Eta-mesic nuclei: past, present, future

Abstract

Eta-mesic nucleus or the quasibound nuclear state of an eta ($\eta$) meson in a nucleus is caused by strong-interaction force alone. This new type of nuclear species, which extends the landscape of nuclear physics, has been extensively studied since its prediction in 1986. In this paper, we review and analyze in great detail the models of the fundamental $\eta$--nucleon interaction leading to the formation of an $\eta$--mesic nucleus, the methods used in calculating the properties of a bound $\eta$, and the approaches employed in the interpretation of the pertinent experimental data. In view of the successful observation of the $\eta$--mesic nucleus ${}^{25}$Mg${}_{\eta }$ and other promising experimental results, future direction in searching for more $\eta$--mesic nuclei is suggested.

41 pages, 8 figures

References in corpus (8)

• Measurement of the dp -->3He eta reaction near threshold
• Coupled-channels study of the ${\pi }^{-}p\to \eta n$ process
• In-medium Eta-Nucleon interactions and Eta nuclear bound states
• Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium
• Search for Quasi Bound $\eta$ Mesons
• Interference and nuclear medium effects on the eta-mesic nuclear spectrum
• Search for eta-mesic nuclei with WASA-at-COSY
• Transformations between complex scattering length and binding energy

Cited by in corpus (17)

• Measurement of excitation spectra in the ${}^{12}$C$(p,d)$ reaction near the ${\eta }^{\prime }$ emission threshold
• Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility
• Determination of the ${\mathbf{\eta }}^3\mathrm{He}$ threshold structure from the low energy $\mathbf{pd}\to {\mathbf{\eta }}^3\mathrm{He}$ reaction
• Proton-${\eta }^{\prime }$ interactions at threshold
• Constraining the optical potential in the search for eta-mesic 4He
• $\eta$-nucleus interaction from the $d+d$ reaction around the $\eta$ production threshold
• Meson-baryon scattering to one-loop order in heavy baryon chiral perturbation theory
• Momentum distribution of N${}^{\ast }$ in nuclei
• Resonance-like structure near the $\eta d$ threshold in the $\gamma d${$\to$}${\pi }^0\eta d$ reaction
• Upper limits for the production of the eta-mesic Helium in the dd ->3Henpi0 and dd -> 3Heppi- reactions
• Low-energy $\eta$-nucleon interaction studied with $\eta$ photoproduction off the deuteron
• Etaprime interactions with nucleons and nuclei
• $\eta$ and ${\eta }^{\prime }$ mesons in nuclear matter and nuclei
• Formation of eta'(958) Meson Bound States by the 6Li(gamma,d) reaction
• $\eta$ photoproduction off the deuteron and low-energy $\eta$-nucleon interaction
• Production and interaction of the eta meson with nucleons and nuclei
• Dynamical coupled-channels approach to electroweak meson productions on nucleon and deuteron