$γ$-Radiation of Excited Nuclear Discrete Levels in Peripheral

Details $γ$-Radiation of Excited Nuclear Discrete Levels in Peripheral $γ$-Radiation of Excited Nuclear Discrete Levels in Peripheral

2001-03-07

arxiv.org/abs/nucl-th/0103018v2

Eur.Phys.J. A14 (2002) 199-206

Physics

Nuclear Physics

Nuclear Theory

14 pages, 4 figures

Scientific paper

A new process of a nuclear excitation to discrete states in peripheral heavy ion collisions is studied. High energy photons are emitted by the exited nuclei with energies up to a few tens GeV at angles of a few hundred microradians with respect to the beam direction. We show that a two stage process where an electron - positron pair is produced by virtual photons emitted by nuclei and the n the electron or positron excites the nucleus, has large cross section. It is equal to about 5 b f or CaCa collisions. On one hand it produces a significant $\gamma$-rays background in the nuclear f ragmentation region but on the other hand it could be used to monitoring the nuclear beam intensity at LHC. These secondary nuclear photons could be a good signal for triggering peripheral nuclear collisions.

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