Understanding Neutron Scattering from Nuclei: Questions and Answers

In summary, the conversation discusses a cross section for neutron scattering from a nucleus with three resonant peaks corresponding to three different resonant particles. The lifetimes of the particles can be calculated using h-bar divided by the width. The cross section is more complicated than that of lower mass nuclei, and it may be difficult to find experimental values for these resonances at energies in MeV. In addition to peak positions, decay widths, and cross sections, there may be other information that can be determined from the graph. The equation for the total scattering cross section is also provided.
  • #1
ryanwilk
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Homework Statement



I have a (numerically calculated) cross section for a neutron scattering from a nucleus which looks like:

SW-U-50l9.png


1) Am I correct in saying that there are three resonant peaks and these correspond to three different resonant particles?

2) If so, are the lifetimes of the particles just h-bar divided by the width?

3) Why is this cross section more complicated than neutron scattering from lower mass nuclei?

4) I was unable to find any experimental values for these resonances. Is this because I'm looking at energies in MeV, which is difficult to do experimentally?

5) Other than peak positions, decay widths and cross sections, can anything else be determined from this graph?

Homework Equations



The total scattering cross section is:

[tex] \sigma = \frac{4 \pi}{k^2} \sum_{l=0}^{\infty} (2l+1) ~\mathrm{sin}^2 \delta_l\>.[/tex].

The Attempt at a Solution



(Given in 1)

Answers to any of the questions would be greatly appreciated!

Thank you.
 
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  • #2
Anyone? :frown:
 

FAQ: Understanding Neutron Scattering from Nuclei: Questions and Answers

1. What is neutron scattering and how does it work?

Neutron scattering is a technique used in materials science and physics to study the structure and dynamics of materials at the atomic and molecular level. It involves directing a beam of neutrons at a sample and analyzing the scattered neutrons to gather information about the sample's properties.

2. What are the advantages of using neutron scattering compared to other techniques?

Neutron scattering has several advantages over other techniques, such as X-ray diffraction and electron microscopy. Neutrons are sensitive to light elements and magnetic materials, making them ideal for studying biological and magnetic materials. Neutrons also have a lower energy than other probes, which reduces the damage to samples and allows for in situ studies.

3. What types of information can be obtained from neutron scattering experiments?

Neutron scattering can provide information about the atomic and molecular structure, dynamics, and magnetic properties of materials. This includes the position and arrangement of atoms, the movement of atoms and molecules, and the magnetic structure and properties of materials.

4. What types of materials are suitable for neutron scattering experiments?

Neutron scattering can be used to study a wide range of materials, including liquids, gases, crystals, polymers, and biological materials. However, the material must have a high enough neutron scattering cross section to produce a measurable signal.

5. How is neutron scattering used in real-world applications?

Neutron scattering has a wide range of applications in various fields, including materials science, chemistry, biology, and engineering. It is used to study the structure and properties of materials for developing new materials and improving existing ones. It is also used in the development of new drugs and understanding biological processes, as well as in the study of nuclear reactors and other energy-related technologies.

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