Influence of doppler effect on the shape of γ-ray peaks in PIGE

Particle induced γ-ray emission (PIGE) is an important ion beam analysis (IBA) technique for the determination of elements, those with Z ≤ 17 in particular, in materials. It is based on high resolution spectroscopy of prompt γ-rays emitted from protons / α particles / heavy ion beams induced nuclear reactions. Several nuclear reactions involving different elements / isotopes can occur simultaneously. As a result the prompt γ-ray spectra often contain multiple peaks. A comprehensive spectral analysis is therefore desirable to realise the simultaneous multi-elemental detection capability of PIGE technique. The prompt γ-rays are generally produced from the de-excitation of recoiling nuclei formed in the nuclear reactions. The shape of the γ-ray peaks is influenced by energy of the recoiling nuclei and the life time of their excited states