Abstract:
The cross section for the 12C((γ,π+p)) reaction was measured in the range of the Δ(1232) isobar. The data were analyzed using the models taking into account the nucleon and isobaric degrees of freedom of the 12C nucleus. The conclusion is drawn that in the large-momentum transfer range the π+p pairs are produced in the course of the direct knocking-out of Δ++ isobar from the nucleus. The probability of finding the Δ isobar in the ground-state 12C nucleus is estimated at 0.018±0.005Δ isobars per nucleon.
Citation:
V. M. Bystritskii, I. V. Glavanakov, P. Grabmayer, Yu. F. Krechetov, O. K. Saigushkin, A. N. Tabachenko, A. I. Fiks, E. N. Shuvalov, “Estimate of the Δ(1232) component in the 12C nucleus”, Pis'ma v Zh. Èksper. Teoret. Fiz., 73:9 (2001), 513–516; JETP Letters, 73:9 (2001), 453–456