  The hard X-ray continuum and gamma-ray lines from a Type Ia supernova
dominate its integrated photon emissions and can provide unique diagnostics of
the mass of the ejecta, the $^{56}$Ni yield and spatial distribution, its
kinetic energy and expansion speed, and the mechanism of explosion. Such
signatures and their time behavior "X-ray" the bulk debris field in direct
fashion, and do not depend upon the oftimes problematic and elaborate UV,
optical, and near-infrared spectroscopy and radiative transfer that have
informed the study of these events for decades. However, to date no hard
photons have ever been detected from a Type Ia supernova in explosion. With the
advent of the supernova SN 2014J in M82, at a distance of $\sim$3.5 Mpc, this
situation may soon change. Both NuSTAR and INTEGRAL have the potential to
detect SN 2014J, and, if spectra and light curves can be measured, would
usefully constrain the various explosion models published during the last
$\sim$thirty years. In support of these observational campaigns, we provide
predictions for the hard X-ray continuum and gamma-line emissions for fifteen
Type Ia explosion models gleaned from the literature. The model set, containing
as it does deflagration, delayed detonation, merger detonation, pulsational
delayed detonation, and sub-Chandrasekhar helium detonation models,
collectively spans a wide range of properties and, hence, signatures. We
provide a brief discussion of various diagnostics (with examples), but
importantly make the spectral and line results available electronically to aid
in the interpretation of the anticipated data.
