RE: Problems with RESNUCLEI

Hi Francesca,

I had a quick look into your results and saw that you've high
statistical uncertainties in both runs (especially the one with 1x).
Without going into the physics, this can easily explain the observed
variations, thus you might want to increase your interaction length
biasing or the number of particles/histories.

cheers

Markus

> -----Original Message-----
> From: owner-fluka-discuss@mi.infn.it [mailto:owner-fluka-
> discuss@mi.infn.it] On Behalf Of Francesca Belloni
> Sent: 01 September 2008 18:09
> To: fluka-discuss@fluka.org
> Subject: Problems with RESNUCLEI
>=20
> Dear all,
> I'm trying to calculate the number of fission fragments
> detected
> in a gas cell as a function of the target thickness, but I make some
> mistakes.
> As a first step I'm using two 235U targets of thickness
> x=3D1.7693E-5 cm and 2x=3D3.5385E-5. In order to avoid considering Ar
> itself
> or products of its interactions, I made a sum on the number of
> fragments
> given by RESNUCLEI in region 4.0 only for A>44 (that is
> n1+n2+n3+...with
> n1=3D# of nuclei with A=3D45,n2=3D# of nuclei with A=3D46,n3=3D# of =
nuclei with
> A=3D47,...). Does this 44 make sense?
>=20
> In the case of thickness 2x, the sum is S1=3D4.886207e-07 (n/pr)while
> for
> thickness x the sum is S2=3D2.361045e-07 (n/pr). But it should be 2*S2
> > S1,
> which is not what I obtained.
> I include the input files and the *sum.lis obtained using usrsuw for
> "all
> residual nuclei are scored".
> Could anyone give me some hint, please?
>=20
> Thanks,
> best regards,
> Francesca Belloni
Received on Sat Sep 6 15:10:56 2008