Re: Quasi-monoenergetic neutron beam from Li target

From: Francesco Cerutti <>
Date: Fri, 6 Mar 2009 23:42:17 +0100

Dear Mitja,

first of all you get a poor interaction statistics (less than 1/100 of
beam protons interacts over 7mm of Li, thus you need a LOW-BIAS
card to bias the inelastic scattering length of primaries). Then, consider
that the expected narrow peak - for a FIXED energy of the interacting
proton - at the higher limit of the neutron spectrum, will be spread out
due to the energy range of the interacting protons (the beam loses about
5 MeV in your target).

Kind regards


Francesco Cerutti
CH-1211 Geneva 23
tel. ++41 22 7678962
fax ++41 22 7668854

On Thu, 5 Mar 2009, Mitja Majerle wrote:

> Dear users,
> I am trying to simulate the reaction 7Li(p,n)7Be on the Lithium target with
> the protons in the energy range from 20-100 MeV. We are using proton beam +
> Li target for the production of quasi-monoenergetic neutron beam for
> cross-section measurements etc.
> There is no quasi-monoenergetic peak at the energy of incident protons in the
> results of the simulation. What am I doing wrong ?
> Thank you,
> Mitja
Received on Sat Mar 07 2009 - 09:32:29 CET

This archive was generated by hypermail 2.2.0 : Sat Mar 07 2009 - 09:32:31 CET