  The nuSTORM facility has been designed to deliver beams of electron neutrinos
and muon neutrinos (and their anti-particles) from the decay of a stored muon
beam with a central momentum of 3.8 GeV/c and a momentum acceptance of 10%. The
facility is unique in that it will: 1. Allow searches for sterile neutrinos of
exquisite sensitivity to be carried out; 2. Serve future long- and
short-baseline neutrino-oscillation programs by providing definitive
measurements of electron neutrino and muon neutrino scattering cross sections
off nuclei with percent-level precision; and 3. Constitutes the crucial first
step in the development of muon accelerators as a powerful new technique for
particle physics. The document describes the facility in detail and
demonstrates its physics capabilities. This document was submitted to the
Fermilab Physics Advisory Committee in consideration for Stage I approval.
