  We show that a detector placed near a beta-beam storage ring can probe lepton
number violating interactions, as predicted by supersymmetric theories with
R-parity non-conservation. In the presence of such interactions, nu_tau can be
produced during beta-decay leading to tau leptons through weak interactions.
Alternatively, electron neutrinos from beta-decay of radioactive ions can
produce tau leptons in a nearby detector through these interactions. The muons
from the decay of these tau leptons can be readily identified in a small iron
calorimeter detector and will signal violation of R-parity.
