  The experimental evidence that \theta_{13} is large opens new opportunities
to identify the neutrino mass spectrum. We outline a possibility to investigate
this issue by means of conventional technology. The ideal setup turns out to be
long baseline experiment: the muon neutrino beam, with 10^{20} protons on
target, has an average energy of 6 (8) GeV; the neutrinos, after propagating
6000 (8000) km, are observed by a muon detector of 1 Mton and with a muon
energy threshold of 2 GeV. The expected number of muon events is about 1000,
and the difference between the two neutrino spectra is sizeable, about 30%.
This allows the identification of the mass spectrum just counting muon tracks.
The signal events are well characterized experimentally by their time and
direction of arrival, and 2/3 of them are in a region with little atmospheric
neutrino background, namely, between 4 GeV and 10 GeV. The distances from CERN
to Baikal Lake and from Fermilab to KM3NET, or ANTARES, fit in the ideal range.
