New experimental data on the inelastic scattering of α-particles on 13C at \(E(\alpha ) = 65\) and 90 MeV with the excitation of the \(1{\text{/}}2_{3}^{ - }\) state are reported. Data are analyzed using the modified diffraction model. The determined rms radius of this state coincides within errors with the radius of the \(1{\text{/}}2_{2}^{ - }\) 8.86 MeV state in 13C and the Hoyle state in 12C. This result is an argument for a similar structure of these states. The unusual result for the compact 3/2– 9.90 MeV state in 13C has been tested by considering its isobar-analog 3/2– 9.48 MeV state in 13N. It has been found that these states have a normal non-increased radius.
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This work was supported by the Russian Foundation for Basic Research, project no. 20-32-70115.
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Demyanova, A.S., Danilov, A.N., Dmitriev, S.V. et al. Search for Exotic States in 13C. Jetp Lett. 114, 303–308 (2021). https://doi.org/10.1134/S0021364021180016
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DOI: https://doi.org/10.1134/S0021364021180016