Physics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.275..200l&link_type=abstract
Nature, Volume 275, Issue 5677, pp. 200 (1978).
Physics
1
Scientific paper
WALRAVEN AND HAYMES1 have reported the possible detection of a ~1.16 MeV γ-ray line at a flux level of (3.4+/-1.5)×10-3 photons cm-2 s-1 from a point in the galactic plane (l = 345°, b = 5°). If correct this could be an enormously important result constituting the first direct confirmation of theories of explosive nucleosynthesis (ref. 2 and refs therein). Clayton et al.3-4 have predicted that the most intense γ-ray line to be emitted from the radioactive debris of a typical supernova after ~3 yr will be the 1.156 MeV line from the decay of 44Ti (τ1/2 = 48 yr). However, the reported detection was at a marginal level of statistical significance (2.6σ). It was mainly the ``remarkable double coincidence that just the theoretically-predicted spectral anomaly occurred'' when the telescope was pointed at a region of the galactic plane believed to contain young supernova remnants, that encouraged these workers to report this result. Clearly an independent attempt to confirm this observation with a telescope of finer energy resolution is called for. Here we report the result of such an attempt. Our conclusion is that the reported positive detection was probably a statistical fluctuation.
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