Re: individual isotope

From: Paola Sala (
Date: Mon Sep 10 2007 - 09:08:13 CEST

  • Next message: Alberto Fasso': "Re: individual isotope"

    Hi Mary

    The answers depends on what are you looking for, and at which energy:

    for instance, if you use as projectile neutrons below 20 MeV, you will
    get exactly the same results for all calculations, simply because the
    neutron cross section data set is the same, there is no separate data
    set for the different copper isotopes (while there are different ones
    for Uranium and others)

    In general, if you are looking to general shower behaviour in a thick
    target, I expect no big difference, the two isotopes do not have very
    different properties and as soon as low energy neutron are produced,
    they will behave the same for all copper isotopes.

    To see any difference, your set up should be such as to minimize the
    importance of low energy neutron interactions, and the "observable "
    should be a specific one, for instance residual nuclei distribution.


    On Sat, 2007-09-08 at 20:42 +0100, 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

  • Next message: Alberto Fasso': "Re: individual isotope"

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