- Feb. 24, 2022, 1:00 pm US/Central
We are pleased to host Prof. Alvaro Chavarria from the University of Washington who will talk about ‘’The Selena Neutrino Experiment’’.
Imaging devices made from an ionization target layer of amorphous selenium (aSe) coupled to a silicon complementary metal-oxide-semiconductor (CMOS) active pixel array for charge readout are a promising technology for neutrino physics. The high spatial resolution in a solid-state target provides unparalleled rejection of backgrounds from natural radioactivity in the search for neutrinoless double beta decay and for solar neutrino spectroscopy with Se-82. We present results on the ionization response of aSe measured from the photoabsorption of 122 keV gamma rays in a single-pixel device, and report on the progress in the fabrication and testing of the first prototype imaging devices based on the Topmetal-II pixelated CMOS charge sensor. We explore the scientific reach of a large neutrino detector with the proposed technology based on our experimental understanding of the device performance.