60 research outputs found
Members of the WA9 team celebrate
No full textWA9 was an experiment set up by the Clermont Ferrand-Leningrad-Lyon-Uppsala Collaboration to study with high precision elastic scattering in the Coulomb interference region. Here: A.A. Vorobyov, M. Querrou, A.P. Kashchuk, I.I. Tkach, J.P. Martin, T. Ekelöf, G.A. Korolev, (?), V.A. Schegelsky, A.S. Denisov, S. Kullander, M. Chemarin, P. Grafström, S. Maury, E. Hagber
Etude experimentale et theorique de la diffusion coherente de mesons de 1.12 GeV sur helium 4. Application a la determination de la partie reelle de l'amplitude de diffusion nucleon
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Theoretical approach of the photofield emission of a degenerated semiconductor. - Case of tipped, weakly P-doped, silicon photocathodes.
No full textPhotofield emission from a tipped silicon photocathode in IR with a new picosecond Nd-YAG laser at a frequency of 100 MHz
No full textInternational audienceTipped silicon photocathodes are tested with the IR wavelength (1.064micronmeter) Full-size image (<1 K) of a new lock-mode Nd–YAG laser. The impulse width of 30 ps is repeated at a frequency of 100 MHz at a power of 122 W. A quantum yield of 2.5×10−3 is obtained in a DC gun using the best continuous emission field of 20 MV/m for the photofield emission current. The ratio of the photofield emission current to the field emission current (dark current) is more than 104. A previous experiment with the second harmonic of a Nd–YAG at 10 Hz gave 700 pC per pulse of 35 ps width with a quantum yield of 10−5 at the threshold emission field of 7.5 MV/m
Proposition d'experience: etude de diffusion coherente p-He à 24 GeV par une methode de recul utilisant des detecteurs a semiconducteurs
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