Search for Delta^++ component in 12^C ground state using 12^C(gamma, pi^+ p) reaction

V. M. Bystritsky; A. I. Fix; I. V. Glavanakov; P. Grabmayr; Yu. F. Krechetov; O. K. Saigushkin; E. N. Schuvalov; A. N. Tabachenko

doi:10.1016/s0375-9474(02)00625-5

arXiv · nucl-ex/0112013

Search for Delta^++ component in 12^C ground state using 12^C(gamma, pi^+ p) reaction

V. M. Bystritsky·A. I. Fix·I. V. Glavanakov·P. Grabmayr·Yu. F. Krechetov·O. K. Saigushkin·E. N. Schuvalov·A. N. Tabachenko

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Abstract

The differential cross section for the $^{12}$C$(γ,π^{+}p)$ reaction has been measured in the $Δ$(1232) resonance region at high recoil momenta of the residual nuclear system. The data are analyzed under the assumption that the formation of the $π^+p$ pairs may be interpreted as a $γΔ^{++}\toπ^+p$ process which takes place on a $Δ^{++}$ preexisting in the target nucleus. Estimates of the $Δ^{++}$ momentum distribution $ρ_{Δ^{++}}(\bar{p})$=0.17 fm$^3$ for a mean momentum $\bar{p}=300\pm49$ MeV/c as well as the number of $Δ$ isobars per nucleon $N_Δ=0.017$ were obtained for $^{12}$C.

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V. M. Bystritsky, A. I. Fix, I. V. Glavanakov, P. Grabmayr, Yu. F. Krechetov, O. K. Saigushkin, E. N. Schuvalov, A. N. Tabachenko. 2002-01-17. Search for Delta^++ component in 12^C ground state using 12^C(gamma, pi^+ p) reaction. https://doi.org/10.1016/s0375-9474(02)00625-5

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