Bragg Scattering - Need help because it is hard for me.

AI Thread Summary
The discussion revolves around a problem involving Bragg scattering of thermal neutrons from a crystal with a specific interplanar spacing of 0.247 nm. The individual is seeking assistance in determining the Bragg scattering angle for neutrons with an energy of 0.0105 eV. The approach involves using the Bragg equation, 2dsin(theta) = n(lambda), and calculating the wavelength of the neutrons via the de Broglie relation. There is also a question about whether other energies will be present in the scattered beam. The discussion highlights the need for clarity in applying these concepts to solve the problem effectively.
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I am really stuck on this problem. This entire section I have been teaching myself using the homework answers but I have no idea where to start. Thanks anyone.

Question:
A beam of thermal neutrons emerges from a nuclear reactor and is incident on a crystal as shown below. The beam is Bragg scattered from a crystal whose scattering planes are separated by 0.247nm. From the continuous energy spectrum of the beam we wish to select neutrons of energy 0.0105eV. Find the Bragg scattering angle that results in a scattered beam of this energy. Will other energies also be present in this scattered beam?
http://qaboard.cramster.com/answer-board/image/373f241a0a260e4f6fd216bbcb88754a.jpg



Homework Statement


d = 0.247 nm
E of neurons 0.0105ev



Homework Equations


http://earth.esa.int/applications/data_util/SARDOCS/_icons/c3_bragg.jpg

http://earth.esa.int/applications/data_util/SARDOCS/_icons/c3_brag_formula.jpg
http://earth.esa.int/applications/data_util/SARDOCS/_icons/c3_brag_formula1.jpg

The Attempt at a Solution



2dsin(tetha) = n(lamda)
from here sin(tetha) comes.
 
Last edited by a moderator:
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Calculate the wave-length of the neutron through the de Broglie-relation. Then use the Bragg condition to identify the angle.
 
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