Model analysis of time-reversal symmetry test in the 57Fe gamma -transition experiment.

Abstract

The CALTECH \ensuremath{\gamma}-transition experiment testing time-reversal symmetry via the E2/M1 multipole mixing ratio of the 122-keV \ensuremath{\gamma} line in $^{57}\mathrm{Fe}$ has already been performed in 1977. Extending an earlier analysis in terms of an effective one-body potential, this experiment is now analyzed in terms of effective one-boson-exchange T-odd P-even nucleon-nucleon potentials. Within the model space considered for the $^{57}\mathrm{Fe}$ nucleus no contribution from isovector \ensuremath{\rho}-type exchange is possible. The bound on the coupling strength ${\mathrm{\ensuremath{\varphi}}}_{\mathit{A}}$ from effective short-range axial-vector-type exchange induced by the experimental bound on sin\ensuremath{\eta} leads to ${\mathrm{\ensuremath{\varphi}}}_{\mathit{A}}$\ensuremath{\le}${10}^{\mathrm{\ensuremath{-}}2}$.