Re: p+U reaction

Dear Andrzej,

you are probably looking at the total fluence of neutrons scored with
the USRBDX estimator, crossing the boundary between region R3 and R4.
In my opinion if you want to look for the number of neutrons generated
per primary proton you should look at the standard output file (*.out).
In the list called "Number of secondaries generated in inelastic
interaction per beam particle" you will find that neutrons are something
like 37.8 (depending on the number of primaries you run in the
simulation). This value is much closer to the experimental one.
Cheers,

Lucia

On Jul 14, 2010 04:27 PM, Andrzej Wojciechowski <andrzej_at_cyf.gov.pl>
wrote:

> Dear FLUKA users
> I am traying calculate the total number of neutron produced during
> reaction p+U-238 (see attachment) (1.22GeV)
> The experimental result[1] equal to 38.8+-5%,
> the calculation result egual to 44.0
> What am I doing badly?
>
> Kind regards
> Andrzej
>
> [1] L. Pienkowski,* F. Goldenbaum, D. Hilscher,=C3=A2? and U. Jahnke,
> Neutron
> multiplicity distributions for 1.94 to 5 GeV/c proton-, antiproton-,
> pion-, kaon-,and deuteron-induced spallation reactions on thin and
> thick
> targets.PHYSICAL REVIEW C VOLUME 56, NUMBER 4 OCTOBER 1997
Received on Thu Jul 15 2010 - 15:29:21 CEST