CPandTviolation in long baseline experiments with low energy neutrinos from a muon storage ring

Stimulated by the idea of PRISM, a very high intensity muon ring with a rather low energy, we consider the possibility of observing $\mathrm{CP}$-violation effects in neutrino oscillation experiments. More than 10% of $\mathrm{CP}$-violation effects can be seen within the experimentally allowed region. The destructive sum of the matter effect and $\mathrm{CP}$-violation effect can be avoided with the use of an initial ${\nu }_{\mathrm{}\mathrm{e}}$ beam. We finally show that the experiment with (a few) $\times 100$ MeV of neutrino energy and (a few) $\times 100$ km of baseline length, which is considered in this paper, is particularly suitable for the search for $\mathrm{CP}$ violation in view of the statistical error.