Other
Scientific paper
Nov 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.246..136l&link_type=abstract
Nature, Volume 246, Issue 5429, pp. 136-138 (1973).
Other
2
Scientific paper
MANY measurements of the diffuse X-ray and γ-ray background1-4 indicate that it consists of an inverse power law spectrum with index ~2.0. Spectral features or excesses are reported in the vicinity of ~40 keV and ~1 MeV. When plotted on linear-linear paper the 1 MeV excess is seen to consist of a pronounced peak in the 0.5 to 2.0 MeV region with a feeble tail extending on to higher energy (Fig. 1). In this paper a simple explanation is presented for the 1 MeV peak in light of new experimental and theoretical advances made in the past year. No explanation is presented for the higher energy excess and it is presumed to come from other mechanisms. I hypothesise that the peak arises from the astrophysical production of deuterium by the two body recombination process (p+n-->D+2.2 MeV γ ray) in an environment transparent to the emitted γ rays. The hypothesis is shown to lead unambiguously to two remarkable numerical results: a calculation of the terrestrial n(D)/n(H) ratio; and a prediction of QSO cutoffs at z~3.
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