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Effects of rotation and valence nucleons in molecular α-chain nuclei

Effects of rotation and valence nucleons in molecular linear α- chain nuclei are analyzed using a threedimensional lattice cranking model based on covariant density functional theory. The structure of the mirror nuclei ^16C and ^16Ne is investigated as a function of rotational frequency. The valence nucleons, with respect to the 3α linear chain core of ^12C, at low frequency occupy the π molecular orbital. With increasing rotational frequency these nucleons transition from the π orbital to the σ molecular orbital, thus stabilizing the 3α linear chain structure. It is predicted that the valence protons in 16Ne change occupation from the π to the σ molecular orbital at ħω ≈ 1.3 MeV, a lower rotational frequency compared to ħω ≈ 1.7 MeV for the valence neutrons in 16C. The same effects of valence protons are found in ^20Mg, compared to the four valence neutrons in ^20O. The model is also used to examine the effect of alignment of valence nucleons on the relative positions and size of the three α clusters in the mirror nuclei ^16C and ^16Ne.

molecular linear α-chain nuclei

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