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Temperature dependent positron annihilation lifetime spectroscopy (PALS) measurements in the range of 50-300 K are carried out to study positronium formation in 40 keV B + -ion implanted polymethylmethacrylate (B:PMMA) with two ion doses of 3.13·10 15 and 3.75·10 16 ions/cm 2 . The investigated samples show the various temperature trends of ortho-positronium (o-Ps) lifetime τ 3 and intensity I 3 in PMMA before and after ion implantation. Two transitions in the vicinity of ∼150 and ∼250 K,doi:10.1063/1.4892646 fatcat:uennjd7e3bd7hnv23elvd4256e