Dunkle Materie und WIMPS?
Verfasst: 14. Apr 2011, 08:13
Vom Team am XENON100 am Gran Sasso Labor wurden die Ergebnisse eines 100-Tags Runs analysiert und jetzt veröffentlicht. Dabei werden erneut deutliche Constraints für die Existenz bzw. Eigenschaften von WIMPS bzw. generell Teilchen der Dunklen Materie postuliert. Natürlich kann man mit einem derartigen Detektor nicht die Existenz der DM selbst ausschließen, sondern nur die Stärke der WW mit normaler Materie, aber das wiederum führt zu Erkenntnissen bzgl. der möglichen Wechselwirkungsstruktur sowie generell der theoretischen Modelle für die DM (z.B. SUSY). Am Gran Sasso wurden bereits Experimente zu Neutrino-Oszillationen durchgeführt sowie Experimente, die letztlich dazu geführt haben, dass die SU(5) und SO(10) GUTs verworfen werden mussten.
http://xenon.physics.rice.edu/
http://arxiv.org/abs/1104.2549
Dark Matter Results from 100 Live Days of XENON100 Data
Authors: XENON100 Collaboration: ...
(Submitted on 13 Apr 2011)
Abstract: We present results from the direct search for dark matter with the XENON100 detector, installed underground at the Laboratori Nazionali del Gran Sasso of INFN, Italy. XENON100 is a two-phase time projection chamber with a 62 kg liquid xenon target. Interaction vertex reconstruction in three dimensions with millimeter precision allows to select only the innermost 48 kg as ultra-low background fiducial target. In 100.9 live days of data, acquired between January and June 2010, no evidence for dark matter is found. Three candidate events were observed in a pre-defined signal region with an expected background of 1.8 +/- 0.6 events. This leads to the most stringent limit on dark matter interactions today, excluding spin-independent elastic WIMP-nucleon scattering cross-sections above 7.0x10^-45 cm^2 for a WIMP mass of 50 GeV/c^2 at 90% confidence level.
This result excludes a large fraction of previously unexplored WIMP parameter space, and cuts into the region where supersymmetric WIMP dark matter is accessible
by the LHC [17]. Moreover, the new result challenges the interpretation of the DAMA [19] and CoGeNT [18] results as being due to light mass WIMPs.
http://xenon.physics.rice.edu/
http://arxiv.org/abs/1104.2549
Dark Matter Results from 100 Live Days of XENON100 Data
Authors: XENON100 Collaboration: ...
(Submitted on 13 Apr 2011)
Abstract: We present results from the direct search for dark matter with the XENON100 detector, installed underground at the Laboratori Nazionali del Gran Sasso of INFN, Italy. XENON100 is a two-phase time projection chamber with a 62 kg liquid xenon target. Interaction vertex reconstruction in three dimensions with millimeter precision allows to select only the innermost 48 kg as ultra-low background fiducial target. In 100.9 live days of data, acquired between January and June 2010, no evidence for dark matter is found. Three candidate events were observed in a pre-defined signal region with an expected background of 1.8 +/- 0.6 events. This leads to the most stringent limit on dark matter interactions today, excluding spin-independent elastic WIMP-nucleon scattering cross-sections above 7.0x10^-45 cm^2 for a WIMP mass of 50 GeV/c^2 at 90% confidence level.
This result excludes a large fraction of previously unexplored WIMP parameter space, and cuts into the region where supersymmetric WIMP dark matter is accessible
by the LHC [17]. Moreover, the new result challenges the interpretation of the DAMA [19] and CoGeNT [18] results as being due to light mass WIMPs.