Measurement of the Differential Cross Section for the Reaction γnπp from Deuterium

W. Chen et al. (The CLAS Collaboration)
Phys. Rev. Lett. 103, 012301 – Published 1 July 2009

Abstract

We report a measurement of the differential cross section for the γnπp process from the CLAS detector at Jefferson Laboratory in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles (θc.m.) between 50° and 115°. We confirm a previous indication of a broad enhancement around a c.m. energy (s) of 2.1 GeV at θc.m.=90° in the scaled differential cross section s7dσdt and a rapid falloff in a center-of-mass energy region of about 400 MeV following the enhancement. Our data show an angular dependence of this enhancement as the suggested scaling region is approached for θc.m. from 70° to 105°.

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  • Received 6 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.012301

©2009 American Physical Society

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Vol. 103, Iss. 1 — 3 July 2009

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