The decay of the K+ meson stopped in the nuclear photoemulsion according to the scheme: K+ -> n+ + n0 was followed by the decay of the n0 - meson according to the scheme n0 -> g + e+ + e-, and the vertex of the e + e- pair was at a distance l = 0 .1 µm from the stopping point of the K+ - meson. Estimate the lifetime m0 of the n0 - meson if it is known that the rest energy of the K+ - meson MKc2 = 494 MeV, the rest energy of the n+ - meson Mn+c2 = 140 MeV and the rest energy of the n0 - meson Mn0c2 = 135 MeV.

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