The creation of a much more massive pair, like a proton and antiproton, requires photons with energy of more than ( hard gamma ray photons ).
2.
When it came time for Gentner to submit his " Habilitationsschrift ", " Die Absorption, Streuung und Sekund�rstrahlung harter Gamma-Strahlen " ( " The absorption, scattering and secondary hard gamma rays " ), the relations between the KWImF and the University of Heidelberg were so strained that " Habilitation " was not possible there.
3.
This link suggests that for a moderately-sized nuclear weapon detonated in the lower atmosphere, some 35 % of the total energy yield of the nuke will show up as heat, light, and soft x-rays; another 5 % of the energy will be in the form of hard gamma rays and energetic neutrons . talk ) 02 : 34, 18 January 2007 ( UTC)
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