Dynamic polarization potential of $^{12}$C+$^{12}$C system at molecular-resonance energies

M. Ito; Y. Sakuragi; Y. Hirabayashi

doi:doi:10.1007/s100500050300

2021 Impact factor 3.131

Hadrons and Nuclei

Eur. Phys. J. A 5, 373-383

Dynamic polarization potential of ¹²C+¹²C system at molecular-resonance energies

M. Ito¹ - Y. Sakuragi¹ - Y. Hirabayashi²

¹ Department of Physics, Osaka City University, Osaka 558, Japan
² Center for Information Processing Education, Hokkaido University, Sapporo 060, Japan

Received: 17 December 1998 / Revised version: 1 March 1999 Communicated by C. Signorini

Abstract
The nuclear reaction dynamics leading to the formation of recently discovered resonance in the mutual-0₂⁺ channel of the ¹²C+¹²C inelastic scattering around $E_{\rm c.m.}\simeq 32$ MeV is studied in terms of the dynamic polarization potential (DPP) induced by the channel coupling among various excited states in ¹²C. The microscopic 3 $\alpha$ cluster-model wave functions are used to generate the ¹²C-¹²C diagonal and coupling potentials in the double-folding model. It is found that DPP for the 0₂⁺+0₂⁺ channel is an unusually strong attractive potential which even exceeds the zeroth-order folding-model potential of this channel around the nuclear surface region and that the strong coupling between the 0₂⁺ and 2₂⁺ states is predominantly responsible for the unusual DPP in this channel. The effective potential, the sum of the original folding-model potential and the attractive DPP, is found to generates resonance states in the same energy region as that of the resonance states generated by the original folding-model potential but the former states are found to be higher-nodal states having four additional radial nodes. Similar but more moderate property of DPP is also found in the entrance (elastic) channel. These results suggest that the reaction dynamics of generating the resonance in the ¹²C(0₂⁺)+¹²C(0₂⁺) channel may rather differ from that of the simple crossing of the zeroth-order molecular band generated by the potentials in the entrance and exit channels suggested by the standard band-crossing model.