  The physics chapter of the NUSEL-Homestake Reference Design Science Book
describes the physics motivation for building a deep underground science and
engineering laboratory. It includes discussions of outstanding problems in
neutrino physics and astrophysics (including long-baseline probes of theta-13
and CP violation, solar and atmospheric neutrinos, and double beta decay), dark
matter, nucleon decay, nuclear astrophysics with underground detectors, and
neutrinos as a probe of supernovae.
