A test for time-reversal invariance in nuclear forces

Test for Time-Reversal Invariance of the Electromagnetic Interaction Using the MÖssbauer Effect inRu99

“…The invariance under T requires that the relative phase angle y between the individual multipole amplitudes of a mixed gamma transition be either 0 or n. A finite value of sincp would be equal to the fraction of T-noninvariant amplitude present. The most sensitive experiments previously reported have employed 0-y 1 -y 2 triple coincidence measurements 3 and y x -y 2 coincidence measurements following polarized-neutron capture, 4 and quote an upper limit for sinc^ of the order of sever-on Electron and Photon Interactions at High Energies, Hamburg, 1965 (Springer-Verlag, Berlin, Germany, 1966), Vol I, p. 71. 5 J. G. Asbury, U. Becker, William K. Bertram, P. Joos, M. Rohde, A. J. S. Smith, C. L. Jordan, and Samuel C. C. Ting, to be published.…”

Tests of Time-Reversal Invariance in the ReactionsMg24+d⇄Mg25+p

“…Comparable limits have been set in experiments involving gamma-gamma correlations from oriented nuclei, 7 and improved experiments are in progress. 8 ' 9 The reciprocity measurements described here involve the inverse (ground state) reactions Mg 24 + d;r Mg 25 +/>, which were chosen primarily for experimental convenience. The study was carried out at the University of Washington tandem accelerator using deuterons of approximately 10 MeV and protons of approximately 15 MeV.…”