Re: 10-B(n,t gamma)4-He

Hi All

Since Alfredo has clarified that it is possible to score alpha from
10B, I have been trying a simple exercise; a central detector
surrounded by paraffin with source of neutrons outside paraffin. The
input is attached with this. I am unable to score alpha particles with
with Bf3 or with just 10B. Indeed, from the output I see that the
pointwise cross section is not activated at all. However, with 6Li
substituted for Bf3, I get alphas as expected in the detector and the
output file too shows that the pointwise cross section has been
invoked.

Am I missing something?

Is it possible to score 3He(n,p) reaction also ?

Best Regards
Sunil

On 3/19/09, Alfredo Ferrari <alfredo.ferrari_at_cern.ch> wrote:
> Hi Sunil
>
> yes opf course it was meant to be 10B(n,alpha)7Li
>
> The confusion probably stemmed from 6Li(n,t)4He which is missing in the
> list, so that 6Li(n,t)4He, 10B(n,alpha)7Li became 10B(n,t)4He
> which obviously is nonsense. The mistake is repeated twice in the manaul, I
> am going to correct it
>
> Ciao
> Alfredo
>
>
> +----------------------------------------------------------------------+
> | Alfredo Ferrari || Tel.: +41.22.76.76119 |
> | CERN-EN/STI || Fax.: +41.22.76.69474 |
> | 1211 Geneva 23 || e-mail: Alfredo.Ferrari_at_cern.ch |
> | Switzerland || |
> +----------------------------------------------------------------------+
>
> On Wed, 18 Mar 2009, Sunil C wrote:
>
>
> > Hi FLUKA authors
> >
> > In the manual, the LOW-NEUT card has the following.
> >
> > "WHAT(6) = i0 + 10 * i1:
> > i0 = 1: available pointwise cross sections used (see Note below) and
> > explicit and correlated 6-Li(n,gamma)7-Li,10-B(n,t gamma)4-He,
> > 40-Ar(n,gamma)41-Ar,x-Xe(n,gamma)x+1-Xe and
> 113-Cd(n,gamma)114-Cd
> > photon cascade requested.
> >
> > Pointwise neutron transport is available, by setting WHAT(6) = 1.0 or
> > 11.0, for the following nuclides: 1-H (above 10 keV), 6-Li (all
> > reactions), 10-B (only for the reaction 10-B(n,t gamma)4-He). Recoil
> > protons are always transported explicitly, and so is the proton from
> > the 14-N(n,p) reaction, for which a pointwise treatment is always
> > applied"
> >
> > I did not understand the "10-B(n,t gamma)4-He" part. NNDC web site has
> > B-10(N,T+2A) cross section listed, but not (n,t).
> > Is it meant to be 10B(n,alpha)7Li ?
> >
> > Best Regards
> >
> > Sunil
> >
> >
> >
>

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Received on Thu Mar 19 2009 - 08:43:03 CET