9,515 research outputs found
Direct Dark Matter Searches and the EDELWEISS-II Experiment
Direct searches for Dark Matter are experiment dedicated to the observation
of the energetic recoiling ions produced by the scattering of WIMP particles
from our galactic halo on terrestrial targets. The status and prospects of some
currently running experiments are presented, together with new preliminary
results of the experiments EDELWEISS-II.Comment: Talk presented at XLIVth Rencontres de Moriond, Electroweak
Interactions and Unified Theories Session, La Thuile, Italy, March 2009, to
appear in the proceeding
Surface effects on the statistics of the local density of states in metallic nanoparticles: manifestation on the NMR spectra
In metallic nanoparticles, shifts in the ionization energy of surface atoms
with respect to bulk atoms can lead to surface bands. Within a simple Tight
Binding model we find that the projection of the electronic density of states
on these sites presents two overlapping structures. One of them is
characterized by the level spacing coming from bulk states and the other arises
from the surface states. In very small particles, this contributes to an
over-broadening of the NMR absorption spectra, determined by the Knight shift
distribution of magnetic nuclei. We compare our calculated Knight shifts with
experiments on aluminum nanoparticles, and show that the deviation of the
scaling law as a function of temperature and particle size can be explained in
terms of surface states.Comment: 1 tar.gz fil
Direct search for WIMP dark matter
We will review the experimental aspects of the direct search for WIMP dark
matter. In thin search, one looks in a terrestrial target for nuclear recoils
produced by the impacts with WIMPs from the galatic halo. After describing the
different search strategies and review the currently running experiments and
the prospects of future experiment
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