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Physica Scripta

Comments on cold neutron confinement by an electromagnetic classical field

Stanley A. Bruce

Published Jan 17, 2007• 0 citations
Publisher

Abstract

Regarding a recent paper (Bruce S 2006 Phys. Scr. 74 371), we comment on cold neutron confining in a system consisting of an Aharonov–Casher together with a properly set Aharonov–Bohm configuration. We find that, for the supersymmetric ground state, an extra spin–orbit (spin-electromagnetic angular momentum density) term should be present. This effect turns out to modify the phenomenology associated with the anomalous magnetic moment of the neutron.

DOI
10.1088/0031-8949/75/2/019

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•Jun 1, 1994•0 citations
Regarding a recent paper (Bruce S 2006 Phys. Scr. 74 371), we comment on cold neutron confining in a system consisting of an Aharonov–Casher together with a properly set Aharonov–Bohm configuration. We find that, for the supersymmetric ground state, an extra spin–orbit (spin-electromagnetic angular momentum density) term should be present. This effect turns out to modify the phenomenology associated with the anomalous magnetic moment of the neutron.
Recent neutron interferometry experiments have been interpreted as demonstrating a new topological phenomenon similar in principle to the usual Aharonov-Bohm (AB) effect, but with the neutron's magnetic moment replacing the electron's charge. We show that he new phenomenon, called scalar AB (SAB) effect, follows from an ordinary local interaction, contrary to the usual AB effect, and we argue that the SAB effect is not a topological effect by any useful definition. We find that SAB actually measures an apparently novel spin autocorrelation whose operator equations of motion contain the local torque in the magnetic field. We note that the same remarks apply to the Aharonov-Casher effect.