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

TL;DR

This paper proposes an experimental approach to detect a hypothesized pion-nuclear resonance involving light nuclei and a pion, which could reveal new nuclear states and structures.

Contribution

It introduces a novel hypothesis of a pion-nuclear resonance with specific substructures and suggests an experimental method to observe it.

Findings

Hypothesized resonance has a specific $ ext{A}=6$ nuclear structure.

Proposed experiment uses the $^7 ext{Li}(p,d)$ reaction to search for the resonance.

The resonance involves a $ ext{π}NN ext{α}$ structure with potential dibaryon characteristics.

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.