Hi Rob
I knew that the Coulomb Barrie is high for 6 MeV protons to initiate Nuclear reactions with Ta-181, but "Deon" was convinced that we should see something since the (p,n) reaction cross sections are nonzero even below 6 MeV.
Nevertheless, I didn't see neutrons until I literally increased the beam energy to 9.6 MeV. That's where the confusion came up between the cross section data and FLUKA results.
Regards
Nkanyiso R. Mantengu
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From: Francesco Cerutti
Sent: Sunday 14 May 12:05
Subject: Re: [fluka-discuss]: Hadron-nucleon interaction cross-sections
To: NKANYISO ROBERT Mantengu
Cc: fluka-discuss_at_fluka.org
If you are interested in sub-barrier neutron production by protons, I'm afraid that at present there is no FLUKA solution. Kind regards Francesco ************************************************** Francesco Cerutti CERN-EN/STI CH-1211 Geneva 23 Switzerland tel. ++41 22 7678962 fax ++41 22 7668854 On Fri, 12 May 2017, NKANYISO ROBERT Mantengu wrote: > Dear Francesco > > Thanks for your answer. > > So what could be the solution in this case? > > Ragrads > Nkanyiso R. Mantengu > > On Fri, May 12, 2017 at 5:01 PM, Francesco Cerutti > wrote: > > Dear Nkanyiso, > > you have a point. > > FLUKA does not use cross section libraries, except for > interactions induced by neutrons below 20 MeV. > It uses its own models for calculating the sharing among the > different reaction channels and its own parametrizations for > calculating the reaction cross section. Here the issue is with > the latter, whose sub-barrier extension (below 10 MeV proton > energy in this case) is just missing and prevents you from > simulating neutron production in that range. > > Best regards > > Francesco > > ************************************************** > Francesco Cerutti > CERN-EN/STI > CH-1211 Geneva 23 > Switzerland > tel. ++41 22 7678962 > fax? ++41 22 7668854 > > On Fri, 12 May 2017, NKANYISO ROBERT Mantengu wrote: > > Dear FLUKA users > > I'm simulating the Ta-181(p,n)W-181 reaction. > > Beam properties? > ?*? 6 MeV energy proton beam. > ?*? 200 micro A current. > > My problem is that I don't see any neutrons until I > set the beam energy to 9.6 MeV which is in > contrast with the cross section plot (attached > below) produced using the EXFOR cross section > data. > > So my question is what cross section library is used > to handle hadron-nucleon interactions in > PEANUT model. > > Any help/comments will be appreciated. > Thanks in advanced. > > NB: The FLUKA input is also attached in this email. > > Regards, > Nkanyiso R. Mantengu > > > > Disclaimer - This e-mail is subject to UWC policies > and e-mail disclaimer published on our > website at: >
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Received on Sun May 14 2017 - 14:16:19 CEST