A measurement of the differential cross section for the reaction ${\hat{I}}^{3}n\to \ddot{I}{€}^{-}p$ from deuterium

Abstract

We report a measurement of the differential cross section for the ${\hat{I}}^{3}n\to \ddot{I}{€}^{-}p$ process from the CLAS detector at Jefferson Lab in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles ($\hat{I}{¸}_{c.m.}$) between 50${}^{\circ }$ and 115${}^{\circ }$. We confirm a previous indication of a broad enhancement around a c.m. energy ($\sqrt{s}$) of 2.2 GeV at $\hat{I}{¸}_{c.m.}=90^{\circ }$ in the scaled differential cross section, $s^7\frac{d\ddot{I}ƒ}{dt}$. Our data show the angular dependence of this enhancement as the scaling region is approached in the kinematic region from 70${}^{\circ }$ to 105${}^{\circ }$.

6 pages, 3 figures. submitted to PRL