Demonstration of the CDMS II ZIP technology at a shallow underground site

Abstract

The most recent CDMS data run (Run 20) was the first run in which multiple ZIP detectors were deployed. Three Si (0.100 kg each) and 3 Ge (0.250 kg each) ZIPs were run with the goals of fully testing such a configuration as well as measuring the γ , β , and n rates simultaneously with Ge and Si detectors. Calibration with γ and n sources established the bulk electron recoil leakage into the neutron band to be less that 0.2%. Low background data taken during the summer of 2000 produced a simultaneous measurement of the muon coincident neutron background with Si and Ge detectors.

A testing strategy for the mass production of CDMS II detectors

“…We have recently completed the first data-taking run using these new ZIP (Zsensitive Ionization and Phonon) detectors [1]. These detectors are 1-cm-thick, 7-cmdiameter crystals of either germanium or silicon with one face of the detector instrumented to detect ionization energies and the other side instrumented to detect phonon energies.…”