090278

We propose a deep EPIC observation of the highly asymmetric young ( and amp amp amp lt 600 years old) core-collapse (CC) supernova remnant G350.1--0.3 whose spectrum is dominated by iron-rich ejecta expanding at up to 6000 km/s away from an almost-stationary thermally emitting neutron star (CCO) and for which a very high nickel abundance has been claimed. We shall quantify emission from Ni and Cr in addition to Fe to derive constraints on nucleosynthesis in explosive Si-burning regions. We shall also pursue hints of nonthermal emission search for faint ejecta elsewhere near the CCO search for the blast wave and obtain a very deep spectrum of the CCO. G350.1--0.3 may join Cassiopeia A as a major source for understanding of CC processes and we expect this long observation to have archival value. [truncated! Please see actual data for full text]