Evidence for a large radius of the <SUP>11</SUP>Be projectile

초록

We investigate ratios of the elastic scattering cross section to Rutherford cross section, PE, and angular distributions of breakup cross section by using an optical model which exploits various long-range dynamic polarization potentials as well as short-range nuclear bare potentials for the Be-11 projectile. From these simultaneous analyses, we extract a large radius of a halo projectile from the experimental data for PE and the angular distribution of the breakup cross section of the Be-11 + Zn-64 and Be-11 + Sn-120 systems. It results from the fact that a large radius for the long-range nuclear potential is more reasonable for properly explaining these data simultaneously. The extracted reduced interaction radius turns out to be r(0) = 3.18 similar to 3.61 fm for Be-11 nucleus, which is larger than the conventional value of r(0) = 1.1 similar to 1.5 fm used in the standard radius form R = r(0)A(1/3). Furthermore, the larger radius as well as the normalization constant N is shown to be important for understanding Coulomb dipole strength distribution.

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