Elsevier

Nuclear Physics A

Volume 480, Issue 2, 4 April 1988, Pages 323-341
Nuclear Physics A

Breakup effects of 6,7li on elastic and inelastic scattering from 12C at 18–28 MeV/nucleon

https://doi.org/10.1016/0375-9474(88)90400-9Get rights and content

Abstract

The differential cross sections for elastic scattering of 6,7Li from 12C and inelastic one from the lowest three excited states of 12C have been measured at bombarding energies of 18–28 MeV/nucleon. Theoretical analyses of the data have been performed in which consistent treatments of density distributions for the ground and excited states of both projectile and target nuclei are made in the framework of microscopic cluster models for 6,7Li and 12C and projectile-target interactions are generated by the double folding of the M3Y effective nucleon-nucleon interaction. About 25% reduction of the real part of folded potentials is required both in the analyses of elastic scattering with the single-channel calculation and in those of inelastic scattering with the coupled-channel calculation including the excited states of 12C. This reduction can be explained as a projectile breakup effect on elastic and inelastic scattering in comparison with a coupled-discretized-continuum-channels (CDCC) calculation and an extended CDCC one which allows mutual excitations of both projectile and target nuclei for 6Li case, respectively. It is also seen that an effect due to the target excitation on elastic scattering is of less importance than that of the 6,7Li projectile breakup processes even fora deformed nucleus like 12C. Discrepancy between the extended CDCC calculation and inelastic data for the 0+2 state of 12C suggests a strong influence from the 12C → 3α breakup channels in the 6Li case.

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    This experiment was performed at the Research Center for Nuclear Physics, Osaka University, under program Numbers 14A13 and 16A05. The numerical calculations were carried out with FACOM-M382 at the Computer Center of Kyushu University, with FACOM-M380 at the Institute for Nuclear Study (INS) University of Tokyo and with FACOM-M200 at the Research Center for Nuclear Physics (RCNP), Osaka University, with financial support from RCNP and INS.

    The authors wish to thank Dr. T. Itahashi for his great effort on production and acceleration of Li ions and the cyclotron crew for their fine operation of 6,7Li beams during the experiments.

    Present address: College of General Education, Osaka University, Toyonaka, Osaka, 560, Japan.

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    Present address: National Laboratory for High Energy Physics, Oho-machi, Tsukuba, Ibaraki, 305, Japan

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    Present address: Department of Physics, Osaka City University, Sumiyoshi-ku, Osaka, 558, Japan

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