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VOLUME 90 (2009) | ISSUE 8 |
PAGE 607
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Monte Carlo simulation of quasi-elastic scattering and above-barrier neutrons in the neutron lifetime experiment MAMBO I
A. P. Serebrov, A. K. Fomin
Petersburg Nuclear Physics Institute RAS, 188300 Gatchina, Leningrad District, Russia
PACS: 13.30.Ce, 14.20.Dh
Abstract
Motivated by the strong disagreement of a recent result for the
neutron lifetime with the previous world average value we report results of a
Monte Carlo simulation of the neutron lifetime experiment MAMBO I, which was
carried out some 20 years ago. In addition to all experimental parameters and
procedures known to us, the analysis included quasi-elastic neutron
scattering on the surface of liquid fomblin oil wall coatings of the UCN
storage vessel, and above-barrier neutrons. The original analysis, leading to
the published result of s, did not take into account these effects.
For an exemplary set of model parameters we find a negative correction of 6.0
seconds, which demonstrates that these hitherto neglected effects may be very
important also in the analysis of other neutron lifetime experiments using
UCN storage vessels with fomblin oil coating close to room temperature.
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