ACTA

TO THE MEASUREMENTS OF 3γ/2γ RATIO FOR POSITRON ANNIHILATION IN MATTER USING ANNIHILATION ENERGY SPECTRUM

S.K. Andrukhovich^a, A.V. Berestov^a, N.M. Antovich^b and O.N. Metelitsa^c
^aInstitute of Physics of the Belarusian Academy of Sciences F. Skoriny Avenue 70, 220072 Minsk, Belarus
^bDepartment of Physics, University of Montenegro, Podgorica, 81000, Montenegro
^cInstitute of Nuclear Problems, Belarusian State University Bobruiskaya Str., 11, 220050, Minsk, Belarus

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Processes of the summation of cascade γ-quanta usually neglected, when registering the annihilation energy spectrum for the determination of the three-photon annihilation probability P_3γ of positronium in samples, are studied. The deviations of the actual P_3γ value from that determined without allowance made for the summation processes are 56% and 25% for NaI(Tl) and Ge detectors placed at the distance of 3~ cm from a positron source, respectively.

DOI: 10.12693/APhysPolA.99.315
PACS numbers: 71.60.+z, 78.70.Bj