Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-06-09
Astropart.Phys.30:200-208,2008
Physics
High Energy Physics
High Energy Physics - Experiment
submitted to Astroparticle Physics
Scientific paper
10.1016/j.astropartphys.2008.09.
The cryogenic resonant gravitational wave detectors NAUTILUS and EXPLORER, made of an aluminum alloy bar, can detect cosmic ray showers. At temperatures above 1 K, when the material is in the normal conducting state, the measured signals are in good agreement with the values expected based on the cosmic rays data and on the thermo-acoustic model. When NAUTILUS was operated at the temperature of 0.14 K, in superconductive state, large signals produced by cosmic ray interactions, more energetic than expected, were recorded. The NAUTILUS data in this case are in agreement with the measurements done by a dedicated experiment on a particle beam. The biggest recorded event was in EXPLORER and excited the first longitudinal mode to a vibrational energy of about 670 K, corresponding to about 360 TeV absorbed in the bar. Cosmic rays can be an important background in future acoustic detectors of improved sensitivity. At present, they represent a useful tool to verify the gravitational wave antenna performance.
Astone Pia
Babusci Danilo
Bassan Massimo
Bonifazi P.
Cavallari G.
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