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Inverse beta-decay of arbitrarily polarized neutrons in a magnetic field

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arxiv hep-ph/0209053 v2 pith:P2S7OZQE submitted 2002-09-05 hep-ph astro-ph

classification hep-phastro-ph
keywords crossfieldmagneticsectioninitialinverseneutronspolarization
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We calculate the cross section of the inverse beta decay process, $\nu_e+n\to p+e$, in a background magnetic field which is much smaller than $m_p^2/e$. Using exact solutions of the Dirac equation in a constant magnetic field, we find the cross section for arbitrary polarization of the initial neutrons. The cross section depends on the direction of the incident neutrino even when the initial neutron is assumed to be at rest and has no net polarization. Possible implications of the result are discussed.

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