- #1

- 12

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0.37cm for water and

2.2cm for heavy water

The transport cross sections are listed as 0.45cm for water and 2.6cm for heavy water. Does anyone know how to calculate these from the thermal scattering cross sections?

Thanks!

- Thread starter Kritmiss
- Start date

- #1

- 12

- 0

0.37cm for water and

2.2cm for heavy water

The transport cross sections are listed as 0.45cm for water and 2.6cm for heavy water. Does anyone know how to calculate these from the thermal scattering cross sections?

Thanks!

- #2

- 34

- 2

or generally

macroscopic cross section=1/mean free path

for water 1-cos(theta)=0.324 and 0.116 for heavy water

- #3

- 12

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If I use them, I obtain very different values of transport cross section than those in my book. These values of 1-cos(theta) give 1.14cm for water and 19.16cm for heavy water?

- #4

- 34

- 2

http://mragheb.com/NPRE 402 ME 405 Nuclear Power Engineering/Neutron Diffusion Theory.pdf

- #5

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However, I am still unable to arrive at the values for the transport mean free paths which were stated in my book on nuclear reactions, and I do not understand where your values come from.

Thanks again for trying to help

- #6

- 1

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Its not right to use theta in thermal energy because in thermal area of energy scattering is isotropic!

or generally

macroscopic cross section=1/mean free path

for water 1-cos(theta)=0.324 and 0.116 for heavy water

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