Abstract
If all nuclei from a reaction recoil from a thin target at essentially the same velocity, it is easy to correct for the variation of γ-ray energy with emission angle due to the Doppler shift to combine data from different detectors and improve the statistical accuracy. However, the situation is more complex with thick-target experiments in which γ emission occurs over a wide range of velocities. Now charged-particle detector arrays allow the determination of the exact recoil angle and velocity from fusion-evaporation reactions on an event-by-event basis. Corrections for the variations in the Doppler shift due to different angles between each detector and each recoil event and for the variations in the recoil velocities would provide better statistical accuracy and more accurate line shapes for analysis using the Doppler-shift attenuation method to infer mean lifetimes of excited states. A technique to make these corrections has been developed using simulated line shapes.
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