UCN transport simulation in solid deuterium crystals
نویسندگان
چکیده
منابع مشابه
UCN Production With a Single Crystal of Ortho-Deuterium
The present paper reports on the preliminary experimental results concerning a new concept of ultracold neutron production with a single crystal converter of ortho-deuterium lying in the ground rotational state at the low temperature of about 10 K, which should make it possible to utilize a guided cold neutron beam instead of irradiating the converter material in the inside of high radiation fi...
متن کاملInvestigation of Solid D2 for UCN Sources
Solid deuterium (sD2) will be used for the production of ultra-cold neutrons (UCN) in a new generation of UCN sources. Scattering cross sections of UCN in sD2 determine the source yield but until now have not been investigated. We report first results from transmission and scattering experiments with cold, very cold and ultra-cold neutrons on sD2 along with light transmission and Raman scatteri...
متن کاملAn apparatus to control and monitor the para-D2 concentration in a solid deuterium, superthermal source of ultra-cold neutrons
In a recent investigation of solid D2 as a UCN source[1], it was surmised that the yield of UCN is correlated with the spin states of the deuterium molecules. Subsequently, detailed neutron scattering calculations and measurements of the UCN lifetime in mixtures of paraand ortho-deuterium quantitatively verified this conjecture.[2,3,4,5,6] The work we report here was motivated by our attempt to...
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2014 Measurements of the NMR absorption line shapes have been used to establish the phase diagram for orientational ordering of the J = 1 molecules in solid mixtures of paradeuterium (J = 1) and orthodeuterium (J = 0) for para concentrations 42 X 75 % and temperatures 0.035 T 2.5 K. As in solid hydrogen, we observe three phases : a rotationally disordered phase, a long range orientationally ord...
متن کاملKinetic Transport in Crystals
One of the central challenges in kinetic theory is the derivation of macroscopic evolution equations—describing, for example, the dynamics of an electron gas—from the underlying fundamental microscopic laws of classical or quantum mechanics. An iconic mathematical model in this research area is the Lorentz gas, which describes an ensemble of non-interacting point particles in an infinite array ...
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ژورنال
عنوان ژورنال: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
سال: 2012
ISSN: 0168-9002
DOI: 10.1016/j.nima.2012.01.070