RE: [fluka-discuss]: missing neutron cross sections

From: Benmerrouche, Mohamed <Benmerrouche_at_bnl.gov>
Date: Fri, 17 Feb 2017 19:42:22 +0000

Hi Francesco:

Thank you so much for the suggestion. My target is about 1.5 mm which I assume is sufficiently thin enough to make neutron contribution to the activation of the target negligible.
What FLUKA card should I use to discard neutron transport in the target only and keep neutrons transport elsewhere activated?

Mo
-----Original Message-----
From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Francesco Cerutti
Sent: Friday, February 17, 2017 7:03 AM
To: FLUKA discussion
Subject: Re: [fluka-discuss]: missing neutron cross sections


Of course I'm referring to the target activation only, without neutrons you will get no activation estimate elsewhere.

On Fri, 17 Feb 2017, Francesco Cerutti wrote:

>
> Hi Mo,
>
> if you discard neutrons, which cannot be properly transported in the
> absence of the respective cross sections, you will get an estimation
> of the activation due to the primary beam, neglecting the contribution
> of neutron reinteractions. If your target is sufficiently thin, such
> an estimation may still make some sense (apart from uncertainties
> related to the rather low proton energy).
>
> Cheers
>
> Francesco
>
>> Hi Mohamed,
>
>> I had a same prob with the neutron libraries for Tellurium.
>
>> Cheers,
>> Shri
>
> (Srinidhi Bheesette)
>
> On 14 February 2017 at 06:16, Benmerrouche, Mohamed
> <Benmerrouche_at_bnl.gov>
> wrote:
>
>> Dear FLUKA experts/users,
>>
>> I am trying to setup an activation study with a 16MeV proton beam on
>> Ra-226 target but when I run my input file FLUKA exits with the
> following
>> error message:
>>
>> ***** Neutron Xsec: ****
>> **** Group limits, average energies, velocities and momenta start at
>> location 10422717, end at location 10424884 (I*4 addr.) *****
>>
>> **** Low energy neutron xsec not found for some media 12 13 ****
>> RADIUM
>>
>> Which indicate that low energy neutron cross sections for Ra-226 are
>> not available in the FLUKA code. I checked the FLUKA manual section
>> 10.4.1.2 and confirmed that there is NO entry for Radium.
>>
>> Any suggestions or thoughts on how to resolve this issue?
>>
>> Thanks,
>> Mo
>
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Received on Fri Feb 17 2017 - 22:00:18 CET

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