Particle stability of the pentaneutron

Abstract

The pentaneutron (⁵n) binding properties are studied within a $\text{5}\text{h}\text{̷}\text{ω}$ model space. The results, based on the Sussex interaction, indicate that ⁵n is unbound by about 10 MeV. The ⁵n ground state has the assignment $\text{(J}{}^{\mathrm{\pi }}\text{,T)=(}\text{3}\text{2}{}^{\mathrm{-}}\text{,}\text{5}\text{2}\text{)}$. The model also suggests the lowest $\text{(}\text{3}\text{2}{}^{\mathrm{-}}\text{,}\text{5}\text{2}\text{)}$ state in ⁵He will occur at about 40 MeV excitation energy.