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The analysis of experiments on measuring neutron lifetime has been made. Thelatest most accurate result of measuring neutron lifetime [Phys. Lett. B 605,72 (2005)] 878.5 \pm 0.8 s differs from the world average value [Phys. Lett. B667, 1 (2008)] 885.7 \pm 0.8 s by 6.5 standard deviations. In view of this boththe analysis and the Monte Carlo simulation of experiments [Phys. Lett. B 483,15 (2000)] and [Phys. Rev. Lett. 63, 593 (1989)] have been performed.Systematic errors about -6 s have been found in both experiments. The table ofresults of neutron lifetime measurements is given after corrections andadditions have been made. A new world average value of neutron lifetime makesup 880.0 \pm 0.9 s. Here is also presented a separate analysis of experimentson measuring neutron lifetime with UCN and experiments on the beams. Theaverage neutron lifetime for experiments with UCN is equal to 879.3(0.6) s,while for experiments on the beams it is equal to 889.1(2.9) s. The presentdifference of average values for both groups is (3.3 sigma) and needsconsideration. The contribution of beam experiments into the world averagevalue is not high, therefore it does not influence the above analysis. However,it is an independent problem to be solved. It seems desirable that theprecision of beam experiments should be enhanced.

New evaluation of neutron lifetime from UCN storage experiments and beam experiments