A semi-exclusive 12C(p,d) measurement with high-momentum backward proton tagging finds near-threshold structures consistent with eta-prime-11C bound states, with a best-fit optical potential depth of about -61 MeV at 2.1 sigma global significance.
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Excitation Spectra of the ${}^{12}{\rm C}(p,d)$ Reaction near the $\eta'$-Meson Emission Threshold Measured in Coincidence with High-Momentum Protons
A semi-exclusive 12C(p,d) measurement with high-momentum backward proton tagging finds near-threshold structures consistent with eta-prime-11C bound states, with a best-fit optical potential depth of about -61 MeV at 2.1 sigma global significance.