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Reactionπd→pπnin theΔresonance region

Physical Review C1981Vol. 23(1), pp. 407–414

J. Hoftiezer, S. Baker, J.M. Clement, W. H. Dragoset, Ian Duck, R. D. Felder, D. Judd, G. S. Mutchler, G. P. Pepin, G. C. Phillips, E. A. Umland, J. C. Allred, E.V. Hungerford, B. Mayes, L. Pinsky, T. M. Williams, M. Furić, W. von Witsch

Abstract

Differential cross sections for the reaction $^{2}\mathrm{H}({\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}},p{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}})n$ at incident pion momentum 340 MeV/c in a kinematically complete experiment are reported for eleven angle pairs. At neutron momenta \ensuremath{\lesssim} 40 MeV/c the cross section peaks sharply and is described well by an impulse approximation corrected for entrance channel effects; the ratio of ${\ensuremath{\pi}}^{+}$ to ${\ensuremath{\pi}}^{\ensuremath{-}}$ cross section is approximately 9 to 1. For neutron momenta \ensuremath{\gtrsim} 40 MeV/c, the data are well fit by a combination of a ${J}^{\ensuremath{\pi}}={2}^{+} N\ensuremath{\Delta}$ dibaryon resonance amplitude and an impulse approximation background; in some cases the ratio of ${\ensuremath{\pi}}^{+}$ to ${\ensuremath{\pi}}^{\ensuremath{-}}$ cross section is 1 to 1.NUCLEAR REACTIONS $^{2}\mathrm{H}({\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}},p{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}})n$, $p=340$ MeV/c; measured $\frac{{d}^{3}\ensuremath{\sigma}}{d{p}_{p}d{\ensuremath{\Omega}}_{p}d{\ensuremath{\Omega}}_{\ensuremath{\pi}}}$; model with DWIA, ${p}_{n}\ensuremath{\lesssim}40$ MeV/c; model with ${J}^{\ensuremath{\pi}}={2}^{+} T=1 N\ensuremath{\Delta}$ dibaryon resonance, ${p}_{n}\ensuremath{\gtrsim}40$ MeV/c.

Abstract

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