Elastic scattering of the ${}^{12}\mathrm{B}+{}^{58}\mathrm{Ni}$ system at near-barrier energies

Elastic scattering of a radioactive neutron-rich boron isotope, ${}^{12}\mathrm{B}$, has been measured for the first time. Angular distributions for the elastic scattering of ${}^{12}\mathrm{B}+{}^{58}\mathrm{Ni}$ have been measured at ${\mathit{E}}_{\mathrm{Lab}}=30.0$ and 33.0 MeV, which are just above the Coulomb barrier (${\mathit{V}}_{\mathrm{B}}=24$ MeV). The obtained angular distributions were analyzed in terms of the large-scale coupled channel (CC) and coupled reaction channel (CRC) calculations, where several inelastic transitions for the target, as well as the most relevant transfer reactions, have been included in the coupling matrix elements. The roles of the spin reorientation and spin-orbit interaction in the reaction mechanism were also investigated. The one-neutron transfer reaction through a coupled reaction calculation had some effect on the elastic scattering of the system studied.

Figure 1

A typical bidimensional $\mathrm{\Delta }\mathit{E}-\mathit{E}$ spectrum for the ${}^{12}\mathrm{B}+{}^{58}\mathrm{Ni}$ measured at ${\theta }_{\mathrm{Lab}}=18.0^{\circ }$ and ${\mathit{E}}_{\mathrm{Lab}}=30.0$ MeV. The beam contaminants are indicated.

Figure 2

A typical energy spectra for the ${}^{12}\mathrm{B}+{}^{58}\mathrm{Ni}$ measured at ${\theta }_{\mathrm{Lab}}=59.0^{\circ }$ and ${\mathit{E}}_{\mathrm{Lab}}=33.0$ MeV. The peak for the ${}^{12}\mathrm{B}$ scattering particles is indicated.

Figure 3

Elastic scattering angular distributions for the ${}^{12}\mathrm{B}+{}^{58}\mathrm{Ni}$ system at ${\mathit{E}}_{\mathrm{Lab}}=30.0$ and 33.0 MeV. The lines are results of coupled channel calculations as indicated.

Figure 4

Coupling scheme of the projectile and target overlaps used in the one-neutron striping transfer reaction.

Figure 5

Coupling scheme of the projectile and target overlaps used in the one-proton pickup transfer reaction.

Figure 6

Elastic scattering angular distributions for the ${}^{12}\mathrm{B}+{}^{58}\mathrm{Ni}$ system at ${\mathit{E}}_{\mathrm{Lab}}=30.0$ and 33.0 MeV. The lines are results of coupled reaction channel calculations as indicated.

Figure 7

Elastic scattering angular distribution for the ${}^{12}\mathrm{B}+{}^{58}\mathrm{Ni}$ system at ${\mathit{E}}_{\mathrm{Lab}}=30.0$ and 33.0 MeV. The lines corresponds to the inclusion of spin-orbit potential in the calculations.