Abstract
Claims that the standard single-particle, parity-non-conserving, nucleon-nucleus interaction, Vpnc = ct · 12 {σ · p, ϱ(r)}, is a surface one are considered. It is shown that examination of integrands entering some quantity involving Vpnc leads to quite puzzling results. These are further supported by a similar examination for a term [σ · p, ϱ(r)] which is odd under time-reversal, but has a priori a well-defined surface character. Alternative approaches to determine whether Vpnc is a surface or volume interaction are developed, based on using wave functions as test functions. From these approaches, the volume character of Vpnc is unambiguous.
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