definition of liquid hydrogen?

From: REDDELL, BRANDON D. (JSC-EV511) <brandon.d.reddell_at_nasa.gov>
Date: Wed, 2 May 2012 15:02:08 -0500

I am having trouble defining liquid hydrogen. Below is the email exchange from
when this question was brought here before. I tried to create the Material/Compound
cards for the latest version of FLUKA , such as:

*Liquid H2
MATERIAL 1.0 1.00794 0.0000837 3.0 0.0 0.0 HYDRO=
GEN
LOW-MAT HYDROGEN 1. -2. 87. 0.0 0. HYDRO=
GEN
MATERIAL 0.0 0.0 0.07 26.0 0.0 0.0 LH2
COMPOUND 2.0 3.0 0.0 0.0 0.0 0.0 LH2

I am not quite getting the results I thought I would (using PRECISIOn defaults)
and suspect that this is not being defined correctly. Can someone tell me what I am doing wrouid H2
MATERIAL 1.0 1.00794 0.0000837 3.0 0.0 0.0 HYDROGEN
LOW-MAT HYDROGEN 1. -2. 87. 0.0 0. HYDROGEN
MATERIAL 0.0 0.0 0.07 26.0 0.0 0.0 LH2
COMPOUND 2.0 3.0 0.0 0.0 0.0 0.0 LH2

I am not quite getting the results I thought I would (using PRECISIOn defaults)
and suspect that this is not being defined correctly. Can someone tell me what I am doing wrong?

Thanks,

From: Hantao Jing <jinght_at_mail.ihep.ac.cn>
Date: Wed, 17 Dec 2008 10:14:46 +0800

Dear Mr. Fasso',
     As what you said, I run the input file successfully. I am sorry to
waste too much your time. It is my false to employ the data from table
10.6, instead of table 10.3, in fluka manual.
     Thank you very much again!

                                           Best regards,
                                           Hantao jing
                                           2008-12-17

Alberto Fasso' wrote:
> Dear Hantao Jing,
>
> in the first case below, FLUKA does not recognize the material "HYDROGEN"
> because you have given a wrong second numerical identifier. Check in themanual:
> there is only one HYDROGEN at 87K:
> H Free gas natural Hydrogen 87K ENDF/B-VIIR0 Y HYDROGEN 1 -2 87
> (you have input -5. instead of -2.)
>
>>>>>> MATERIAL 1. 1.007947 0.06 28. 0.0 0.HLIQUID
>>>>>> LOW-MAT HLIQUID 1. -5. 87. 0.0 0.HYDROGEN
>>>>>> *** (n,p) proton production activated for Xsec mat. # 1 ***
>>>>>> **** Low energy neutron xsec not found for some media 5 6 ****
>>>>>> HYDROGEN
>>>>>>
>
> In the second case, the third identifier is wrong. In the new library,
> room temperature is 296 K, not 293.
> There are 3 HYDROGEN at 296K:
>
> H H2O bound natural Hydrogen 296K ENDF/B-VIIR0 Y HYDROGEN 1 -2 296
> H CH2 bound natural Hydrogen 296K ENDF/B-VIIR0 Y HYDROGEN 1 -3 296
> H Free gas natural Hydrogen 296K ENDF/B-VIIR0 Y HYDROGEN 1 -5 296
>
>>>>>> MATERIAL 1. 1.007947 0.06 28. 0.0 0.HLIQUID
>>>>>> LOW-MAT HLIQUID 1. -2. 293. 0.0 0.HYDROGEN
>>>>>> *** (n,p) proton production activated for Xsec mat. # 1 ***
>>>>>> **** Low energy neutron xsec not found for some media 5 6 ****
>>>>>> HYDROGEN
>
> Best regards,
>
> Alberto
>
> On Tue, 16 Dec 2008, Hantao Jing wrote:
>
>> Dear Mr. Fasso',
>> In fact, before I define the HLIQUID, I have defined water and air
>> material(this input file for fluka courses is obtained from the fluka
>> site,the water and air material has been defined before), namely, they will
>> be assigned the material number 26 and 27. So the material HLIQUID will
>> assigned the number 28. On the other hand, I also leave the material number
>> blank and run this input file, I got the same error. So I believe that it is
>> not wrong with material number. Can you to check it again?
>> Thank you very much!
>>
>> Best regards,
>> Hantao Jing
>> 2008-12-16
>
>
>
>
Received on Thu May 03 2012 - 11:40:20 CEST

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