Cross section for non-Rutherford backscattering of α on Be

Stopping power of helium gas for 9Be ions from 2 to 31MeV

“…As seen in Fig. 2, there are large differences between our excitation function and those of [5] and [6]. These differences can be attributed to the inaccurate stopping powers used to transform the experimental a-particle spectrum into the excitation function.…”

“…Experimental data were used for the stopping power of helium for 9 Be whereas the stopping power of helium for the recoiling a-particles was calculated using ASTAR [17]. The thick and thin lines show the data of [5] and [6], respectively, obtained using direct kinematics and thin targets. The upper scale shows the mean c.m.…”

“…2). For comparison we also show the excitation functions for the same system measured by Goss et al [5] (thick line) and Liu et al [6] (thin line) in standard experiments using thin 9 Be targets and varying the 4 He beam energy. As seen in Fig.…”

“…[4]. Moreover, the elastic excitation function of the 9 Be + a system has been measured [5,6] strong resonance observed at E c.m. % 3.5 MeV in these experiments [5,6] can represent a good reference for comparison.…”

“…Stopping powers for9 Be and 4 He in helium were taken from SRIM-2003. The thick and thin lines show the data of[5] and[6], respectively, obtained using 4 He beams impinging onto thin9 Be targets. The upper scale shows the mean c.m.…”