleon axial coupling constant.

A high-resolution CMOS imaging detector for the search of neutrinoless double $\beta$ decay in $^{82}$Se