Measurement of the helicity-dependent total cross-section for the $ \gamma$ n $ \rightarrow$ p $ \pi^{-}_{}$ $ \pi^{0}_{}$ reaction

J Ahrens,J C Mcgeorge,Ch Rohlof,G Reicherz,G Rosner,J R M Annand,C Bradtke,G Tamas,D Protopopescu,T Rostomyan,H R Weller,O Jahn,V Lisin,T Pinelli,R Kondratiev,A Panzeri,P Pedroni,M Martinez-Fabregate,H Dutz,H J Arends ,M A Blackston ,Frank Klein ,R Beck ,E Heid ,Μ Lang ,D Ryckbosch ,W Meyer ,A Thomas ,A Fix ,N D’hose ,S Altieri ,A Braghieri

doi:10.1140/epja/i2011-11036-1

Measurement of the helicity-dependent total cross-section for the $ \gamma$ n $ \rightarrow$ p $ \pi^{-}_{}$ $ \pi^{0}_{}$ reaction

J Ahrens, J C Mcgeorge + Show 30 more

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https://doi.org/10.1140/epja/i2011-11036-1

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Journal: The European physical journal. A, Hadrons and nuclei	Publication Date: Mar 1, 2011
Citations: 6

Affiliation: Johannes Gutenberg University Mainz, University of Glasgow, University of Bonn, Ruhr University Bochum, Ghent University, Duke University, University of Pavia, INFN Sezione di Pavia, National Research Tomsk State University, Tomsk Polytechnic University, CEA Saclay, Atomic Energy and Alternative Energies Commission

#Incident Photon Energies #Dependence Of Cross-section + Show 8 more

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Abstract

The helicity dependence of the total cross-section for the gamma n -> p pi(-)pi(0) reaction has been measured for the first time at incident photon energies from 450 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Both the measured unpolarized and the helicity-dependent observables are not well described by the existing theoretical models.

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