Speaker
Description
Optical potential is an important input quantity for the calculations of nuclear reactions. Usually, the optical potentials are obtained by fitting the experimental elastic scattering angular distributions. Through this approach, for a specific colliding system, several potential sets can be obtained with nearly equally good agreements. This is the long-standing optical potential ambiguity problem. However, it is found that the ambiguous potentials may exhibit different nearside/farside behaviors. On the other hand, the envelope method proposed by da Silveira and Leclercq-Willain can be used to decompose the experimental angular distribution data into positive-/negative-deflection-angle components. Inspired by the two aspects, we have developed an approach to deal with potential ambiguity problem based on the envelope method in our previous paper. In this approach, the theoretical nearside/farside angular distributions are compared with the “experimental” ones given by the envelope method to select the more physical potential set. The validity and capability of this approach for the “refractive/surface-transparent” potential ambiguity problem have been discussed by applying it to the colliding systems of 16O+28Si at 215.2 MeV and 12C+12C at 1016 MeV. In the present work, this approach is tested further by applying it to the colliding systems of 16O+12C at 608 MeV and 1503 MeV. It is found that this approach is useful to deal with the shallow- or deep-W ambiguity.
References
[1] M.S. Hussein, K.W. McVoy. Nearside and farside: the optics of heavy ion elastic scattering. Prog. Part. Nucl. Phys., 12, 103–170 (1984).
[2] R. da Silveira, Ch. Leclercq-Willain. On the separation of the nuclear and Coulomb rainbow components from the elastic scattering data. Z. Phys. A At. Nucl., 314, 63–67 (1983).
[3] L.Y. Hu, Y.S. Song. Trial application of the envelope method to the potential ambiguity problem. Nucl. Sci. Tech., 35, 8 (2024).
