Date: Tue, 26 Jul 2016 07:04:53 +0000
Dear Roman,
In FLUKA, neutron cross section tabulations are only available for certain temperatures (they derive from ENDF/B-VII.0). For unbound hydrogen, tabulations exist for 4K, 87K, 296K and 430K (see manual, Section 10.4.1.2). As you can see in the manual, the tabulations are indeed not for liquid hydrogen. The two lower temperatures are however closest to the temperature where you have the liquid phase. Hence the material definition discussed in the previous thread used the 4K tabulations.
Cheers, Anton
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From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Roman Savinov [rsavinov_at_calpoly.edu]
Sent: 21 July 2016 09:41
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: Liquid Hydrogen at what temperature
Dear Fluka experts,
I followed this thread to set up the input for liquid hydrogen: http://www.fluka.org/web_archive/earchive/new-fluka-discuss/4656.html
* Liquid H
MATERIAL 1.0 1.00794 0.07 LH
LOW-MAT LH2 1. -5. 4. HYDROGEN
As you can see from the choice of numerical identifiers in LOW-MAT, the hydrogen is chosen at T=4 K.
I'm just not sure if 4K is a right choice for liquid hydrogen because according to this phase diagram:
[cid:a2c8ef00-e085-430e-b87f-e4df486aeff4]
(form here https://www.researchgate.net/publication/8618603), liquid state can exist neither at 4 K nor at 87K.
Thank you,
Roman
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