arXiv subjects

A. Fix

Publications and source records attributed to A. Fix.

74 records · Page 5Linked to original sources

arXiv1997

Influence of final state interaction on incoherent η-photoproduction on the deuteron near threshold

Incoherent $η$-photoproduction on the deuteron is studied for photon energies from threshold up to 720 MeV. The elementary $γN \to ηN$ amplitude is constructed in the frame of a conventional isobar model. Effects of final state interaction are investigated and their role in the cross section as well as in polarization observables is found to be important. Inclusion of such effects leads to a satisfactory agreement with experimental data in the near threshold region. In addition, recent experimental results on the coherent reaction $d(γ,η)d$ are discussed.

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arXiv1997

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

Coherent $η$ meson photoproduction on $^4$He and $^{12}$C is considered in the near-threshold region. The elementary $η$ 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 $ω$ exchange. Furthermore, the influence of Fermi motion and of different prescriptions for the choice of the invariant reaction energy $W_{γN}$ in the elementary amplitude is studied.

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