EXTENDED OPTICAL MODEL ANALYSES FOR <SUP>9</SUP>Be+<SUP>144</SUP>Sm SYSTEM NEAR COULOMB BARRIER ENERGIES

초록

Within the framework of an extended optical model, we study elastic scattering and fusion cross section data for Be-9 + Sm-144 system near Coulomb barrier energies to determine the polarization potential decomposed into direct reaction and fusion parts. We show that the direct reaction and fusion potentials extracted from chi(2) analyses separately satisfy the dispersion relation and that the threshold anomaly exhibits in the fusion part. The analyses using only elastic scattering and fusion data can furnish very consistent and reliable predictions of cross sections even though the direct reaction cross section data are not enough. From these analyses, we also obtain the semi-experimental alpha single and alpha-alpha coincidence cross sections, sigma(alpha single) (semi-exp) and sigma(alpha-alpha coincidence) (semi-exp), for Be-9 + Sm-144 system.

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