24 research outputs found
Performance of a cryogenic system prototype for the XENON1T Detector
We have developed an efficient cryogenic system with heat exchange and
associated gas purification system, as a prototype for the XENON1T experiment.
The XENON1T detector will use about 3 ton of liquid xenon (LXe) at a
temperature of 175K as target and detection medium for a dark matter search. In
this paper we report results on the cryogenic system performance focusing on
the dynamics of the gas circulation-purification through a heated getter, at
flow rates above 50 Standard Liter per Minute (SLPM). A maximum flow of 114
SLPM has been achieved, and using two heat exchangers in parallel, a heat
exchange efficiency better than 96% has been measured
Loop-induced dark matter direct detection signals from gamma-ray lines
Improved limits as well as tentative claims for dark matter annihilation into
gamma-ray lines have been presented recently. We study the direct detection
cross section induced from dark matter annihilation into two photons in a
model-independent fashion, assuming no additional couplings between dark matter
and nuclei. We find a striking non-standard recoil spectrum due to different
destructively interfering contributions to the dark matter nucleus scattering
cross section. While in the case of s-wave annihilation the current sensitivity
of direct detection experiments is insufficient to compete with indirect
detection searches, for p-wave annihilation the constraints from direct
searches are comparable. This will allow to test dark matter scenarios with
p-wave annihilation that predict a large di-photon annihilation cross section
in the next generation of experiments.Comment: 19 pages, 5 figures. v2: new XENON100 results included, references
added. v3: matches published versio
Confronting recent results from selected direct and indirect dark matter searches and the Higgs boson with supersymmetric models with non-universal gaugino masses
Dark matter production from Goldstone boson interactions and implications for direct searches and dark radiation
Performance of the Hamamatsu R11410 photomultiplier tube in cryogenic xenon environments
The Hamamatsu R11410 photomultiplier, a tube of 3'' diameter and with a very low intrinsic radioactivity, is an interesting light sensor candidate for future experiments using liquid xenon (LXe) as target for direct dark matter searches. We have performed several experiments with the R11410 with the goal of testing its performance in environments similar to a dark matter detector setup. In particular, we examined its long-term behavior and stability in LXe and its response in various electric field configurations
Performance of the Hamamatsu R11410 photomultiplier tube in cryogenic xenon environments
The Hamamatsu R11410 photomultiplier, a tube of 3'' diameter and with a very low intrinsic radioactivity, is an interesting light sensor candidate for future experiments using liquid xenon (LXe) as target for direct dark matter searches. We have performed several experiments with the R11410 with the goal of testing its performance in environments similar to a dark matter detector setup. In particular, we examined its long-term behavior and stability in LXe and its response in various electric field configurations