"m=1" coatings for neutron guides

C.P. Cooper-Jensen, A. Vorobiev, Esben Bryndt Klinkby, V. Kapaklis, H. Wilkens, D. Rats, B. Hjörvarsson, O. Kirstein, Philip Bentley

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    Abstract

    A substantial part of the price for a neutron guide is the shielding needed because of the gamma ray produced when neutrons are absorbed. This absorption occurs in the coating and the substrate of the neutron guides. Traditional m=1 coatings have been made of Ni and if reflectivity over the critical angle of Ni is needed one has used Ni58 or Ni/Ti multilayer coatings. Ni has one of the highest neutron scattering density but it also has a fairly high absorption cross section for cold and thermal neutrons and when a neutron is absorbed it emits a lot of gamma rays, some with energies above 9 MeV. Materials like diamond and Be have higher neutron scattering density than Ni, have smaller absorption cross section and when a neutron is absorbed they emit much less gamma ray and at lower energies. We present results, both theoretically and experimentally, comparing Ni with Be and preliminary results of diamond coatings to show the potential for using these coatings in neutron guides.
    Original languageEnglish
    Article number012005
    Book seriesJournal of Physics: Conference Series (Online)
    Volume528
    Number of pages8
    ISSN1742-6596
    DOIs
    Publication statusPublished - 2014
    EventInternational Workshop on Neutron Optics and Detectors - Commundo Tagungshotel, Ismaning, Germany
    Duration: 2 Jul 20135 Jul 2013

    Conference

    ConferenceInternational Workshop on Neutron Optics and Detectors
    LocationCommundo Tagungshotel
    Country/TerritoryGermany
    CityIsmaning
    Period02/07/201305/07/2013

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