Neutrino fluxes from a high-intensity spallation neutron facility

The neutrino production rates for a spallation neutron source with proton beams in the energy range 650 < T-p < 2200 MeV calculated to an estimated accuracy of 25%. The target geometries used are based on the tantalum and mercury targets proposed for the European Spallation Source. Results for nu(mu), nu(e), and <(nu)over bar (mu>) rates due to pi(+) and mu(+) decay at rest, and for nu(mu) rates from pi(+) decay in flight, are presented in terms of neutrinos per proton. Production rates for decay at rest from a tantalum target are calculated to be (v p(-1)) = 0.075 at T-p = 1000 MeV, and 0.327 at 2200 MeV. For a neutrino detector located 20 m from a tantalum target, and at 0 degrees to a 1500 MeV proton beam, the integrated flux of nu(mu) above 150 MeV from pi(+) decay in flight is 3.0 x 10(5) cm(-2) s(-1). Backgrounds of <(nu)over bar (e)>, from the pi(-) decay-in-flight and mu(-) decay-at-rest chain, vary from 0.05% to 0.09% of the nu(e) flux.