The method of measuring the neutron beta-decay lifetime tau(beta) by storag
e of ultra-cold neutrons (UCN) with simultaneous recording of inelastically
scattered neutrons is presented. The result of the measurement is tau(beta
) [s] = 885.4 +/- 0.9(stat) +/- 0.4(syst). (C) 2000 Elsevier Science B.V. A
ll rights reserved.