Answered: a) The ILL powder diffractometer uses…

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter14: Nuclear Physics Applications

Section: Chapter Questions

Problem 15P

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a) The ILL powder diffractometer uses the pyrolytic graphite (002) Bragg reflection to monochromatize the incident neutron beam from the “white” spectrum of the reactor, what is the ki of the neutron beam? What is the Ei in unit of meV? The lattice parameter c = 6.71 Å for pyrolytic graphite (PG).
b) When the Ge (311) monochromator is switched in, what is the ki and what is the Ei? Germanium crystalizes in a cubic structure of the lattice parameter a = 5.66 Å.
c) Silicone also crystalizes in a cubic structure of lattice parameter a = 5.43 Å, which of its
Bragg peaks of the type (311), (622), (933), ... , (3n,n,n) can be measured using a) PG
(002) or b) Ge (311) monochromator?

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