Revisiting INTEGRAL/SPI observations of⁴⁴Ti from Cassiopeia A

Context. The 340-yr old supernova remnant Cassiopeia A, located at 3.4 kpc distance, is the best-studied young core-collapse supernova remnant. Nucleosynthesis yields in radioactive isotopes have been studied with different methods, in particular for production and ejection of 44Ti and 56Ni, which originate in the innermost regions of the supernova. 44Ti was first discovered in this remnant, but is not seen consistently in other core-collapse sources.