Recent progress on the development of very low energy threshold high purity germanium ionization spectrometers has produced an instrument of 1.2 kg mass and excellent noise performance. The detector was installed in a low-background cryostat intended for use in a low mass, WIMP dark matter direct detection search. The integrated detector and low background cryostat achieved noise performance of 98 eV full-width half-maximum of an input electronic pulse generator peak and gamma-ray energy resolution of 1.9 keV full-width half-maximum at the 60Co gamma-ray energy of 1332 keV. This Transaction reports the thermal characterization of the low-background cryostat, specifications of the newly prepared 1.2 kg p-type point contact germanium detector, and the ionization spectroscopy – energy resolution and energy threshold – performance of the integrated system.
Revised: February 16, 2017 |
Published: December 6, 2016
Citation
Aalseth C.E., J. Colaresi, J.I. Collar, J.E. Fast, T.W. Hossbach, J.L. Orrell, and C.T. Overman, et al. 2016.A Low-Noise Germanium Ionization Spectrometer for Low-Background Science.IEEE Transactions on Nuclear Science 63, no. 6:2782-2792.PNNL-SA-116069.doi:10.1109/TNS.2016.2614431