### Abstract

We study the nuclear (or [Formula Presented] dependence of the coherent [Formula Presented] photoproduction reaction in a relativistic impulse approximation approach. We use a standard relativistic parametrization of the elementary amplitude, based on a set of four Lorentz- and gauge-invariant amplitudes, to calculate the coherent production cross section from [Formula Presented], [Formula Presented], and [Formula Presented]. In contrast to nonrelativistic treatments, our approach maintains the full relativistic structure of the process. The nuclear structure affects the process through the ground-state tensor density. This density is sensitive to relativistic effects and depends on [Formula Presented] in a different manner than the vector density used in nonrelativistic approaches. This peculiar dependence results in [Formula Presented] having a cross section significantly smaller than that of [Formula Presented]—in contrast to existent nonrelativistic calculations. Distortion effects are incorporated through an [Formula Presented]-nucleus optical potential that is computed in a simple “[Formula Presented]” approximation.

Original language | English |
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Pages (from-to) | 2053-2056 |

Number of pages | 4 |

Journal | Physical Review C - Nuclear Physics |

Volume | 57 |

Issue number | 4 |

DOIs | |

Publication status | Published - 1 Jan 1998 |

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### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Physical Review C - Nuclear Physics*,

*57*(4), 2053-2056. https://doi.org/10.1103/PhysRevC.57.2053