Re: [fluka-discuss]: Thermal peak in neutron spectrum

From: Santana, Mario <msantana_at_SLAC.Stanford.EDU>
Date: Thu, 31 Mar 2016 17:57:59 +0000

Hi Felix,

Wouldn¹t Lethargy units displace the peak {dn/dE,E} which you are
comparing to?


On 3/31/16, 2:44 AM, " on behalf of Felix"
< on behalf of>

>Dear FLUKA experts,
>I scored photoneutron spectra at several positions within a electron
>linac bunker and plotted them as normalized fluence per unit lethargy
>(see attachment). Position 1 lies directly beneath the source, position
>2 some meters away and position 3 within a maze.
>At about 80 meV a peak arises and i thought that it should correspond to
>the thermalized neutron energy (k*T), but wouldn't that indicate a
>moderator temperatur of about 650 degrees Celsius?
>I did not change any LOW-MAT properties in my input file, so i thought
>FLUKA would use the neutron cross section sets corresponding to room
>temperature (296 K), which should give a peak at about 25 meV instead.
>Are you able to understand this effect and are there any mistakes in my
>Thank you in advance
>Best Regards
>Felix Horst, M.Sc.
>Institut für Medizinische Physik und Strahlenschutz (IMPS)
>Technische Hochschule Mittelhessen
>Wiesenstr. 14, 35390 Gießen
>Raum D10.12a
>Telefon: 0641 309 2642

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Received on Fri Apr 01 2016 - 16:48:56 CEST

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