Measurement of the energy dependence of the neutron loss per bounce function on reflection from oil and grease surfaces using monochromatic ultracold neutrons


Richardson, D.J., Pendlebury, J.M., Iaydjiev, P., Mampe, W., Green, K. and Kilvington, A.I. (1991) Measurement of the energy dependence of the neutron loss per bounce function on reflection from oil and grease surfaces using monochromatic ultracold neutrons Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 308, (3), pp. 568-573. (doi:10.1016/0168-9002(91)90069-3).

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Description/Abstract

We report a technique for determining directly the energy dependent UCN loss per bounce function _µ_(E) for material surfaces using monochromatic UVN. Results of such measurements on Fomblin oil and grease surfaces are presented for neutrons with energies in the range 5 to 106 neV, in the temperature range 283-308 K. The results show that these materials exhibit a loss per bounce function in good agreement with that predicted by the theory of UCN scattering from an abrupt one dimensional complex potential step. Some evidence for very small energy changes at reflection was found for neutrons with energies close to the critical energy of the step. Values of the loss parameter (2f) = 4.7(0.2) and 3.7(0.2) x 10^-5 (at 294 K) were deduced for the oil and grease surfaces respectively. The (2f) parameter of the oil was found to be strongly temperature dependent.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/0168-9002(91)90069-3
ISSNs: 0168-9002 (print)
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ePrint ID: 78352
Date :
Date Event
20 October 1991Published
Date Deposited: 11 Mar 2010
Last Modified: 18 Apr 2017 20:23
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/78352

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