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Question Neutron capture by fluorine 

Keywords: radiative neutron capture fluorine
Forum: Hadronic Processes
Date: 10 Oct, 2007
From: Rachel Faust <>


I am looking at the interactions that occur between low energy neutrons and a target that contains fluorine-19. When an interaction occurs, I record the following information:

G4Track * aTrack = aStep->GetTrack(); dE = (aTrack->GetVertexKineticEnergy()/keV);

I have been observing what I think is radiative neutron capture since fluorine-20 nuclei are being formed. I would like to know how to interpret the vertex kinetic energy in such a reaction. For example, if I shoot neutrons with an initial energy of 50keV, I record vertex kinetic energies of 27keV and 50keV which correspond to (n,gamma) resonances. I would like to confirm that those energies correspond to that of the F20 nuclei, and not to that of the neutrons.

Also, I don't seem to observe the emission of the expected 6,6MeV gamma. There is always one gamma that is emitted, but its energy can vary from 60keV to 6MeV. Any thoughts on what is happening?

Thank you.

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