Characterization of specific nuclear reaction channels by deconvolution in the energy space of the total nuclear cross-section of protons - applications to proton therapy and technical problems (transmutations)

Waldemar H Ulmer

Abstract


The total nuclear cross-section Qtot(E) resulting from the interaction of protons with nuclei is decomposed in 3 different contributions: (1) elastic scatter at the complete nucleus, which adopts a part of the proton kinetic energy; (2) inelastic scatter at a nucleus, which changes its quantum numbers by vibrations, rotations, transitions to excited states; 3. proper nuclear reactions with change of the mass and/or charge number. Then different particles leave the hit nucleus (neutrons, protons, etc.), which is now referred to as 'heavy recoil' nucleus.  The scatter parts of Qtot(E) according to points 1 and 2 can be removed by a deconvolution acting at Qtot(E) in the energy space. The typical nuclear reaction channels are mainly characterized by resonances of a reduced cross-section function Qred(E). The procedure is applied to cross-sections of therapeutic protons and also to Cs55137 as an example with technical relevance (transmutations with the goal to drastically reduce its half-time.

Keywords


Proton-nuclei interactions, Elastic/inelastic scatter, Deconvolution of total nuclear cross-section, Reaction channels

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References


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DOI: http://dx.doi.org/10.14319/jpt.21.2

Copyright (c) 2016 Waldemar H Ulmer

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© Journal of Proton Therapy (ISSN 2469-5491)

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