Are there eta-Helium bound states?

Abstract

Using multiple scattering theory the scattering lengths of $\eta$ mesons on helium nuclei are calculated and checked against final state $\eta$ interactions from the $pd\to {\eta }^3$He and $dd\to {\eta }^4$He reactions. The existence of an ${\eta }^4$He quasibound state is indicated.

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