10,329 research outputs found
Sound velocity and absorption measurements under high pressure using picosecond ultrasonics in diamond anvil cell. Application to the stability study of AlPdMn
We report an innovative high pressure method combining the diamond anvil cell
device with the technique of picosecond ultrasonics. Such an approach allows to
accurately measure sound velocity and attenuation of solids and liquids under
pressure of tens of GPa, overcoming all the drawbacks of traditional
techniques. The power of this new experimental technique is demonstrated in
studies of lattice dynamics, stability domain and relaxation process in a
metallic sample, a perfect single-grain AlPdMn quasicrystal, and rare gas, neon
and argon. Application to the study of defect-induced lattice stability in
AlPdMn up to 30 GPa is proposed. The present work has potential for application
in areas ranging from fundamental problems in physics of solid and liquid
state, which in turn could be beneficial for various other scientific fields as
Earth and planetary science or material research
A superfluid He3 detector for direct dark matter search
MACHe3 (MAtrix of Cells of superfluid He3) is a project of a new detector for
direct Dark Matter Search. The idea is to use superfluid He3 as a sensitive
medium. The existing device, the superfluid He3 cell, will be briefly
introduced. Then a description of the MACHe3 project will be presented, in
particular the background rejection and the neutralino event rate that may be
achieved with such a device.Comment: 6 pages, 3 figures, Proceedings of the 3rd International Workshop on
the Identification of Dark Matter (York, UK, 09/18/2000-09/22/2000
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