3 research outputs found
The status of the ARGO experiment at YBJ
The ARGO-YBJ experiment, located at Yangbajing, Tibet, China, performed by a wide Sino-Italian
collaboration, is designed to study cosmic rays, sub-TeV gamma ray sources and GeV Gamma Ray
Burst (GRB) emission in the northern hemisphere, by means of detecting small size EAS (Extensive Air
Shower) using a full coverage RPC (Resistive Plate Chamber) carpet. The central carpet of the detector
is installed and put into operation to date, with 1900m2 of the carpet already operating since December
2004. With a trigger multiplicity of ≥60 hits, corresponding to a primary mode energy of 2 TeV, the
angular resolution of EAS measurements is < 1o for showers with more than 500 recorded hits. We report
the preliminary results of data taking performed during 2005: the all-sky survey for gamma ray sources
and the search for GRBs, as well as the cosmic ray spectrum up to about 100TeV. The Forbush decrease
of the cosmic ray flux during January, 2005 is observed using the ARGO data