Computer Science – Sound
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.264...42w&link_type=abstract
Nature, vol. 264, Nov. 4, 1976, p. 42-44. NSF-NASA-supported research.
Computer Science
Sound
5
Balloon Sounding, Energy Spectra, Galactic Radiation, Gamma Rays, Interstellar Radiation, Radioactivity, Astronomical Models, Astronomical Spectroscopy, Line Spectra, Nuclear Fusion, Radioactive Decay, Supernovae
Scientific paper
The paper reports the detection of a large concentration of interstellar radioactivity during balloon-altitude measurements of gamma-ray energy spectra in the band between 0.02 and 12.27 MeV from galactic and extragalactic sources. Enhanced counting rates were observed in three directions towards the plane of the Galaxy; a power-law energy spectrum is computed for one of these directions (designated B 10). A large statistical deviation from the power law in a 1.0-FWHM interval centered near 1.16 MeV is discussed, and the existence of a nuclear gamma-ray line at 1.15 MeV in B 10 is postulated. It is suggested that Ca-44, which emits gamma radiation at 1.156 MeV following the decay of radioactive Sc-44, is a likely candidate for this line, noting that Sc-44 arises from Ti-44 according to explosive models of supernova nucleosynthesis. The 1.16-MeV line flux inferred from the present data is shown to equal the predicted flux for a supernova at a distance of approximately 3 kpc and an age not exceeding about 100 years.
Haymes Robert C.
Walraven G. D.
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