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 Modern Physics Letters A 18 (2003) 1485-1492
 Effective photon mass in nuclear matter and finite nuclei
 (2003)
 Electromagnetic field in nuclear matter and nuclei are studied. In the nuclear matter, because the expectation value of the electric charge density operator is not zero, different in vacuum, the U(1) local gauge symmetry of electric charge is spontaneously broken, and consequently, the photon gains an effective mass through the Higgs mechanism. An alternative way to study the effective mass of photon is to calculate the self-energy of photon perturbatively. It shows that the effective mass of photon is about 5.42 MeV in the symmetric nuclear matter at the saturation density ρ0 = 0.16 fm-3 and about 2.0 MeV at the surface of 238U. It seems that the two-body decay of a massive photon causes the sharp lines of electron–positron pairs in the low energy heavy ion collision experiments of 238U + 232Th.
 Thème(s) : Physique/Physique Nucléaire Théorique
 Mot(s)-clé(s) : heavy-ion collisions – photon interaction with hadrons – spontaneous breaking of gauge symmetries – nuclear matter
 in2p3-00167769, version 1 http://hal.in2p3.fr/in2p3-00167769 oai:hal.in2p3.fr:in2p3-00167769 Contributeur : Emmanuelle Vernay <> Soumis le : Mercredi 22 Août 2007, 16:41:48 Dernière modification le : Jeudi 23 Août 2007, 09:28:52