Argonne PowerPoint Presentation - Spallation Neutron Source
Argonne PowerPoint Presentation - Spallation Neutron Source
Argonne PowerPoint Presentation - Spallation Neutron Source
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<strong>Spallation</strong>-Evaporation<br />
Production of <strong>Neutron</strong>s<br />
Original<br />
Nucleus<br />
Excited<br />
Nucleus<br />
Residual<br />
Radioactive<br />
Nucleus<br />
Ep<br />
Proton<br />
~10 –20 sec<br />
> 1 sec<br />
~<br />
‘<br />
‘<br />
‘<br />
e<br />
γ<br />
‘<br />
‘<br />
‘<br />
‘<br />
‘<br />
γ<br />
Recoiling particles<br />
remaining in nucleus<br />
‘<br />
‘<br />
e<br />
‘<br />
γ<br />
Emerging “Cascade” Particles<br />
(high energy, ~ E < Ep) (n, p. π, …)<br />
(These may collide with other<br />
nuclei with effects similar to<br />
that of the original proton<br />
collision.)<br />
Evaporating Particles<br />
(Low energy, E ~ 1–10 MeV);<br />
(n, p, d, t, … (mostly n)<br />
and γ rays and electrons.)<br />
Electrons (usually e + )<br />
and gamma rays due to<br />
radioactive decay.<br />
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