0320056

We propose to observe Cas A and Tycho with INTEGRAL for 2.5 Ms as a continuation of our existing observation program. Cas A is a known source of Ti-44 line emission but with INTEGRAL we can improve the flux measurements and moreover measure or place limits on the velocity line broadening. This is of great importance for the current debate about the nature of core collapse supernovae as Ti-44 probes the inner regions of the explosion. With an additional 2.5 Ms exposure we will be able to detect the continuum emission above ~90 keV. This is important for constraining the continuum underneath the 68 keV and 78 keV lines and it will cast a new light on the nature of the hard X-ray continuum which is presently not known.For Tycho the likely remnant of a Type Ia supernova the goal is to detect Ti-44 line emission or provide stringent upper limits to it. This can establish or rule out that SN 1572 was a sub-Chandrasekhar mass Type Ia event. Moreover with INTEGRAL we will be able to detect Tychos hard X-ray continuum above 30 keV and at least up to 60 keV for the first time. Such measurements are essential for investigating the nature of these hard X-ray tails and for constraining the models of particle acceleration in supernova remnants. [truncated! Please see actual data for full text]