Re: [fluka-discuss]: Help needed for thermal neutrons detection via LIF converter

From: Francesco Cerutti <Francesco.Cerutti_at_cern.ch>
Date: Wed, 1 Oct 2014 16:25:43 +0200

Dear Jamil,

in principle the answer to your second question is yes, and the reason for
your lithium failure is your missed compliance with what is indicated in
the manual, LOW-NEUT card, Note 5:

"In the case of 6-Li, in order to get the *pointwise* treatment [which is
what you need in order to have charged secondaries explicitly generated]
it is mandatory to define the respective monoisotopic material through a
MATERIAL card and name it LITHIU-6".

Pay attention to the fact that this implies to properly fill the WHAT(6)
[not WHAT(2)] of the MATERIAL card (A=6, not Am=6). The presence of 7-Li
requires to define in addition LITHIU-7 and then a Li COMPOUND properly
combining the two.
You defined instead natural Li and assigned to it the 6-Li cross sections
(for *groupwise* treatment), which makes no sense. (And you adopted the
same wrong procedure for Boron, where you perhaps intended to define 10-B
but did a classical mistake putting the mass number in the wrong field
(WHAT(2), that must remain empty)).

Kind regards

Francesco

**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854

On Mon, 29 Sep 2014, 파르자나아호마드 wrote:

> Dear FLUKA Experts,
>
> I am working code for the attached for the detection of thermal neutrons via
> Lithium -6 converter for my detector set-up.
>
> The attached code work nicely for the Boron-converter material. However it is
> strange and we could not find the secondary particle detection with this code
> with Lithium-6 material.
>
>
> 1) We further could not find the escape probability of the secondary particle
> via Lithium-6. Why it is so does not know the reason?
>
> 2) Is this possible via FLUKA- to simulate the Compound material like LIF or
> B4C to utilize them as converter and find the thermal neutrons detection via
> them?
>
> Needed help in this regard.
>
> Jamil
Received on Wed Oct 01 2014 - 18:04:00 CEST