Fig. 3 (IMAGE)
Caption
Excitation-energy spectrum of the carbon-11 nucleus obtained in the present experiment. The excitation energy on the horizontal axis is defined such that zero corresponds to the production of an η′ meson at rest in vacuum. Negative values correspond to bound states of the η′ meson and the nucleus. The circles represent the experimental data, and the vertical bars indicate statistical uncertainties. The solid curve shows the theoretical spectrum that best reproduces the experimental data, while the dotted curve represents the estimated contribution from background processes. The two observed peak structures suggest the existence of η′ meson bound states in an inner (blue) and outer (blue) nuclear orbits in the carbon-11 nucleus.
Credit
Kenta Itahashi
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