Surface roughness effect on ultracold neutron interaction with a wall and implications for computer simulations

Details Surface roughness effect on ultracold neutron interaction with a wall and implications for computer simulations Surface roughness effect on ultracold neutron interaction with a wall and implications for computer simulations

2009-11-20

arxiv.org/abs/0911.4115v2

Phys.Rev.C81:055505,2010; Erratum-ibid.C82:059905,2010

Physics

Condensed Matter

Other Condensed Matter

39 pages, 9 figures; additional calculations included

Scientific paper

10.1103/PhysRevC.81.055505 10.11

We review the diffuse scattering and the loss coefficient in ultracold neutron reflection from slightly rough surfaces, report a surprising reduction in loss coefficient due to roughness, and discuss the possibility of transition from quantum treatment to ray optics. The results are used in a computer simulation of neutron storage in a recent neutron lifetime experiment that re-ported a large discrepancy of neutron lifetime with the current particle data value. Our partial re-analysis suggests the possibility of systematic effects that were not included in this publication.

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