Message: Re: Element definition Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

None Re: Element definition 

Forum: Geometry
Re: Question Element definition (Steve Quillin)
Date: 09 Jul, 2015
From: michel maire <michel maire>

On Tue, 07 Jul 2015 18:57:25 GMT, Steve Quillin wrote:
> Hello
> I'm trying to simulate some publicised data on spallation and have made
> a simple Geant4 application that fires 1 GeV protons into a 10 cm
> uranium sphere and counts the numbers of neutrons emitted. My problem is
> with the material definition: results seem to be dependant on the order
> in which I add isotopes to an element.
> My material definitions and the results of "printing" them are attached
> below. All 3 materials appear identical apart from the isotope order,
> yet the neutron multiplicity is smaller by a factor of ~2 (geometry
> dependant) when the target sphere is built from Uranium_b than the
> others. The fraction of protons that generate neutrons is the same for
> all materials.
> Have I made an error in the material definitions or is there something
> else going on?
> I'm using geant4-10-01-patch-01 multithreaded with QGSP_BIC and other
> physics lists.

  I ran example Hadr03 with the 2 Uranium definitions.
  I attach macro and extract of outputs (which are big, at 1 GeV)
  The number of generated neutrons are close, althrough not exactly the same.
  (spectrum in attachment)

  I do not know how much is signifiant this difference of behaviour between the 2 material definitions.


Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 None: Re: Element definition   (Steve Quillin - 10 Jul, 2015)
 Add Message Add Message
to: "Re: Element definition"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews

[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]