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Description
Intense and highly collimated neutrino beams are intrinsic by-products of muon decays in a high-energy muon collider. The large boost of the primary muons confines the emitted neutrinos within angular spreads of order ($10^{-5}$ rad), resulting in fluxes far exceeding those achievable in conventional neutrino facilities. Their unique properties also open opportunities for high-energy neutrino physics. In this work, the neutrino beams produced near the interaction point are characterised in terms of their spatial and energy distributions, with emphasis on their potential use for dedicated neutrino detectors. The neutrino fluence is evaluated as a function of distance from the interaction point for representative detector acceptances. At short distances, larger acceptances intercept nearly the entire neutrino core, leading to fluence saturation, while at kilometre scales different acceptances yield comparable values as beam divergence becomes significant. These results demonstrate the strong collimation and intensity of muon-collider neutrino beams and support their potential use in high-precision, high-energy neutrino studies.
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