From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Mon Sep 10 2007 - 10:47:13 CEST
Dear Mary,
(g,n) and (n,g) reactions are different on different nuclei, so you can expect
to get different results concerning nuclear effects (e.g., neutron yield,
residual nuclei). On the other hand, "radiation showers" (you are meaning
electromagnetic showers, I guess) depend on the charge (Z) but very little on
the mass (A) of the nuclei: so it is no surprise that you don't see any
difference.
And even (g,n) reactions have a very weak dependence on A, that cannot give
substantial differences between A = 63 and 65, which differ by less than 2%.
Concerning (n,g) reactions, perhaps one could expect some differences
in the production of residual nuclei between Cu-63 and Cu-65: but the
present neutron library of FLUKA contains only natural copper (see Chap. 10
of the manual). In the new library which is just now in preparation,
also the two individual isotopes will be available (probably near the end of
this year).
Alberto
On Sat, 8 Sep 2007, me@marychin.org wrote:
> Hi.
>
> I ran 3 separate simulations containing the following lines respectively:
> MATERIAL 29 62.9296 1. 26.0 63. COPPER
> MATERIAL 29 63.546 1. 26.0 COPPER
> MATERIAL 29 64.928 1. 26.0 65. COPPER
>
> I'm looking for (g,n) and (n,g) reactions, and expected the 3 simulations to
> produce different radiation showers. However, I've got identical showers from
> the three. Could someone please help?
>
> Thanks,
> mary
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