The status of the EDELWEISS experiment, installed in the Fréjus tunnel, is presented. In its first stage, the experiment uses a 70 g high purity Ge bolometer with heat-ionization discrimination. Based on physics data, gamma and neutron calibrations, the influence of inverse bias voltage (−2 and −6 V) on incomplete surface charge collection, which limits at present the performances of these detectors, is presented. Analysing runs with a total exposure of 1.17 kg×day after cuts, an upper limit of 0.6 event day kg keV at 90% confidence level in the 12–70 keV recoil energy interval is obtained. Planned upgrades are summarized.
|Titolo:||Status of the EDELWEISS experiment|
|Parole Chiave:||edelweiss ; dark matter ; bolometer|
|Data di pubblicazione:||dic-1998|
|Digital Object Identifier (DOI):||10.1016/S0370-1573(98)00075-1|
|Appare nelle tipologie:||01 - Articolo su periodico|