Positron Annihilation in p-Terphenyl Doped with Benzofluorene
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In earlier measurements of momentum distribution of annihilating e^+e^- pairs the intensity of o-Ps component seemed to be much higher than that expected from the lifetime data. In this paper we show that such a deviation disappears if one assumes that the pick-off component of angular correlation of annihilation radiation is narrower by 10% than the component related to free annihilation.
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