Speaker
Description
In our previous study, we found that the ${}^8\mathrm{He}(0_2^+)$ state is dominantly described by a weakly bound $\alpha + {}^2n + {}^2n$ cluster structure, and we pointed out its similarity to the $3\alpha$ gas-like state in ${}^{12}\mathrm{C}$. Based on this observation, it is considered weakly bound 3-body $S$-wave cluster states (here denoted as "3-cluster gas states") tend to appear near their corresponding energy thresholds. However, our calculations also indicate that the ${}^8\mathrm{He}(0_2^+)$ state involves a mixing between a spatially correlated $\alpha + {}^2n$ configuration and a distant ${}^2n$ cluster.
To clarify the origin of the 3-cluster gas state, we systematically vary the inter-cluster interactions between $\alpha$-${}^2n$ and ${}^2n$-${}^2n$ and demonstrate the emergence of a pure $\alpha+{}^2n+{}^2n$ 3-cluster gas state in the $0_2^+$ state. Through this analysis, we find that 3‑cluster gas states appear when the inter‑cluster interactions are taken to be identical, indicating that the 3‑cluster gas is a universal feature that can arise not only in systems of identical bosons but also in non‑identical cluster systems.