Abstract
Energy straggling for fast proton beams passing through solids has been investigated using nuclear resonance reactions with narrow natural widths such as 19F(p, αγ) 16O and 27Al(p, γ) 28Si. The straggling value is determined by best fitting the simulated excitation spectrum of the γ-ray yields to the corresponding experimental one assuming a Gaussian energy-loss distribution. Thus the energy and Z 2 dependence of energy straggling is studied systematically for 20 monatomic and 4 compound targets. The results are compared with theoretical predictions proposed so far. Furthermore, the additivity rule on energy straggling for compound materials is also discussed.
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