Surface and volume effects in the photoabsorption of nuclei

Details Surface and volume effects in the photoabsorption of nuclei Surface and volume effects in the photoabsorption of nuclei

2004-11-06

arxiv.org/abs/nucl-ex/0411009v1

Eur.Phys.J. A22 (2004) 347-351

Physics

Nuclear Physics

Nuclear Experiment

accepted for publication in Eur. J. Phys. A

Scientific paper

10.1140/epja/i2004-10098-4

Recent experimental results for meson photoproduction from nuclei obtained with TAPS at MAMI are analyzed in view of the suppression of the second nucleon resonance region in total photoabsorption. The cross sections can be split into a component from the low density surface region of nuclei and a component which scales more like the nuclear volume. The energy dependence of the surface component is similar to the deuteron cross section, it shows a clear signal for the second resonance peak assigned to the excitation of the P11(1440), D13(1520), and S11(1535). The volume component behaves differently, it is lacking the second resonance peak and shows an enhancement at intermediate photon energies.

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