Differential double capture cross sections in $p+\mathrm{He}$ collisions

We have measured differential double capture cross sections for 15 to $150\mathrm{keV}$ $p+\mathrm{He}$ collisions. We also analyzed differential double to single capture ratios, where we find pronounced peak structures. An explanation of these structures probably requires a quantum-mechanical description of elastic scattering between the projectile and the target nucleus. Strong final-state correlations have a large effect on the magnitude of the double capture cross sections.

Figure 1

Differential double capture cross sections in $p+\mathrm{He}$ collisions for projectile energies as indicated in the legends.

Figure 2

Differential double to single capture ratios. The single capture cross sections were taken from Hasan et al. [12] for 25, 50, and $75\mathrm{keV}$ (see Fig. 3) and from Martin et al. [40] for $100\mathrm{keV}$.

Figure 3

Differential single capture cross sections in $p+\mathrm{He}$ collisions for projectile energies as indicated in the legends. The data were obtained in the experiment reported in Ref. 12.

Figure 4

Peak height of the structure in $R_{\mathrm{DC}}$ around 0.6 to $0.8\mathrm{mrad}$ in Fig. 2 as a function of projectile energy.