Re: copper bombarded by 10 MeV proton

Dear all,

I agree with Francesca's commands, I also find the neutron yield bombarded by proton lower than 15 MeV is lower than values in literature, I am looking forward to the explanation
about it.

All the best
Yuanjie

> 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 Sun Jun 13 2010 - 12:54:08 CEST