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Question Boron neutron capture 

Keywords: boron neutron capture
Forum: Hadronic Processes
Date: 21 Nov, 2006
From: <me@marychin.org>

Hi.

I'm looking at neutron interactions in Boron. At incident energies 0.6 MeV and above, as expected, alphas and Li7 are produced, sometimes accompanied by a 0.48 MeV photon corresponding to the de-excitation of Li7.
However, at incident energies 0.5 MeV and below, the B(n,a)Li event stops happening -- not even 'by proxy' of releasing the 0.48 MeV photon?

Also, if I look at photons produced directly as secondaries by neutrons, the photon energy histogram is M-shaped: peaks around 1.5 MeV and 7 MeV, valley around 4 MeV? How do I explain this M shape? I expected the photon spectrum to be sharp discrete spikes characteristic of the reaction.

Help will be much appreciated.

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