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Three-quanta positron annihilation can be a useful chemical probe. 3γ yields have so far been inferred from subtle changes in the gamma spectra. Peak-valley analysis, a method for quantifying 3γ yields, is susceptible to changes in the gamma spectra due not to three-quanta events but to confounding factors such as photon scatter. Based on FLUKA simulations, this work examines its validity and limitation,...
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