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In-medium properties of the D₁₃(1520) nucleon resonance
Journal
Physical review letters
Volume
86
Number
21
Pages / Article-Number
4764-4767
Abstract
The in-medium properties of the D-13(1520) nucleon resonance were studied via photoproduction of pi (0) mesons from nuclei (C, Ca, Nb, Pb) with the TAPS detector at the Mainz Microton accelerator. The inclusive (single and multiple pion production) data disagree with model predictions which explain the disappearance of the second resonance bump in total photoabsorption via a medium modification of the D-13 -> N rho decay. The exclusive single pi (0) production data show no broadening of the resonance structure beyond Fermi smearing. Both results together cast doubt on attempts to explain the vanishing of the second resonance bump for nuclei by a broadening of the D-13 resonance.