What does the number 0.62 in MCNP refer to?

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The number 0.62 refers to the lwtr.62t library, which is a S(a,b) library for Hydrogen in Light Water from the ENDF/B 6.3 dataset. This library is associated with a temperature of 500 K, although older references may indicate 600 K. Users are advised to consult "Appendix G" of the MCNP manual relevant to their code version for accurate material and temperature listings. The discussion highlights the importance of using updated versions of the library, such as ENDF/B 7 or 8, for better accuracy. Accurate documentation is essential for proper data interpretation in nuclear simulations.
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What does the number 0.62 refer to?
Does it the water density at high temperature?
 

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Hi,
it is the name of the library,
lwtr.62t is a S(a,b) library for Hydrogen in Light Water :
endf 6.3 ; 500 K
 
To find a list of materials and temperatures, you need to look in "Appendix G" of the MCNP manual for the version of the code you are using.

I don't know what version of the code you are using, but lwtr.62t is from ENDF/B 6.3 (1993).
This is pretty old, I would use version 7 or possibly 8.

Looking at an older version of "Appendix G", lwtr.62t refers to 600 K
https://mcnp.lanl.gov/pdf_files/la-ur-03-1987g_sab.pdf

Looking at the version of Appendix G distributed with my version (LA-UR-17-20709), lwtr.62 refers to 500 K.

You need to look at the documentation distributed with your library.
 

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