# Search for new gas mixtures for the MRPC muon telescopes of the EEE Project.

Panetta M.P. per la Collaborazione EEE

Comunicazione
I - Fisica nucleare e subnucleare
Aula 32C-3 - Giovedì 20 h 16:30 - 19:00
The EEE Project is an extended detector network devoted to the study of cosmic rays physics. It is a composed of Multi-gap Resistive Plate Chamber (MRPC) muon telescopes. These MRPCs are operated in avalanche mode by using a gas mixture containing C2H2F4 (R134a) for 98%, and SF6 for 2%. In order to reduce emission of greenhouse gases, several gas mixtures based on environmental friendly gases, i.e. R1234ze and CO2, have been tested using cosmic rays in the new MRPCs of the EEE upgrade (6 gaps, 250 $\mu$m width each). Measurements of detection efficiency, cluster size and noise rate will be presented.