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Hadrons and Nuclei


Eur. Phys. J. A 11, 231-235 (2001)

Exchange interaction between intermediate D13(1520)-hole and S11(1535)-hole states in the near-threshold coherent ${\eta}$ photoproduction from nuclei

V.V. Balashov, V.K. Dolinov and M.M. Kaskulov

Institute of Nuclear Physics, Moscow State University, Moscow 119899, Russia

kaskulov@mail.ru

(Received: 20 February 2001 Communicated by V. Vento)

Abstract
Coherent ${\eta}$-meson photoproduction from nuclei is considered within an extended analogue of the $\Delta$-hole model taking into account the configuration mixing of baryon-hole excitations of different sorts of baryons. Calculated integrated and differential cross-sections for reactions ${^{12}C(\gamma,\eta)^{12}C_{g.s.}}$ and ${^{16}O(\gamma,\eta)^{16}O_{g.s.}}$ demonstrate the important role of the exchange interaction between intermediate D13(1520)-hole and S11(1535)-hole excitations.

PACS
14.20.Gk - Baryon resonances with S=0 .
14.40.-n - Mesons.
25.20.Lj - Photoproduction reactions.
27.20.+n - $6 \leq A \leq 19 $ .

© Società Italiana di Fisica, Springer-Verlag 2001