S. Arzumanov et al., Neutron life time value measured by storing ultracold neutrons with detection of inelastically scattered neutrons, PHYS LETT B, 483(1-3), 2000, pp. 15-22
The neutron life time tau(n) was measured by storage of ultracold neutrons
(UCN) in a material bottle covered with Fomblin oil. The inelastically scat
tered neutrons were detected by surrounding neutron counters monitoring the
UCN losses due to upscattering at the bottle walls. Comparing traps with d
ifferent surface to volume ratios the free neutron life time was deduced. C
onsistent results for different bottle temperatures yielded tau(n)[sec] = 8
85.4 +/- 0.9(stat) +/- 0.4(syst). (C) 2000 Elsevier Science B.V. All rights
reserved.