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 


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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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