Resolution of a Dilemma inNe20

Abstract

Spectroscopic strengths of $0^{+}$ states observed in the reaction ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}({}_{}{}^3{}_{}{}^{}\mathrm{He},d){}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$, together with calculations of $\alpha$-particle widths, imply that the large $\alpha$ width of the 6.72-MeV state arises from mixing with a state of $\mathrm{fp}$-shell character. A long-standing dilemma is thus resolved.