On quasi-bound states in eta-nucleys systems
The optical potential for the $η$-meson is calculated. This is based on a new determination of a large $η$-N scattering length and recent experiments of $η$ production in two nucleon collisions. These determine the $η$ - nuclear potential well to be about 45 MeV deep and able to support S, P, D and F quasibound states. Some of the higher angular momentum states are fairly narrow and offer a chance of experimental detection.
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