0000000001163748
AUTHOR
Torleif E.o. Ericson
Intrinsic magnetic polarizability contribution to susceptibility of dense neutron matter
It is shown that, apart from the neutron interaction contribution to the susceptibility of neutron stars, there is an additional contribution coming from the magnetic polarizability beta /sub n/ of individual neutrons. For beta /sub n/ approximately=10/sup -4/fm/sup 3 /, this part overwhelms the interaction contribution for k/sub F/>or approximately=3.5fm/sup -1/. No transition to ferromagnetic state is predicted in the interesting density region.
Axial current in extended systems
We establish a connection between the nuclear axial current and pionic properties in the medium. As a strict consequence of PCAC alone, the time component has its matrix elements determined by a wave pion absorption to leading order in the momentum transfer. The properties of the system are governed by scale parameters associated both with its size and with the local interaction structure. Based on this observation we suggest a locality condition for the part of the axial current which has no pion pole. It follows that the full axial current can be explicitly constructed from the local s and p wave pion source functions. A model illustration is presented. Our approach unifies in a model ind…