Abstract
Photoproduction of [n] mesons off 12C, 40Ca, 93Nb, and natPb nuclei has been measured with the tagged-photon-beam technique for incident photon energies between 0.6 and 2.2 GeV. The experiment was performed at the Bonn ELSA ac- celerator with the combined setup of the Crystal Barrel and TAPS calorimeters. It aimed at the in-medium properties of the S11(1535) nucleon resonance and the study of the absorption properties of nuclear matter for [n] mesons. Careful consideration was given to contributions from [np] final states and secondary pro- duction mechanisms of [n]-mesons e.g. from inelastic [p]N reactions of intermediate pions. The analysis of the mass number scaling shows that the nuclear absortpion cross section [o]N[n] for [n] mesons is constant over a wide range of the [n] momen- tum. The comparison of the excitation functions to data off the deuteron and to calculations in the framework of a BUU-model show no unexplained in-medium modifications of the S11(1535).
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