Nuclear pion photoproduction in the Δ resonance region

D. Branford, J.A. MacKenzie, F.X. Lee, J. Ahrens, J.R.M. Annand, R. Beck, G.E. Cross, T. Davinson, P. Grabmayr, S.J. Hall, P.D. Harty, T. Hehl, D.G. Johnstone, J.D. Kellie, T. Lamparter, M. Liang, I.J.D. MacGregor, J.C. McGeorge, R.O. Owens, M. SauerR. Schneider, A.C. Shorter, K. Spaeth, D.P. Watts, P.J. Woods, L.E. Wright, T.T. Yau

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A measurement of the C(γ, π n)B reaction in quasifree π-production kinematic regimes has been performed using tagged photons in conjunction with large solid angle π and n detectors. The aim of the experiment was to investigate predicted modifications to the Δ excitation of nucleons and their subsequent propagation and decay, brought about by the nuclear medium. Differential cross sections are presented for photon energies spanning the Δ(1232) excitation region. The measurements are consistent with distorted wave impulse approximation calculations in which the amplitude for proton Δ excitation, followed by Δ propagation and decay to π + n, is reduced compared to that for a free p. However, because of uncertainties in the magnitudes of the final state interactions, it is concluded that improved calculations are required to obtain a quantitative estimate of Δ-medium effects.
Original languageEnglish
Pages (from-to)146031-146039
Number of pages9
JournalPhysical Review C
Issue number1
Publication statusPublished - 1 Jan 2000


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