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

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

2000-11-04

arxiv.org/abs/nucl-ex/0011005v1

Physics

Nuclear Physics

Nuclear Experiment

9 pages, 8 figures. Talk given by G.A.S. at the IX Intern. Seminar "Electromagnetic Interactions of Nuclei at Low and Medium E

Scientific paper

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 \gamma + 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.

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