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Ti – Comments on evaluation of decay data

Nuclear Data Ti is of considerable interest in astrophysics, since it is one of the few long-lived gamma-ray-emitting nuclides expected to be substantially produced during a supernova explosion. Moreover, the solar system abundance of Ca is believed to have originated from the nucleosynthesis of Ti and the subsequent decays. The characteristic 1157-keV gamma ray from Sc, which was observed from the young supernova remnant Cassiopeia A , opened the possibility of deducing the mass of Ti that was ejected in the explosion. For this calculation, however, it was needed (among other quantities) a reasonably precise knowledge of the Ti half-life.