Test of time reversal invariance in 2-MeV neutron scattering from aligned165Ho |
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| Authors: | J. E. Koster E. D. Davis C. R. Gould D. G. Haase N. R. Roberson L. W. Seagondollar |
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| Affiliation: | (1) Triangle Universities Nuclear Laboratory, 27706 Durham, NC, USA;(2) North Carolina State University, 27695 Raleigh, NC, USA;(3) Duke University, 27706 Durham, NC, USA;(4) University of Arizona, 85721 Tucson, AZ, USA;(5) Los Alamos National Lab, 87545 Los Alamos, NM |
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| Abstract: | 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. |
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