What does the number 0.62 in MCNP refer to?

[Aly_19f]

What does the number 0.62 refer to?
Does it the water density at high temperature?

 

[PSRB191921]

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

 

[rpp]

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.

 

[PSRB191921]

Looking to Conlin, Jeremy Lloyd. Listing of Available ACE Data Tables. United States: N. p., 2017.
https://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-17-20709
lwtr.62t refers to 500 K not 600 K

strange ...