Eta meson rescattering effects in the p + 6Li --> eta + 7Be reaction near threshold

Abstract

The p + 6Li --> eta + 7Be reaction has been investigated with an emphasis on the eta meson and 7Be interaction in the final state. Considering the 6Li and 7Be nuclei to be alpha-d and alpha-3He clusters respectively, the reaction is modelled to proceed via the p + d [alpha] --> 3He [α] + eta reaction with the alpha remaining a spectator. The eta meson interacts with 7Be via multiple scatterings on the 3He and alpha clusters inside 7Be. The individual eta-3He and eta-alpha scatterings are evaluated using few body equations for the eta-3N and eta-4N systems with a coupled channel eta-N interaction as an input. Calculations including four low-lying states of 7Be lead to a double hump structure in the total cross section corresponding to the $L=1(J=(1/2{)}^{-},(3/2{)}^{-})$ and $L=3(J=(5/2{)}^{-},(7/2{)}^{-})$ angular momentum states. The humps arise due to the off-shell rescattering of the eta meson on the 7Be nucleus in the final state.

New results and references added

References in corpus (14)

• Photoproduction of eta-mesic 3He
• eta-Nucleon Scattering Length and Effective Range uncertainties
• Quantum reflection and dwell times of metastable states
• Level crossing of particle-hole and mesonic modes in eta mesic nuclei
• Collision times in pi-pi and pi-K scattering and spectroscopy of meson resonances
• Bounds on the bound η^3He system
• Possible eta-mesic 3He states within the finite rank approximation
• Small eta-N scattering lengths favour eta-d and eta-alpha states
• Three-body mechanism of $\eta$ production
• A study of the $pd\to pd\eta$ reaction
• Few body impulse and fixed scatterer approximations for high energy scattering
• Eta-mesic nuclei in relativistic mean-field theory
• Evidence of Pentaquark States from K+ N Scattering Data?
• Comment on "Hadronic ${}^3$He$\eta$ production near threshold"

Cited by in corpus (5)

• Interaction of eta mesons with nuclei
• Search for Quasi Bound $\eta$ Mesons
• Study of the $\mathbf{p}{+}^6$Li$\to \mathbf{\eta }{+}^7$Be reaction 11.3 MeV above threshold
• Study of $K^{-}$ absorption at rest in nuclei followed by $p\Lambda$ emission
• $\eta$ bound state: theory and experiment