First experimental results on creation and decay of eta-mesic nuclei

Sokol, G. A.; Aibergenov, T. A.; Koltsov, A. V.; Kravtsov, A. V.; Krutov, Yu. I.; L'vov, A. I.; Pavlyuchenko, L. N.; Pavlyuchenko, V. P.; Sidorin, S. S.

First experimental results on creation and decay of eta-mesic nuclei

Authors

Description

First experimental results on photoproduction of eta-mesic nuclei are analyzed. In an experiment performed at the 1 GeV electron synchrotron of the Lebedev Physical Institute, correlated (pi+,n) pairs arising from the reaction γ+ C12 -> N + (A-1)_eta -> N + (pi+,n) + (A-2) and flying transversely to the photon beam have been observed. When the photon energy exceeds the eta-meson production threshold, a distribution of the (pi+,n) pairs over their total energy is found to have a peak in the subthreshold region of the internal-conversion process eta p -> pi+ n which signals about formation of eta-mesic nuclei.
9 pages, 8 figures. Talk given by G.A.S. at the IX Intern. Seminar "Electromagnetic Interactions of Nuclei at Low and Medium Energies", Sep 20-22, 2000, Moscow