Invariant-mass distributions for the pp \( \rightarrow\) pp\( \eta\) reaction at Q = 10 MeV
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Proton-proton and proton-\( \eta\) invariant-mass distributions and the total cross-section for the pp\( \rightarrow\)pp\( \eta\) reaction have been determined near the threshold at an excess energy of Q = 10 MeV. The experiment has been conducted using the COSY-11 detector setup and the cooler synchrotron COSY. The determined invariant-mass spectra reveal significant enhancements in the region of low proton-proton relative momenta, similarly as observed previously at higher excess energies of Q = 15.5 MeV and Q = 40 MeV.
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