University of Minnesota
School of Physics & Astronomy

Cosmology Lunchtime Seminar

Monday, September 17th 2018
12:15 pm:
Speaker: Matt Fritts, University of Minnesota
Subject: Detector R&D for SuperCDMS

SuperCDMS is a direct-detection dark matter search employing cryogenic semiconductor detectors. One focus for SuperCDMS is low-mass WIMPs that would deposit very low energies in a detector; thus the detectors are designed for low energy thresholds and high energy resolution. Recent R&D efforts have taken resolution to the limit of single electron-hole pairs produced by ionizing events. WIMP searches with low-threshold detectors depend on the ionization yield for nuclear-recoil events, which is not well known at such low energies. One attempt to measure this is based on neutron capture. If WIMPs turn out to have high masses, then high exposures become important, and larger detectors will be needed. Recently 150mm-diameter CDMS-style detectors have been made and tested. I will report on our R&D efforts in each of these areas.

Faculty Host: Vuk Mandic

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