Understanding of ultra-cold-neutron production in solid deuterium

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Autor(en): Frei A, Gutsmiedl E, Morkel C, Müller AR, Paul S, Rols S, Schober H, Unruh T
Zeitschrift: EPL - Europhysics Letters
Jahr der Veröffentlichung: 2010
Band: 92
Heftnummer: 6
ISSN: 0295-5075


Our recent neutron scattering measurements of phonons and other quasi-particle excitations in solid deuterium (sD(2)) and the extraction of the density of states for phonons and rotational transitions in sD(2) have led us to a new understanding of the production of ultra-cold neutrons (UCN) in sD(2)(.) The UCN production rate reaches a maximum at an equivalent neutron temperature of T(n) = 40K for a neutron flux with Maxwellian energy distribution. The cross-section for UCN production in sD(2) has been determined by using the density of states G(1)(E) in combination with the incoherent approximation as well as by a direct calibration of our measured neutron cross-sections with the known cross-section of the J = 1 -> 0 rotational transition in deuterium. Using this cross-section we deduced the production rate of UCN in sD(2) which agrees quite well with direct measurements of this energy averaged UCN production cross-section. Copyright (C) EPLA, 2010

FAU-Autoren / FAU-Herausgeber

Unruh, Tobias Prof. Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)

Autor(en) der externen Einrichtung(en)
Institute Laue-Langevin (ILL)
Technische Universität München (TUM)


Frei, A., Gutsmiedl, E., Morkel, C., Müller, A.R., Paul, S., Rols, S.,... Unruh, T. (2010). Understanding of ultra-cold-neutron production in solid deuterium. EPL - Europhysics Letters, 92(6). https://dx.doi.org/10.1209/0295-5075/92/62001

Frei, Andreas, et al. "Understanding of ultra-cold-neutron production in solid deuterium." EPL - Europhysics Letters 92.6 (2010).


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