  The past two decades have yielded several new measurements and reanalyses of
older measurements of the neutron lifetime. These have led to a 4.4 standard
deviation discrepancy between the most precise measurements of the neutron
decay rate producing protons in cold neutron beams and the lifetime measured in
neutron storage experiments. Measurements using different techniques are
important for investigating whether there are unidentified systematic effects
in any of the measurements. In this paper we report a new measurement using the
Los Alamos asymmetric magneto-gravitational trap where the surviving neutrons
are counted external to the trap using the fill and dump method. The new
measurement gives a free neutron lifetime of . Although this measurement is not
as precise, it is in statistical agreement with previous results using in situ
counting in the same apparatus.
