Cross-Section Measurements of the ¹¹B(p,α)2α Reaction near the First Resonant Energy

Figure 1

Experimental setup. (a) The proton beam passed through the magnetic quadrupled lens and the Faraday cup and then was focused onto (b) the target (grey) and CR-39 type track detector (orange-yellow). The proton energy scan was performed from 140 keV to 172 keV in steps of 4 keV near the Ep = 163 keV resonance, forming 9 spots with 4 mm intervals. The irradiation time for each energy is approximately 200 s, with a beam current of about 1 μA. The particles collected by any region (for example, the red circle) of the CR-39 track detector are the contribution of all nine incident proton beams.

(a)

(b)