Hyperfine Interactions

, Volume 75, Issue 1–4, pp 165–172 | Cite as

Test of time reversal invariance in 2-MeV neutron scattering from aligned165Ho

  • J. E. Koster
  • E. D. Davis
  • C. R. Gould
  • D. G. Haase
  • N. R. Roberson
  • L. W. Seagondollar
Parity and Time Reversal Tests


We describe a search for the time reversal non-invariant five-fold correlation (s·Ixk)(I·k) in the scattering of 2 MeV polarized neutrons from an aligned165Ho target. Here s is the neutron spin,I is the target spin, andk is the neutron momentum vector. Differences in transmission were sought when s was reversed. The target was a single crystal of holmium, cryogenically aligned with a specially built dilution refrigerator. Rotating the target axis of alignment while cold permits the parity-even, five-fold correlation to be identified among other spin-dependent correlations in the forward elastic scattering amplitude. An analyzing power was found to be (1±6)×10−4, consistent with time reversal invariance.We obtain a bound of 5×10−3 for αT, the ratio of T-odd to T-even couplings in the effective nucleon-nucleon interaction.


Thin Film Analyze Power Holmium Momentum Vector Dilution Refrigerator 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. /1/.
    J.W. Cronin, Rev. Mod. Phys.53 (1981) 373.CrossRefADSGoogle Scholar
  2. /2/.
    J.D. Bowman et al., in “Fundamental Symmetries in Nuclei and Particles”, H. Hendrikson and P. Vogel, eds. (World Scientific, 1990) p. 1.Google Scholar
  3. /3/.
    V.G. Baryshevskii, Sov. J. Nucl. Phys.38 (1983) 699.Google Scholar
  4. /4/.
    A.L. Barabanov, Sov. J. Nucl. Phys.44 (1986) 755.Google Scholar
  5. /5/.
    P.K. Kabir, in “The Investigation of Fundamental Interactions with Cold Neutrons”, G.L. Greene, ed. (NBS Special Publication711, 1986) p. 81.Google Scholar
  6. /6/.
    V.E. Bunakov, Phys. Rev. Lett.60 (1988) 2250.CrossRefADSGoogle Scholar
  7. /7/.
    E.D. Davis et al., to be published.Google Scholar
  8. /8/.
    V.P. Gudkov, Z. Phys.A337 (1990) 247.Google Scholar
  9. /9/.
    V.P. Gudkov, Nucl. Phys.A524 (1991) 668.CrossRefADSGoogle Scholar
  10. /10/.
    P. Herczeg, Hyperfine Interactions43 (1988) 77.Google Scholar
  11. /11/.
    E.M. Henley, in “Weak and Electromagnetic Interactions in Nuclei”, P. Depommier, ed. (Editions Frontieres, 1989) p. 181.Google Scholar
  12. /12/.
    W.C. Haxton, Bull. Am. Phys. Soc.36 (1991) 2138.Google Scholar
  13. /13/.
    J.E. Koster, E.D. Davis, C.R. Gould, D.G. Haase, N.R. Roberson, L.W. Seagondollar, S. Wilburn, and X. Zhu, Phys. Lett.B267 (1991) 23.CrossRefADSGoogle Scholar
  14. /14/.
    E.M. Henley and Paul Huffman, Phys. Rev. Lett.21 (1968) 1191.CrossRefADSGoogle Scholar
  15. /15/.
    P.A. Moldauer, Phys. Lett.26B (1968) 713.ADSGoogle Scholar
  16. /16/.
    W. Tornow, R.C. Byrd, P.W. Lisowski, R.L. Walter, and T.R. Donoghue, Nucl. Phys.A371 (1981) 235.CrossRefADSGoogle Scholar
  17. /17/.
    L. Stodolsky, Phys. Lett.B172 (1986) 5.CrossRefADSGoogle Scholar
  18. /18/.
    P.K. Kabir, Phys. Rev.D37 (1988) 1856.CrossRefADSGoogle Scholar
  19. /19/.
    J.P. Soderstrum, C.R. Gould, D.G. Haase, L.W. Seagondollar, M.B. Schneider, and N.R. Roberson, Phys. Rev.C38 (1988) 2424.CrossRefADSGoogle Scholar
  20. /20/.
    T.B. Clegg, in AIP Conference Proceedings Vol. 187, K.J. Heller, ed. (1989) p. 1227.Google Scholar
  21. /21/.
    J.E. Koster, PhD thesis 1990, unpublished.Google Scholar
  22. /22/.
    J.E. Koster, C.R. Gould, D.G. Haase, and N.R. Roberson, to be published in Nucl. Instr. and Meth.Google Scholar
  23. /23/.
    D.L. Strandberg, S. Legvold, and F.H. Spedding, Phys. Rev.127 (1962) 2046.CrossRefADSGoogle Scholar
  24. /24/.
    M. Krusius, A.C. Anderson, and B. Holström, Phys. Rev.177 (1969) 910.CrossRefADSGoogle Scholar
  25. /25/.
    D.G. Haase et al., to be published.Google Scholar
  26. /26/.
    J.E. Koster, C.R. Gould, D.G. Haase, and N.R. Roberson, PhysicaB165 (1990) 153.CrossRefADSGoogle Scholar
  27. /27/.
    J.E. Koster, C.R. Gould, D.G. Haase, N.R. Roberson, S. Wilburn, and X.Zhu, to be published.Google Scholar
  28. /28/.
    J. Meadows, A. Smith, J. Whalen, and T.D. Beynon, Z. Phys.243 (1971) 171.CrossRefGoogle Scholar
  29. /29/.
    J.B. French, A. Pandey, and J. Smith, in “Tests of Time Reversal Invariance in Neutron Physics”, N.R. Roberson, C.R. Gould, and J.D. Bowman, eds. (World Scientific, 1987) p. 80.Google Scholar
  30. /30/.
    H.L. Harney, A. Hüpper, and A. Richter, Nucl. Phys.A518 (1990) 35.CrossRefADSGoogle Scholar

Copyright information

© J.C. Baltzer A.G., Scientific Publishing Company 1992

Authors and Affiliations

  • J. E. Koster
    • 2
    • 1
  • E. D. Davis
    • 4
  • C. R. Gould
    • 2
    • 1
  • D. G. Haase
    • 2
    • 1
  • N. R. Roberson
    • 3
    • 1
  • L. W. Seagondollar
    • 2
    • 1
  1. 1.Triangle Universities Nuclear LaboratoryDurhamUSA
  2. 2.North Carolina State UniversityRaleighUSA
  3. 3.Duke UniversityDurhamUSA
  4. 4.University of ArizonaTucsonUSA

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