ICARUS: Measurements and Analysis of Real Events waiting for Operation in Underground Laboratory

The ICARUS 600 ton liquid argon TPC, the first module of the final 3000 ton detector, has been completely mounted and tested in Pavia and it is ready since 2002 for transportation to the Gran Sasso laboratory. It has a self-contained experimental program, though with a strong connotation of technological development, in view of the operability inside the underground site like a large mass liquid argon "electronic bubble chamber". The physics items are ranging from the search of the matter stability to the measurement of neutrino oscillation parameters. After the completion of the first half module (300 ton) construction, a full test has been carried out with cosmic rays at see level. The data taking, extended over about 100 days of continuous operation, has been fully successful in checking both cryogenics and electronic equipment. The data analysis confirms that the ICARUS liquid argon TPC technology is now fully operational at real experimental level, also at the big mass scale necessary to look for the next generation neutrino experiments and for the proton-decay search. Some preliminary results are presented in this report