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Forum: Hadronic Processes
Re: Question Neutron Range (M Sek)
Re: None Re: Neutron Range (michel maire)
Date: 10 Dec, 2017
From: M Sek <M Sek>

On Sat, 09 Dec 2017 17:54:46 GMT, michel maire wrote:
> On Sat, 09 Dec 2017 11:29:23 GMT, M Sek wrote:
> > Distinguished users,
> > 
> > I am trying to obtain the maximum penetrating distance of 0-50 MeV energetic neutrons in a medium. I suppose, it is possible to obtain this as range for charged particles in TestEm0. 
> > 
> > I will be so happy if an experienced friend explains me how to obtain this value of that energetic neutrons with the help of Hadr examples or any other way.
> > 
> > Thanks in advance,
> > Best
> > M. Sek
> > 
>   Hadr03 will give  neutron interaction length (also called mean free path)
>   Hadr04 will give few more details of the parcours of incident neutrons

Thank you so much for your fast reply. I tried to run Hadr03 and Hadr04 examples to figure it out. In both trials, I tried to set G4_Gd as material. The input and output files of my trials are available from the attachments. Even there exist results, I am a bit confused about how to read them. "" and "" are the inputs for 10 MeV neutron on G4_Gd for Hadr03 and Hadr04 examples, respectively. "hadr03_n_out.txt" and "hadr04_n_out.txt" are the outputs.

From "hadr03_n_out.txt";
 MeanFreePath:	6.8409 cm  +- 6.8135 cm 	massic: 54.046 g/cm2 
 CrossSection:	0.14618 cm^-1 		massic: 1.8503 mm2/g 
 crossSection per atom:	4.8315 barn

From "hadr04_n_out.txt";
 Parcours of incident neutron:
   nb of collisions    E>1*eV= 1.05      E<1*eV= 1       total= 2.05
   track length        E>1*eV= 6.9537 cm   E<1*eV= 6.9865 cm    total= 13.94 cm 
   time of flight      E>1*eV= 1.6037 ns  E<1*eV= 1.6116 ns   total= 3.2154 ns

As you mentioned before, hadr03 gives the meen free path and hadr04 gives information about the parcours of neutrons. So, which value should I accept as the maximum penetrating distance; mean free path from Hadr03 or track lenght from Hadr04 ?

Also, I would like to make clear one more topic. I tried Hadr03, Hadr04 and TestEm0 for 10 MeV protons on G4_Gd. The input and output files of those trials are also available from the attachments. TestEm0 uses EM standard physics list and shows the stopping power and range on the output file. Results from it are in agreement with the data taken from PSTAR(NIST) yet there is no any agreement with the results obtained via Hadr03 and Hadr04 examples. Is this due to the physics lists used in the examples or am I doing something wrong? This might be a silly question but please enlighten me.


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1 None: Re: Neutron Range   (michel maire - 12 Dec, 2017)
(_ None: Re: Neutron Range   (M Sek - 15 Dec, 2017)
1 Feedback: Re: Neutron Range   (Michael H. Kelsey - 15 Dec, 2017)
2 None: Re: Neutron Range   (michel maire - 16 Dec, 2017)
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