Title :
Simultaneous measurement of thermal and ionization signals in a 60 g cryogenic germanium detector
Author :
Barnes, P.D. ; Da Silva, Alzennyr ; Ellman, B. ; Emes, J. ; Haller, Eugene E. ; Lange, A.E. ; Ing, K. ; Ross, R.R. ; Sadoulet, B. ; Shutt, T. ; Smith, G. ; Stubbs, C. ; Wang, N. ; White, S. ; Yvon, D.
Author_Institution :
Dept. of Phys., California Univ., Berkeley, CA, USA
Abstract :
The authors present new results from a cryogenic detector instrumented to measure both the phonon and ionization signals in a 60 g Ge disk operated at 30 mK. Significant improvements in the electronics noise, threshold, and energy resolution of the device have been made. The baseline full width at half maximum (FWHM) corresponding to total system noise, is 1.55 keV in the phonon channel and 1.59 keV in the ionization channel. At 60 keV the FWHM is 1.9 keV and 1.7 keV in the phonon and ionization channels, respectively. A discrimination between electron recoils and nuclear recoils at low energy has been demonstrated.<>
Keywords :
semiconductor counters; semiconductor device noise; 1.55 to 1.9 keV; 30 mK; 60 g; FWHM; cryogenic Ge detector; electron recoils; energy resolution; full width at half maximum; ionization signals; noise; nuclear recoils; phonon; threshold; Cryogenics; Detectors; Electromagnetic scattering; Electrons; Energy resolution; Extraterrestrial measurements; Germanium; Ionization; Particle scattering; Phonons;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE
Conference_Location :
Santa Fe, NM, USA
Print_ISBN :
0-7803-0513-2
DOI :
10.1109/NSSMIC.1991.258920
