Coherent $η$-photoproduction on $^4$He and $^{12}$C in the near-threshold region

Details Coherent $η$-photoproduction on $^4$He and $^{12}$C in the near-threshold region Coherent $η$-photoproduction on $^4$He and $^{12}$C in the near-threshold region

1997-02-28

arxiv.org/abs/nucl-th/9703002v1

Nucl.Phys. A620 (1997) 457-474

Physics

Nuclear Physics

Nuclear Theory

27 pages revtex including 9 postscript figures

Scientific paper

10.1016/S0375-9474(97)00179-6

Coherent $\eta$ meson photoproduction on $^4$He and $^{12}$C is considered in the near-threshold region. The elementary $\eta$ photoproduction operator includes contributions from the $S_{11}(1535)$ and $D_{13}(1520)$ resonances as well as $t$-channel vector meson exchange and the nucleon pole terms. Due to the suppression of the dominant $S_{11}(1535)$ resonance for spin and isospin saturated nuclei, the reaction is mainly governed by $\omega$ exchange. Furthermore, the influence of Fermi motion and of different prescriptions for the choice of the invariant reaction energy $W_{\gamma N}$ in the elementary amplitude is studied.

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