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In this contribution we discuss the 44Ti nucleosynthesis gamma-ray lines andtheir visibility with SIMBOL-X from simulations based on its expectedsensitivity and spectro-imaging capabilities. The 44Ti radioactive nucleus canprovide invaluable information on the details of supernova explosions. Itslifetime of about 85 yrs makes it the best indicator of the youth of thesestellar explosions through its three gamma-ray lines at 67.9, 78.4 keV and1.157 MeV. We focus on the youngest Galactic supernova remnants, namely:Cassiopeia A, for which the location and Doppler-velocity estimates of the44Ti-emitting regions in the remnant would offer for the first time a uniqueview of nucleosynthesis processes which occurred in the innermost layers of thesupernova; SN 1987A, in the Large Magellanic Cloud, whose progenitor is known,and for which the expected measurement of these lines would greatly constrainthe stellar evolution models; Tycho and Kepler SNRs for which 44Ti lines havenever been detected so far. The issue of the "young, missing and hidden"supernova remnants in the Galaxy will also be addressed using SIMBOL-Xobservations at the position of the 44Ti excesses that wide-field instrumentslike those onboard INTEGRAL and SWIFT/BAT should be able to reveal.

44Ti nucleosynthesis gamma-ray lines with SIMBOL-X