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Evidence for narrow Δ0(1232) states in the 12 C(e,e'pπ}11 C Reaction

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The reaction 12C(e,e'Δ0)11C →12C(e,e'pπ)11C was investigated at the Mainz Microtron MAMI in a triple coincidence measurement using the three spectrometer setup of the A1 Collaboration. The good missing mass resolution of σm= 0.27 MeV/c2 allowed to select the events belonging to the ground state of 11C. Cutting on these events the excitation energy spectra of 12CΔ0 show evidence for two peaks of about 4 MeV width (FWHM) at 282 MeV and 296 MeV with a significance of about 4.5 standard deviations. The peaks are interpreted in a simple weak coupling model as bound Δ0 states in 12CΔ0.

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Received: 23 December 1998

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Bartsch, P., Baumann, D., Bermuth, J. et al. Evidence for narrow Δ0(1232) states in the 12 C(e,e'pπ}11 C Reaction . EPJ A 4, 209–216 (1999). https://doi.org/10.1007/s100500050220

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  • DOI: https://doi.org/10.1007/s100500050220

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