  The author considers a hypothesis of neutron lifetime splitting in beta-decay
and shows that the beta-decay of neutrons could be described by the triad of
lifetimes tau_{Left}, tau_{Mean}, tau_{Right}. The lifetime tau_{Left} is the
lifetime of L-neutrons emitting electrons against the neutron spin direction
(L-type neutron decay). The lifetime tau_{Right} is the lifetime of R-neutrons
emitting electrons in the direction of the neutron spin (R-type neutron decay).
The lifetime tau_{Mean} is the arithmetic average of tau_{Left}, tau_{Right} or
the mean neutron lifetime. While using the parameters of electron-spin
asymmetry of neutron decay and the results for determining the mean neutron
lifetime, the performed numerical estimates gave the numerical values of the
triad tau_{Left}, tau_{Mean}, tau_{Right} as 813 s, 900 s and 987 s
respectively. In addition to the estimates, the lifetimes of the triad are
determined from experimental data applying the decay scale tuning method
proposed by the author. The experimental values of the triad coincided with the
estimates with high accuracy. The weighted average neutron lifetime tau_{W}
determined from the experimental neutron lifetimes tau_{Left} and tau_{Right}
is equal to tau_{W}=833.33 +- 0.02 s, and is in good agreement with the values
of the neutron lifetime obtained by the other methods.
