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

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

2001-12-25

arxiv.org/abs/nucl-ex/0112013v2

Nucl.Phys. A705 (2002) 55-72

Physics

Nuclear Physics

Nuclear Experiment

25 pages LaTeX2e, 7 eps figures

Scientific paper

10.1016/S0375-9474(02)00625-5

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 $\bar{p}=300\pm49$ MeV/c as well as the number of $\Delta$ isobars per nucleon $N_\Delta=0.017$ were obtained for $^{12}$C.

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