Resonant detectors for gravitational waves and their bandwidth
The sensitivity of the resonant detectors for gravitational waves (GW) is discussed. It is shown that with a very low-noise electronic amplifier it is possible to obtain a frequency bandwidth up to 50 Hz. Five resonant detectors are presently in operation, with a spectral amplitude sensitivity of the order of h˜ = 3 × 10−22(1/√Hz). Initial results are presented, including the first search for coincidences and a measurement of the GW stochastic background.