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None correct thermal neutron cross section data set for a sapphire (Al2O3) crystal in Geant4  

Forum: Event and Track Management
Date: 01 May, 2010
From: naima <naima>

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Hi there =2C
Please =2C I need your helps.
> As you know in my work=2CI try to simulate interactions of neutrons with =
material (this is for neutron diffraction experiment)=20
In particular=2C now I try to optimise the dimensions of the shielding mate=
rial composed of Al2O3 as filter thermal neutrons ...is about the sapphire =
crystal. As you  know=2C there is no predefined thermal neutron  cross sect=
ion data set for the sapphire crystal. the calcul in the simulation don't g=
ive the correct answer because of this problem. I think the definition of t=
he sapphire an amorphous material with homogeneous Al and O distribution at=
 defined concentrations. For neutrons with energies  higher than 1 eV=2C th=
is approach works=3B but for thermal neutrons it doesn't. I don't know how =
to generate correct thermal neutron cross section data set for  a sapphire =
crystal in Geant4.=20
Many thanks.                                                               =
                                                                           =
                         =20
Cheers
Naima
PS: I am not sure if i am clear=2C I can send more informations if needed. =
          =20
_________________________________________________________________
Hotmail : une messagerie fiable avec la protection anti-spam performante de=
 Microsoft
https://signup.live.com/signup.aspx?id=3D60969=

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Hi there =2C<BR>Please =2C I need your helps.<BR>&gt=3B As you know in my w=
ork=2CI try to simulate interactions of neutrons with material (this is for=
 neutron diffraction experiment) <BR>In particular=2C now I try to optimise=
 the dimensions of the shielding material composed of Al2O3 as filter therm=
al neutrons ...is about the sapphire crystal. As you&nbsp=3B know=2C there =
is no predefined thermal neutron &nbsp=3Bcross section data set for the sap=
phire crystal. the calcul in the simulation don't give the correct answer b=
ecause of this problem. I think the definition of the sapphire an amorphous=
 material with homogeneous Al and O distribution at defined concentrations.=
<B><FONT color=3D#ff0000> For neutrons with energies&nbsp=3B higher than 1 =
eV=2C this approach works</FONT></B>=3B <B><FONT color=3D#ff0000>but for th=
ermal neutrons it doesn't.</FONT></B> <FONT color=3D#ff0000><B>I don't know=
 how to generate correct thermal neutron cross section data set for&nbsp=3B=
 a sapphire crystal in Geant4. </B></FONT><BR>Many thanks. &nbsp=3B&nbsp=3B=
&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nb=
sp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=
=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B=
&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nb=
sp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=
=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B=
&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nb=
sp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=
=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B=
&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nb=
sp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=
=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B=
&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nb=
sp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=
=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B=
&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nb=
sp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=
=3B&nbsp=3B <BR>Cheers<BR>Naima<BR>PS: I am not sure if i am clear=2C I can=
 send more informations if needed.            <br /><hr />Hotmail : une mes=
sagerie fiable avec la protection anti-spam performante de Microsoft <a hre=
f=3D'https://signup.live.com/signup.aspx?id=3D60969' target=3D'_new'>Inscri=
vez-vous</a></body>
</html>=

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