1,324 research outputs found
The BMV project: Search for photon oscillations into massive particles
In this contribution to PSAS08 we report on the research activities developed
in our Toulouse group, in the framework of the BMV project, concerning the
search for photon oscillations into massive particles, such as axion-like
particles in the presence of a strong transverse magnetic field. We recall our
main result obtained in collaboration with LULI at \'Ecole Polytechnique
(Palaiseau, France). We also present the very preliminary results obtained with
the BMV experiment which is set up at LNCMP (Toulouse, France).Comment: Proceedings of PSAS'08, to be published in Can. J. Phy
Application of the spac method to ambient noise recorded in the vesuvius area (italy)
Noise measurements were recorded using a dense short-period seismic
array in Terzigno (Naples), a town that is located about 6 km from the Vesuvius crater. The
aim of this study was to calculate a surface velocity model of the area under investigation
through the application of the Spatial Autocorrelation (SPAC) method, with the hypotheses
that ambient noise is stationary both in time and space, and that it is composed of surface
dispersive waves. The correct knowledge of the surface structure is an important goal in
site-effects studies. Correlation coefficients were calculated as functions of the azimuth on
noise recorded at pairs of equally spaced stations in the frequency range of 1-8 Hz. Then,
the spatial average correlation coefficients were compared to estimates over long-term
recordings. The results appear to validate the hypothesis that ambient noise can be
considered as a stochastic process. The correlation-frequency curves have been fitted to
Bessel functions, from which the Rayleigh wave dispersion curve has been calculated. A
velocity model has been derived from the dispersion curve using both trial and error and a
standard inversion procedure. The results are consistent with those obtained from array
measurements in the area in other studies (Scarpa et al., 2003)
High frequency magnetic oscillations of the organic metal -(ET)ZnBr(CHCl) in pulsed magnetic field of up to 81 T
De Haas-van Alphen oscillations of the organic metal
-(ET)ZnBr(CHCl) are studied in pulsed magnetic
fields up to 81 T. The long decay time of the pulse allows determining reliable
field-dependent amplitudes of Fourier components with frequencies up to several
kiloteslas. The Fourier spectrum is in agreement with the model of a linear
chain of coupled orbits. In this model, all the observed frequencies are linear
combinations of the frequency linked to the basic orbit and to the
magnetic-breakdown orbit .Comment: 6 pages, 4 figure
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