Understanding UCN production in solid D-2: The generalized density of states measured via inelastic neutron scattering

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Gutsmiedl E, Frei A, Müller AR, Paul S, Urban M, Schober H, Morkel C, Unruh T
Zeitschrift: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Verlag: ELSEVIER SCIENCE BV
Jahr der Veröffentlichung: 2009
Band: 611
Heftnummer: 2-3
Seitenbereich: 256-258
ISSN: 0168-9002


Abstract


The dynamics of solid deuterium [H. Nielsen, et all., Phys. Rev. B 7 (1973) 1626] (sD(2)) is studied by means of inelastic thermal neutron scattering (coherent and incoherent scattering) at different temperatures and para-ortho ratios. In this paper, the results for the generalized density of states (GDOS) are presented and discussed. The measurements were performed at the thermal time-of-flight (TOF) instrument IN4 at the ILL Grenoble, and at the cold neutron TOF instrument TofTof at the FIRM II. The GDOS contains beside the hcp phonon excitations of the sD(2) the rotational transition J = 0 -> 1 and 1 -> 2. The measured and expected intensities of these rotational excitations are strongly depended on the ortho concentration in the sD(2). Above E = 10meV there are still strong excitations, which are very likely smeared out higher energy optic phonons and multiphonon contributions. An empirical method of separation of the one- and multiphonon contributions to the GDOS will be presented and discussed. The impact of these measurements on the UCN production in sD(2) will be shown in detail. (C) 2009 Elsevier B.V. All rights reserved.



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)


Zitierweisen

APA:
Gutsmiedl, E., Frei, A., Müller, A.R., Paul, S., Urban, M., Schober, H.,... Unruh, T. (2009). Understanding UCN production in solid D-2: The generalized density of states measured via inelastic neutron scattering. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 611(2-3), 256-258. https://dx.doi.org/10.1016/j.nima.2009.07.082

MLA:
Gutsmiedl, Erwin, et al. "Understanding UCN production in solid D-2: The generalized density of states measured via inelastic neutron scattering." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 611.2-3 (2009): 256-258.

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