Candidates for the 5$\hat{I}\pm$ condensed state in ${}^{20}$Ne

Abstract

We conducted the coincidence measurement of $\hat{I}\pm$ particles inelastically scattered from ${}^{20}$Ne at $0^{\circ }$ and decay charged particles in order to search for the alpha-particle condensed state. We compared the measured excitation-energy spectrum and decay branching ratio with the statistical-decay-model calculations, and found that the newly observed states at $E_x$ = 23.6, 21.8, and 21.2 MeV in ${}^{20}$Ne are strongly coupled to a candidate for the 4$\hat{I}\pm$ condensed state in ${}^{16}$O. This result presents the first strong evidence that these states are the candidates for the 5$\hat{I}\pm$ condensed state.

6 pages, 5 figures. The part of the analysis is updated, and some discussions are added