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

Abstract

The differential cross section for the ${}^{12}$C$(\gamma ,{\pi }^{+}p)$ reaction has been measured in the $\Delta$(1232) resonance region at high recoil momenta of the residual nuclear system. The data are analyzed under the assumption that the formation of the ${\pi }^{+}p$ pairs may be interpreted as a $\gamma {\Delta }^{++}\to {\pi }^{+}p$ process which takes place on a ${\Delta }^{++}$ preexisting in the target nucleus. Estimates of the ${\Delta }^{++}$ momentum distribution ${\rho }_{{\Delta }^{++}}(\bar{p})$=0.17 fm${}^3$ for a mean momentum $\bar{p}=300\pm 49$ MeV/c as well as the number of $\Delta$ isobars per nucleon $N_{\Delta }=0.017$ were obtained for ${}^{12}$C.

25 pages LaTeX2e, 7 eps figures

References in corpus (3)

• Determination of Decuplet Baryon Magnetic Moments from QCD Sum Rules
• Magnetic moments of the SU(3) decuplet baryons in the chiral quark-soliton model
• Photopion reactions on deltas preexisting in nuclei

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• Photoproduction of ${\pi }^{+}p$ Pairs on the ${}^{16}$O Nucleus and Isobar Configurations
• Isobar configurations: $\Delta N$ correlations versus the independent particle model