Fig. 9: Additional angular correlation analyses.

The paired figures (a, b), (c, d), (e, f), and (g, h) present angular correlation spectra (black squares) for the 15.6, 13.9, 14.9, and 17.3 MeV states, respectively, with each pair compared to the sum (red-solid line) of a Legendre polynomial \(| {P}_{J}(\cos {\psi }^{{\prime} }){| }^{2}\) of order J (blue-dotted line) and the background (gray-dashed line). For each figure, the projected data with spin-J assumption different from that adopted in Fig. 4 is compared with the corresponding Legendre polynomial. All curves have been corrected by simulated efficiencies and resolutions. The error bars represent the statistical uncertainties (one standard deviation). The corresponding reduced \({\widetilde{\chi }}^{2}\) are also indicated.