807 research outputs found
First Characterization of the Ultra-Shielded Chamber in the Low-noise Underground Laboratory (LSBB) of Rustrel Pays d'Apt
In compliance with international agreements on nuclear weapons limitation,
the French ground-based nuclear arsenal has been decommissioned in its
totality. One of its former underground missile control centers, located in
Rustrel, 60 km east of Avignon (Provence) has been converted into the
``Laboratoire Souterrain \`a Bas Bruit de Rustrel-Pays d'Apt'' (LSBB). The
deepest experimental hall (500 m of calcite rock overburden) includes a 100
m area of sturdy flooring suspended by and resting on shock absorbers,
entirely enclosed in a 28 m-long, 8 m-diameter, 1 cm-thick steel Faraday cage.
This results in an unparalleled combination of shielding against cosmic rays,
acoustic, seismic and electromagnetic noise, which can be exploited for rare
event searches using ultra low-temperature and superconducting detectors. The
first characterization measurements in this unique civilian site are reported.
For more info see http://home.cern.ch/collar/RUSTREL/rustrel.htmlComment: Homepage and quoted hyperlinks have been updated: see
http://home.cern.ch/collar/RUSTREL/rustrel.htm
Prospects For Identifying Dark Matter With CoGeNT
It has previously been shown that the excess of events reported by the CoGeNT
collaboration could be generated by elastically scattering dark matter
particles with a mass of approximately 5-15 GeV. This mass range is very
similar to that required to generate the annual modulation observed by
DAMA/LIBRA and the gamma rays from the region surrounding the Galactic Center
identified within the data of the Fermi Gamma Ray Space Telescope. To
confidently conclude that CoGeNT's excess is the result of dark matter,
however, further data will likely be needed. In this paper, we make projections
for the first full year of CoGeNT data, and for its planned upgrade. Not only
will this body of data more accurately constrain the spectrum of nuclear recoil
events, and corresponding dark matter parameter space, but will also make it
possible to identify seasonal variations in the rate. In particular, if the
CoGeNT excess is the product of dark matter, then one year of CoGeNT data will
likely reveal an annual modulation with a significance of 2-3. The
planned CoGeNT upgrade will not only detect such an annual modulation with high
significance, but will be capable of measuring the energy spectrum of the
modulation amplitude. These measurements will be essential to irrefutably
confirming a dark matter origin of these events.Comment: 6 pages, 6 figure
Max E. G. Bartels and the Javan lapwing Vanellus macropterus
No description supplie
The kinetic dark-mixing in the light of CoGENT and XENON100
Several string or GUT constructions motivate the existence of a dark U(1)_D
gauge boson which interacts with the Standard Model only through its kinetic
mixing. We compute the dark matter abundance in such scenario and the
constraints in the light of the recent data from CoGENT, CDMSII and XENON100.
We show in particular that a region with relatively light WIMPS, M_{Z_D}< 40
GeV and a kinetic mixing 10^-4 < delta < 10^-3 is not yet excluded by the last
experimental data and seems to give promising signals in a near future. We also
compute the value of the kinetic mixing needed to explain the
DAMA/CoGENT/CRESST excesses and find that for M_{Z_D}< 30 GeV, delta ~ 10^-3 is
sufficient to fit with the data.Comment: 6 pages, 5figure
Search for a Non-Relativistic Boson in Two-Body Antimuon Decay
We demonstrate the feasibility of probing the charged lepton flavor violating
decay for the presence of a slow-moving
neutral boson capable of undergoing gravitational binding to large
structures, and as such able to participate in some cosmological scenarios. A
short exposure to surface antimuons from beamline M20 at TRIUMF generates a
branching ratio limit of . This is comparable or better than
previous searches for this channel, although in a thus-far unexplored region of
phase space very close to the kinematic limit of the decay. The future
improved sensitivity of the method using a customized p-type point contact
germanium detector is described.Comment: 5 pages, 5 figures. V.2 includes a comparison with future sensitivity
of Mu3e in final figur
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