Abstract
We present an analysis of the BeppoSAX high X-ray energy spectrum of the supernova remnant Cassiopeia A with an observation time of 83 10 3 s. We measure a flux upper limit of 4.1 10 −5 ph cm −2 s −1 (99.7% confidence) of the nuclear decay lines of 44Ti at 68 keV and 78 keV that is lower and inconsistent with the flux of an accompanying line at 1157 keV measured by CGRO's Comptel. However, if the underlying X-ray continuum is lower, because the spectrum is steepening, the actual 44Ti may be higher and consistent with the Comptel result, although the measured flux of (2.9±1.0) 10 −5 ph cm −2 s −1 under this assumption is still lower than the flux measured by Comptel.
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