Dear Annamaria
Probably I do not understand correctly your question, I'll try some hints:
You do not need anything specifics for alphas, besides the low-pwxs.
The PRECISION default already activates the transport of all ions,
and the transport of neutrons down to thermal.
LOW-PWXS refer to neutrons...but: If it is not there, neutron
interactions are treated in a "multi-group" approach. This means both a
treatment based on neutron energy intervals, and some limitation in the
outcome of interactions,. In particular protons, alphas and other
charged are not really generated, their energy is simply deposited on
the point of production--> no alphas
With low-pwxs, you get two things: continuous neutron energy, AND fully
correlated generation of all interaction products--> yes alphas
Then, I see a problem in your geometry: the second target region
(regSiC4) does not exist: it is defined as contained in a 10 micron long
cylinder, and downstream
of a plane at 2.5 cm from the cylinder entrance. This is a null region,
thus you'll get no results from your boundary crossings.
In view of the short alpha range, if you want to be sure to see them it
would be worthwhile to add a usrtrack or a userbin scoring alphas within
the target.
You can also look at the fluka output file, at the end there is a
summary of particles produced in the run
Hope this helps
Paola
On 3/17/24 23:16, muoio wrote:
>
> Thanks very much for the quick response,I looked the manual
>
> http://www.fluka.org/content/manuals/online/LOW-PWXS.html
>
> but for alpha particles do you have some example?
> thanks a lot
> A. Muoio
>
> Il 2024-03-17 19:02 Paola Sala ha scritto:
>> Hello
>> in order to produce and transport charged particles from low energy
>> neutron interactions you have to activate the new point-wise
>> treatment,
>> by adding the LOW-PWXS card.
>> Please have a look at its description in the manual, and ask if
>> something is not clear
>> Regards
>> Paola
>> On 3/16/24 16:08, muoio wrote:
>>>
>>> good morning experts, I tried to insert the analysis request for
>>> alpha particles into my simulation, but I get a result that I don't
>>> expect... practically zero.
>>> The situation is
>>>
>>> Energy Neutron = 14.1 MeV Number of primary= 10^8 x 5 run
>>> Fluence = 4.45 10^11 (n/cm2) Profile Beam=Flat
>>> Surface = (5 x 5) mm
>>> Spessore 100 um
>>>
>>> I expect alpha particles from secondary reactions induced by the
>>> interaction of neutrons with SiC.
>>> I attach the *.inp file that I tried to run
>>>
>>> thanks a lot
>>> Annamaria Muoio
>>>
>>>
>>>
>
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Received on Mon Mar 18 2024 - 19:27:03 CET