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Karwasz, G P; Brusa, R S; Pliszka, D
Journal of physics. Conference series, 01/2010, Letnik: 199, Številka: 1Journal Article
We compare the recent values of positron total cross sections in benzene, cyclohexane and aniline by Zecca et al. with our previous measurements Karwasz et al. Acta Phys. Pol. A, 107 (2005) 666 on the same apparatus. An apparent discrepancy disappears if Zecca's data are shifted by +0.2 eV; then their data can be approximated by the modified effective range theory, as well. This observation induced us to compare recent Trento data with other experiments and theories for polar targets, H2O and HCOOH. The evidence points out towards the need of a careful energy calibration in positron experiments.
