Re: [fluka-discuss]: calculate neutron yield_spallation

From: Vittorio Boccone <>
Date: Wed, 15 Jul 2015 21:48:56 +0200

Dear Eleni,
 you seem to to use and USRBIN scoring NEUTRON (or better NEUTRON fluence).

First NEUTRON generalized particle type will not give directly the quantity
as it does not include neutrons generated below 20 MeV, i.e. (n,2n) or
(n,3n) reactions, second the USRBIN is not really doing that type of job.
An option - without writing and linking your routine - is to use the
NEU-BALA which gives you the sum of all neutrons.

The problem is that you must use the same type of estimator/scoring
quantity and technique in both codes. And this is not always


On Wed, Jul 15, 2015 at 11:03 AM, Eleni Adamidi <>

> Hello,
> I am interested in calculating how many neutrons are generated in
> inelastic interactions per beam particle when a proton beam of 960 MeV hits
> a Pb target of 61cm diameter and 10,2height.
> The result I get is :
> 1.0596E+01 (63.9%) 0.0000E+00 ( 0.0%) NEUTRON
> so the neutron yield is 10.596, but compared with the same simulation in
> MCNPX (neutron yield = 17.910) there is a big deviation.
> I am attaching my input file in case you could check if there is something
> wrong.
> Thank you very much in advance,
> Eleni Adamidi

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Received on Wed Jul 15 2015 - 23:21:03 CEST

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