Re: copper bombarded by 10 MeV proton

Dear all,

I have a similar problem even if I use a lower threshold for protons.
The problem is not only at 10 MeV, but for a larger range of energies
(4-15MeV) where the cross sections of production are lower than the
values in literature. I found this error mostly for natCu+p to Zn(63)
and natNi+p to Cu(60). I have already signaled this error to Paola Sala,
but, I guess, there is no correction yet. Any news?

A graph of the cross sections of production of Cu(60) from natNi+p and
one of Zn(63) from natCu+p are attached.

All the best
Francesca

Francesca Fiorini
Medical Physics Group,
School of Physics and Astronomy,
University of Birmingham,
Edgbaston Park Road,
B15 2TT,
Birmingham,
UK

> Hi
>
> You run without default settings. That means the NEW-Def settings are
> used.
>
> The particle transport threshold for protons is set at 10 MeV, meaning
> you start your protons and kill them immediately.
>
> I propose to use a lower particle threshold for protons. One way to do
> so is the use of Default Precision settings (100 keV).
> Details for Defaults:
> http://www.fluka.org/fluka.php?id=man_onl&sub=21
>
>
> Cheers
> Helmut
>
>
> -----Original Message-----
> From: owner-fluka-discuss_at_mi.infn.it
> [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of
> biyuanjie_at_tsinghua.org.cn
> Sent: Mittwoch, 9. Juni 2010 04:41
> To: fluka-discuss_at_fluka.org
> Subject: copper bombarded by 10 MeV proton
>
> Dear all,
>
> I want to record the total number of neutrons from copper bombarded by
> proton of different energy. I find from Exfor that the cross sections of
> cu65(p,n)zn65 is not zero,
> but when I do simulation with fluka, no neutron is emitted. Below is my
> input file, could somebody give me some help
>
> Thanks
> Yuanjie
>
> *
> ..+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> TITLE Cu collimator 72 MeV proton
> *
> ..+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> BEAM -0.01 -0.0 -0.0 -0.0 -0.0
> PROTON
> BEAMPOS 0.0 0.0 0.0
> GEOBEGIN COMBNAME
> 0 0 A Cu collimator
> RPP body1 -5000000.0 +5000000.0 -5000000.0 +5000000.0 -5000000.0
> +5000000.0
> RPP body2 -1000000.0 +1000000.0 -1000000.0 +1000000.0 -100.0
> +1000000.0
> RCC elli 0.0 0.0 1. 0.0 0.0 0.024 0.3
> END
> * black hole
> regBH1 5 +body1 -body2
> * vacuum around
> regVA2 5 +body2 -elli
> regIn 5 +elli
> END
> GEOEND
> * External Black Hole
> ASSIGNMA BLCKHOLE regBH1
> * Vacuum
> ASSIGNMA VACUUM regVA2
> ASSIGNMA COPPER regIn
> LOW-NEUT 260.
> USRBIN 10. NEUTRON -60. 3. 3.
> 3.fie
> USRBIN -3. -3. 0.0 30. 1. 30.&
> * Boundary crossing fluence in the middle of the target (log intervals,one-way)
> USRBDX 101. NEUTRON -47.0 regIn regVA2
> 1.0piFluenUD
> USRBDX 0.1 0.0 100. &
> * Boundary crossing current in the middle of the target (log intervals,one-way)
> USRBDX 1. NEUTRON -48. regIn regVA2
> 1.0piCurrUD
> USRBDX 0.1 0.0 100. &
> *
> ..+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> RANDOMIZ 1.0
> *
> ..+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
> START 1000000.0 0.0
> STOP
>
>
>
Received on Fri Jun 11 2010 - 15:47:25 CEST