Instruments and Experimental Techniques

, Volume 43, Issue 4, pp 453–459 | Cite as

A spectrometer for the study of angular correlations in polarized-orthopositronium decay

  • S. K. Andrukhovich
  • N. Antovich
  • A. V. Berestov
Nuclear Experimental Techniques


We describe a setup for experimental testing of the CPT-invariance by observing the angular correlations in the decay of polarized orthopositronium atoms. Annihilation events are detected by five NaI(T1) sensors of 150-mm diameter and 100-mm thickness, located at the vertices of a regular pentagon. The sensor signals are detected in the double-coincidence circuits gated by signals with different time delays from the positron escape. The setup has a time resolution of 8.0 ns. In order to reduce the effect of the long-term instability and the instrumental asymmetry on the experimental results, the direction of positron incidence on a SiO2 target was reversed with a program-driven period during data acquisition. The value of the asymmetry, measured with due account of statistical and systematic errors, is 0.0008±0.00091, which is twice better as compared with the previous experiment.


Count Rate Angular Correlation Background Count Rate Gate Signal Positron Source 
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Copyright information

© MAIK “Nauka/Interperiodica” 2000

Authors and Affiliations

  • S. K. Andrukhovich
    • 1
  • N. Antovich
    • 2
  • A. V. Berestov
    • 1
  1. 1.Stepanov Institute of PhysicsBelarussian Academy of SciencesMinskBelarus
  2. 2.Department of PhysicsUniversity of MontenegroMontenegro

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