(no subject)

From: Giuseppe Battistoni <Giuseppe.Battistoni@mi.infn.it>
Date: Tue Apr 08 2008 - 10:30:19 CEST

Date: Tue, 8 Apr 2008 10:20:03 +0200
From: Vasilis Vlachoudis <Vasilis.Vlachoudis@cern.ch>
Organization: CERN
User-Agent: Thunderbird (X11/20080226)
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To: John Clem <clem@bartol.udel.edu>
CC: <fluka-discuss@fluka.org>
Subject: Re: ENDRAW
References: <200804071404.m37E4tn3018982@smtp1.mi.infn.it>
In-Reply-To: <200804071404.m37E4tn3018982@smtp1.mi.infn.it>
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Dear John,

as it is written in the FLUKA manual, during low energy neutron transport
only proton recoils are produced from H and N(n,p).

"Generation of charged particles
 Recoil protons and protons from N(n,p) reaction are produced and
 transported explicitly, taking into account the detailed kinematics
 of elastic scattering, continuous energy loss with energy straggling,
 delta ray production, multiple and single scattering."

all the rest you will see it as kerma deposition. Not very useful
quantity for you since it is the average kinetic energy release to
matter per neutron group.

Not in the next, but in a following FLUKA release dpa will be included
as a generalized scoring particle. This will be a quantity of interest
for you, since the recoil of Carbon at these energies thought
non-ionizing energy loss will produce defects in matter. And dpa is
related with the energy of the primary knock-on atom.

Best Regards

John Clem wrote:
> All,
> We are in the process of studying energy deposition of ~2MeV neutrons in
> scintillator materials (as a ToF study). In our test case, we setup a
> rectangular parallelepiped (RPP) 30X30X4cm filled with CH2 ~1g/cm^2 and
> the 30x30 surface was illuminated with a perpendicular 2MeV Neutron
> pencil beam. Threshold for protons are set E>2MeV such that all recoils
> are reported in ENDRAW as depositions, however I can not find an
> obviously way to seperate Proton recoils from Carbon in ENDRAW as JTRACK
> = 308 (low energy neutron kerma) is reported for both cases. An
> alternative of course is the lower the proton threshold so it can be
> tracked in MGDRAW main, however this will increase the output size
> (excluding some level of processing inside MGDRAW). Any suggestions ??
> Thanks,
> John
> John Clem
> Research Associate Professor
> Bartol Research Institute
> Department of Physics and Astronomy
> University of Delaware
> Newark, DE 19716 USA=20
> 302-831-4354

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Received on Tue Apr 8 10:31:58 2008

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