ISSN:
1476-4687
Quelle:
Nature Archives 1869 - 2009
Thema:
Biologie
,
Chemie und Pharmazie
,
Medizin
,
Allgemeine Naturwissenschaft
,
Physik
Notizen:
[Auszug] The relevance of photon-photon absorption to specific astronomical sources has been discussed by several authors7"9. Following their formalism, a photon of energy Ex may collide with a photon of energy Ey and produce an electron-positron pair provided that Ex Ey 〉(1) where me2 =^0.511 MeV is ...
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1038/294332a0