Abstract
We have searched for the three decay lines of the 44Ti in Cassiopeia A with the spectrometer SPI on-board INTEGRAL. The lines at 78.4 and 1157.0keV have been detected with a flux of (2.1±0.7)×10−5phcm−2s−1, consistent with all previous measurements combined. The spectral capabilities of SPI indicate that the 44Ti ejecta expands at about 430kms−1 and moves away from the observer at about 500kms−1. Such a small expansion velocity together with the 44Ti yield of the event are consistent with a spherical explosion but an asymmetric explosion due for instance to prolate neutrino emission could not be definitely excluded.
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