How Do I Interpret MCNP Output Table 140 for Reaction Rates?

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Discussion Overview

The discussion revolves around interpreting the MCNP output file, specifically table 140, which details reaction rates in terms of total collisions and other related metrics. Participants are exploring how to convert these values into meaningful reaction rates, particularly in the context of calculating the breeding ratio of U-233 from thorium.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant expresses difficulty in interpreting table 140 of the MCNP output, noting that it provides values like total collisions and weight lost to capture rather than direct reaction rates.
  • The participant seeks to understand how to derive the breeding ratio of U-233 from thorium using the information from table 140.
  • Another participant mentions they will be taking a course on MCNP in the future, indicating they may be able to assist later.
  • A later post indicates that the original poster received help and considers the problem solved, although details of the solution are not shared.
  • Another participant expresses interest in the resolution of the original question, indicating a shared curiosity about the topic.

Areas of Agreement / Disagreement

There is no consensus on the interpretation of the MCNP output or the method to derive reaction rates from table 140, as the original poster's question remains largely unresolved in the thread.

Contextual Notes

The discussion lacks specific details on the methods used to convert the values from table 140 into reaction rates, and there are no shared definitions or assumptions regarding the calculations involved.

Who May Find This Useful

Individuals interested in MCNP output interpretation, particularly in the context of nuclear reactions and breeding ratios, may find this discussion relevant.

Azael
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Im having some trouble interpreting the MCNP output file, more specificaly table 140 that describes reaction rates.

The problem of course is that the acctual reaction rates isn't written but rather things like total colissions, collions*weight, weight lost to capture etc.

How do I convert for instance the weight lost to capture into a acctual reaction rate?

The information I want to find is the breeding ratio of u-233 from thorium so I want.

[Th-232(n,gamma)-Pa-233(n, absorption)]/U-233(n, absorption).

i.e production rate of u-233 divided by consumption rate of u-233. But I don't have the slighest clue how to figure that out from the table 140 information? I have attached the table.
 

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Can't help you for the moment. At the end of May I will follow a course on MCNP, maybe then I'll be able to help :smile:
 
Fortunaly I got some help so its a solved problem :)

99% of the time spent on my masters thesis so far has only been familiarising myself with different software :( Frustration is starting to run quite high!
 
Dear Azael
Please convey to me what was the answer of your question.
I also want to know.
Best Wishes
 

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