E. Pare

Inclusive production of π0'S in the fragmentation region at the SppS collider

Abstract The inclusive production of π0s has been measured in the nucleon fragmentation region at the S p pS Collider at 630 GeV center of mass energy. Average transverse momentum and rapidity distributions compared with lower energy ISR data show no sizable violation of Feynman scaling in the fragmentation region.

A NEW ANALYSIS METHOD FOR VERY HIGH DEFINITION IMAGING ATMOSPHERIC CHERENKOV TELESCOPES AS APPLIED TO THE CAT TELESCOPE

Abstract A new method of shower-image analysis is presented which appears very powerful as applied to those Cherenkov Imaging Telescopes with very high definition imaging capability. It provides hadron rejection on the basis of a single cut on the image shape, and simultaneously determines the energy of the electromagnetic shower and the position of the shower axis with respect to the detector. The source location is also reconstructed for each individual γ-ray shower, even with one single telescope, so for a point source the hadron rejection can be further improved. As an example, this new method is applied to data from the CAT (Cherenkov Array at Themis) imaging telescope, which has been operational since Autumn, 1996.

Searching for TeV dark matter by atmospheric Čerenkov techniques

Abstract There is a growing interest in the possibility that dark matter could be formed of weakly interacting particles with a mass in the 100 GeV-2 TeV range, and supersymmetric particles are favorite candidates. If they constitute the dark halo of our Galaxy, their mutual annihilations produce energetic gamma rays that could be detected using existing atmospheric Cerenkov techniques.

CELESTE: an atmospheric Cherenkov telescope for high energy gamma astrophysics

Abstract CELESTE is an atmospheric Cherenkov telescope based on the sampling method which makes use of the de-commissioned THEMIS solar electrical plant in the French Pyrenees. A large (2000 m 2 ) mirror surface area from 40 independent heliostats followed by a secondary optic, a trigger system using analog summing techniques and signal digitization with 1 GHz flash ADCs make possible the detection of cosmic γ-rays down to 30 GeV . This paper provides a detailed technical description of the CELESTE installation.

Energy and position resolution of silicon calorimeter used in the UA7 experiment

Abstract The performance of a compact 4 in. diameter, 20 radiation lengths silicon/tungsten calorimeter has been evaluated using electron and pion beams up to 100 GeV at the CERN SPS. The energy and position resolutions have been found to be respectively ( 25% √E + 1.1%) GeV and 3.8 mm /√E .