Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ncimb.118.1019p&link_type=abstract
Il Nuovo Cimento B, vol. 118, Issue 10, p.1019
Physics
Scientific paper
The sensitivity of resonant detectors for gravitational waves (GW) is discussed. It is shown that a resonant detector equipped with a quantum limited amplifier can have a bandwidth up to 50 Hz or more. Cryogenic resonant antennas are today in operation and data are being recorded by ALLEGRO, AURIGA, EXPLORER, NAUTILUS and NIOBE. The sensitivity for pulse detection is now h 4 . 10-19 (corresponding to a total energy of less than 0.001 solar masses for a source in the Galactic Center). The sensitivity for monochromatic waves is h 2 . 10-25 for one year of integration and 7 . 10-221/ for a stochastic background detection. Initial results are given and perspectives for resonant detectors are illustrated. Recently an intriguing result, a sidereal time effect, has been found when searching for coincidences between EXPLORER and NAUTILUS with data taken in the years 1998 and 2001. We report also on large signals observed with the NAUTILUS detectors in coincidence with cosmic ray showers. Plans for the construction of large spherical detectors that should reach at 1 kHz a spectral sensitivity of the order of 7 . 10-241/ are reported.
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