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

Abstract

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.

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References

  1. 1.
    Barmin, V.V., Barylov, V.G., Chuvilo, I.V.,et al., Nucl. Phys., 1984, vol. 247, p. 293.CrossRefADSGoogle Scholar
  2. 2.
    Arbic, B.K., Hatamian, S., Skalsey, M.,et al., Phys. Rev. A, 1988, vol. 37, p. 3189.CrossRefADSGoogle Scholar
  3. 3.
    Gol'danskii, V.I.,Fizicheskaya khimiya pozitrona i pozitroniya (Physical Chemistry of Positron and Positronium), Moscow: Nauka, 1968.Google Scholar
  4. 4.
    Berestov, A.V. and Zyazyulya, F.E.,Prib. Tekh. Eksp., 1983, no. 5, p. 47.Google Scholar
  5. 5.
    Aleksandrov, A.A., Mokrousov, V.A., and Pyatkov, Yu.V.,Prib. Tekh. Eksp., 1982, no. 4, p. 122.Google Scholar
  6. 6.
    Abdurasulev, Z.R., Arifov, P.U., Arutyunov, N.Yu.,et al., Metody pozitronnoi diagnostiki i rasshifrovki spektrov annigilyatsii pozitronov (Methods of Positron Diagnostics and Identification of Positron Annihilation Spectra), Tashkent: Izd. FAN, 1985.Google Scholar
  7. 7.
    Baryshevsky, V.G., Metelitsa, O.N., Tikhomirov, V.V.,et al., Phys. Lett. A, 1989, vol. 136, p. 428.CrossRefADSGoogle Scholar
  8. 8.
    Brandt, W. and Dupasquier, A.,Positron Solid-State Physics, Amsterdam: North-Holland, 1983.Google Scholar

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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