RAP: acoustic detection of particles in ultracryogenic resonant antenna

The resonant-mass gravitational wave detector NAUTILUS has recently recorded signals due to cosmic rays crossing. Very large signals have been observed in the superconductive state of the antenna. In order to investigate this anomalous response at low temperatures, the Rivelazione Acustica di Particelle experiment has been approved. Its purpose is the measurement of the mechanical vibrations in a superconducting (T similar to 100 mK) cylindrical aluminium bar when hit by 105 electrons at 510MeV from the DAPhiNE Beam Test Facility, corresponding to the energies released by extensive air showers... Mehr ...