Author/Authors :
Astone، نويسنده , , P. and Babusci، نويسنده , , D. and Bassan، نويسنده , , M. and Bonifazi، نويسنده , , P. and Cavallari، نويسنده , , G. and Coccia، نويسنده , , E. J. Antonio، نويسنده , , S. and Fafone، نويسنده , , V. and Giordano، نويسنده , , G. and Ligi، نويسنده , , C. and Marini، نويسنده , , A. and Mazzitelli، نويسنده , , G. and Minenkov، نويسنده , , Y. and Modena، نويسنده , , I. and Modestino، نويسنده , , G. and Moleti، نويسنده , , A. and Pallottino، نويسنده , , G.V. and Pizzella، نويسنده , , G. and Quintieri، نويسنده , , L. and Rocchi، نويسنده , , A. and Ronga، نويسنده , , F. and Terenzi، نويسنده , , R. and Visco، نويسنده , , M.، نويسنده ,
Abstract :
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 expected values 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 ∼670 K, corresponding to ∼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.
