Coupled-Channels Study of the Nuclear Rainbow Phenomena for the ^<16>O + ^<16>O System

概要

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We investigate refractive phenomena of the ^<16>O + ^<16>O system at E_<lab> = 124, 145, 250 and 350 MeV using the microscopic coupled-channels method. The coupling potentials are constructed by the double folding model using the three effective nucleon-nucleon interactions, M3Y, DDM3Y-ZR and DDM3Y-FR (DDM3Y1). With respect to the transition density matrix elements of the ^<16>O nucleus, we employ the orthogonal condition model based on the microscopic α+ ^<12>C cluster picture. We perform coupled-channels calculations that include both the 3^-_1 (E_<ex> = 6.13 MeV) and the 1^-_1 (E_<ex> = 7.12 MeV) excitations of the ^<16>O nucleus. We show that the characteristic features of the nuclear rainbow phenomena can be reproduced successfully by our coupled-channels calculations with the DDM3Y-FR folding potential. The absolute values of the experimental cross sections for inelastic scattering at E_<lab> = 350 MeV can also be reproduced by our calculation. The coupling effects from inelastic channels are mainly absorptive and weakly repulsive in the refractive phenomena at these energies in the ^<16>O + ^<16>O system.
理論物理学刊行会の論文
2002-02-25