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Persistence of the Polarization in a Fusion Process

Published online by Cambridge University Press:  22 March 2011

J.-P. Didelez  and
C. Deutsch
J.-P. Didelez*
Affiliation:
IPN, CNRS/IN2P3 & Université Paris-Sud (UMR-CNRS 8608), Orsay, France
C. Deutsch
Affiliation:
LPGP, Université Paris-Sud (UMR-CNRS 8578), Orsay, France
*
Address correspondence and reprint requests to: J.-P. Didelez, IPN, CNRS/IN2P3 & Université Paris-Sud (UMR-CNRS 8608), Bât. 100, F-91406 ORSAY, France. E-mail: didelez@ipno.in2p3.fr
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Abstract

We propose an experiment to test the persistence of the polarization in a fusion process, using a terawatt laser hitting a polarized high density (HD) target. The polarized protons and deuterons heated in the plasma induced by the laser have a significant probability to fuse producing a 3He and a γ-ray or a neutron in the final state. The angular distribution of the radiated γ-rays and the change in the corresponding total cross-section are related to the polarization persistence, but the resulting signal turns out to be weak. By comparison, the neutrons are produced hadronically with a larger cross-section and it is much easier to detect them. A significant reduction of the cross-section by parallel polarization of the deuterons as well as a structured angular distribution of the emitted neutrons is reliably predicted by the theory. Therefore, it is expected that the corresponding signal on the neutron counting rate could be seen experimentally. Magnetic fields, relaxation times and possibilities of local investigations are discussed.

Keywords

Fusion reactionsMagnetic fieldsNeutron detectorPersistence of the polarizationPolarized targetsRelaxation timesSuppression factorsUltra short lasers
Type
Research Article
Information
Laser and Particle Beams , Volume 29 , Issue 2 , June 2011 , pp. 169 - 174
Copyright
Copyright © Cambridge University Press 2011

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