Dirac-Foldy term and the electromagnetic polarizability of the neutron

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.55.419· OSTI ID:435278

Bawin, M ^[1]; Coon, S A ^[2]

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1. Universite de Liege, Institut de Physique B5, Sart Tilman, 4000 Liege 1 (Belgium)
2. School of Physics, Research Center for High Energy Physics, University of Melbourne, Parkville, Victoria, (Australia) 3052

We reconsider the Dirac-Foldy contribution {mu}{sup 2}/m to the neutron electric polarizability. Using a Dirac equation approach to neutron-nucleus scattering, we review the definitions of Compton continuum ({bar {alpha}}), classical static ({alpha}{sub E}{sup n}), and Schr{umlt o}dinger ({alpha}{sub Sch}) polarizabilities and discuss in some detail their relationship. The latter {alpha}{sub Sch} is the value of the neutron electric polarizability as obtained from an analysis using the Schr{umlt o}dinger equation. We find in particular {alpha}{sub Sch}={bar {alpha}}{minus}{mu}{sup 2}/m, where {mu} is the magnitude of the magnetic moment of a neutron of mass m. However, we argue that the static polarizability {alpha}{sub E}{sup n} is correctly defined in the rest frame of the particle, leading to the conclusion that twice the Dirac-Foldy contribution should be added to {alpha}{sub Sch} to obtain the static polarizability {alpha}{sub E}{sup n}. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 435278
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 55; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DIRAC EQUATION
ELECTROMAGNETIC INTERACTIONS
MAGNETIC MOMENTS
MASS
NEUTRON REACTIONS
NEUTRONS
POLARIZABILITY
SCHROEDINGER EQUATION