"shower", "cascade"

From: me@marychin.org
Date: Sat Oct 20 2007 - 15:46:25 CEST

  • Next message: Alberto Fasso': "RE: neutron cut-off energy"

    Dear Alberto,

    Thanks for pointing out my used of the term, 'radiation showers'. I realised that I used the term losely -- partly due to my earlier exposure to e+/e-/photons (started to work with heavier particles only much later) -- no excuse though. I must be careful next time and would like to be sure that I understand correctly at this point: do radiation showers apply to electromagnetic ones only? How about 'cascade'?

    Thanks very much,

    From: Alberto Fasso' [mailto:fasso@slac.stanford.edu]
    Sent: Mon 10-Sep-07 09:47
    To: me@marychin.org
    Cc: fluka-discuss@fluka.org
    Subject: Re: individual isotope

    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
    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).


    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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