Effects of Coulomb quadrupole excitation in heavy-ion reactions

초록

For C-12 + W-184, O-18 + W-184, and Ne-20 + Pb-208 systems, we investigate the suppression of the ratios P (E) = sigma (el)/sigma (RU) by using the Coulomb quadrupole excitation (CQE) potentials. In order to explain the effect of the CQE potentials, we first use a well-known Love's CQE potential, and reproduce the experimental P (E) data well by using this potential. We also introduce a simple CQE potential written as W (CQE)(r) = -W (P) /r (n) , which is much simpler than the conventional Love's potential, to investigate the suppression of the P (E) ratios. Using this potential, we perform a chi(2) analysis to find the adjustable parameter n, then, we find that the best fit parameters n ae 5 is close to the lowest order term, 1/r (5). Consequently, we find that using the simple CQE potential explains the experimental P (E) data and that the ratio P (E) depends on the n values sensitively.

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