ISSN:
1434-601X
Keywords:
PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass analysis. From threshold up to 370 MeV the total cross-section does not exceed 30 nb. For higher energies it shows a smooth rise until it reaches a maximum of about 10 μb at E γ = 740 MeV. Dalitz plots of m 2(π0π0) versus m 2(p,π0) for seven bins of incident photon energy have been analysed. For E γ 〉 610 MeV, a strong contribution of a sequential decay is observed with the Δ(1232)-resonance as intermediate state. A comparison to model calculations shows that these sequential decays presumably originate from the D 13(1520) and also the P 11(1440)-resonance.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100500070048
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