Figure 1

Ratio between the differential cross sections for elastic scattering and the Rutherford values measured for the systems $\alpha +{}^{\mathrm{40}}\mathrm{C}\mathrm{a}$ and $\alpha +{}^{\mathrm{44}}\mathrm{T}\mathrm{i}$ at a center-of-mass energy of 21.8 MeV. The cross sections for the ${}^{\mathrm{44}}\mathrm{T}\mathrm{i}$ target are smaller than the ones for ${}^{\mathrm{40}}\mathrm{C}\mathrm{a}$ by 1–2 orders of magnitude. The solid lines are the result of optical model calculations using a double-folding potential for the real part and a Woods-Saxon parametrization for the imaginary part. See text for details.Reuse & Permissions

Figure 2

Angle-integrated yields for elastic scattering of $\alpha$ particles at energies around 25 MeV on various targets between $A=32$ and $58$ plotted in the $(N,Z)$ plane. The size of the squares is proportional to the cross section integrated over the angular range ${\theta }_{\mathrm{c}\mathrm{.}\mathrm{m}\mathrm{.}}=140°–180°$. The solid lines indicate the location of the magic neutron and proton numbers in this mass range. The dashed line follows the $Z=N$ nuclei. The solid squares are obtained from the present experiment, while the open squares are data taken from the literature.Reuse & Permissions

Figure 3

Differential cross sections for elastic scattering (solid points) and inelastic excitation of the first $2^{+}$ (open points) in ${}^{\mathrm{44}}\mathrm{T}\mathrm{i}$. The solid lines are the result of optical model (elastic) and DWBA (inelastic) calculations described in the text.Reuse & Permissions