Feasibility of an experimental search for a resonance of a pion and a light nucleus

Abstract

A hypothesis is proposed herein, suggesting that a pion-nuclear resonance may be observed in the $\alpha +d\to {}^6\mathrm{Li}(3.563)+{\pi }^0$ reaction. The resonance has a $\pi NN\alpha$ structure, containing $\alpha NN$ and $\pi NN$ subsystems. The former corresponds to the $A=6$ isotriplet (${}^6{\mathrm{He}}_{\text{g.s.}}$, ${}^6\mathrm{Li}(3.563)$, ${}^6{\mathrm{Be}}_{\text{g.s.}}$), whereas the latter is a hypothetical $NN$-decoupled dibaryon. We propose an experiment to search for this resonance using the ${}^7\mathrm{Li}(p,d)$ reaction.

7 pages, 2 figures; accepted for publication in PTEP

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