Stochastic background detection with gravitational-wave resonant detectors

A linearized version of the standard Wiener filter theory is used to calculate the sensitivity to an isotropic stochastic gravitational-wave background of the AURIGA-NAUTILUS pair of ultra-low-temperature bar detectors, near to operating in coincidence in Italy, obtaining a sensitivity of approximate to 10(-49) Hz(-1). The addition of the VIRGO interferometric detector under construction in Italy improves the figure to approximate to 8 x 10(-50) Hz(-1) We also consider the pair formed by VIRGO and one large mass spherical detector located in a nearby available site in Italy and a pair of spherical detectors located at the AURIGA and NAUTILUS sites that promise to achieve sensitivities of approximate to 2 x 10(-51) Hz(-1).