ar X iv : a st ro - p h / 03 11 08 0 v 1 4 N ov 2 00 3 44 Ti radioactivity in young supernova remnants : Cas A and SN 1987 A
نویسنده
چکیده
We investigate radioactivity from the decay sequence of Ti in young supernova remnants (SNRs), Cassiopeia A (Cas A) and SN 1987A. It is shown by a linear analysis that ionization of Ti, a pure electron capture decay isotope, affects the radioactivity contradistinctively in these two SNRs: Ionization of Ti to H-like and He-like states enhances its present radioactivity in Cas A, while such high-ionization decreases its radioactivity in SN 1987A. We briefly discuss the enhancement factor of the present radioactivity of Cas A considering microscopic (atomic/nuclear) physics combined with a hydrodynamical SNR evolution model. For SN 1987A, we have obtained the initial Ti mass of (0.82 − 2.3) × 10M⊙ from our Monte-Carlo simulations. The resulting fluxes of γ and hard X-rays emerged from the Ti decay are given for the current and future experiments.
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