Elastic scattering of ${}^{10}\mathrm{Be}$ on ${}^{208}\mathrm{Pb}$ near the Coulomb barrier

The elastic scattering of ${}^{10}\mathrm{Be}$ on ${}^{208}\mathrm{Pb}$ has been measured over a range of energies near the nominal Coulomb barrier. An excitation function for the total reaction cross section is obtained from the elastic-scattering angular distributions and compared with existing fusion data. Comparisons are also made with existing fusion, transfer∕breakup, and elastic data for ${}^9\mathrm{Be}$ incident on ${}^{209}\mathrm{Bi}$. A strong enhancement in the sub-barrier total reaction cross section for ${}^9\mathrm{Be+}{}^{209}\mathrm{Bi}$ relative to ${}^{10}\mathrm{Be+}{}^{208}\mathrm{Pb}$ is demonstrated.

Figure 1

Elastic-scattering angular distributions for ${}^{10}\mathrm{Be}$ incident on ${}^{208}\mathrm{Pb}$. The corresponding laboratory energies are indicated. See text for a discussion of the curves.

Figure 2

Total reaction cross sections from elastic scattering of ${}^{10}\mathrm{Be+}{}^{208}\mathrm{Pb}$ (square points). Also shown are the fusion cross sections for ${}^{10}\mathrm{Be}+{}^{209}\mathrm{Bi}$ reported in Ref. 11 (circles). See text for a discussion of the curves.

Figure 3

Reaction cross sections for ${}^9\mathrm{Be+}{}^{209}\mathrm{Bi}$ measured by Signorini et al. See text for a discussion of these data.