Interaction current in $p p o p p γ$ - Nuclear TheoryReport as inadecuate

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Abstract: The nucleon-nucleon bremsstrahlung reaction is investigated based on a fullygauge-invariant relativistic meson-exchange model approach. In order to accountconsistently for the complicated part of the interaction current which atpresent is too demanding to be calculated explicitly, a generalized contactcurrent is introduced following the approach of Haberzettl, Nakayama, andKrewald Phys. Rev. C74, 045202 2006. The contact interaction current isconstructed phenomenologically such that the resulting full bremsstrahlungamplitude satisfies the generalized Ward-Takahashi identity. The formalism isapplied to describe the high-precision proton-proton bremsstrahlung data at 190MeV obtained at KVI H. Huisman et al., Phys. Rev. C65, 031001R 2002. Thepresent results show good agreement with the data, thus removing thelongstanding discrepancy between the theoretical predictions and experimentaldata. The present investigation, therefore, points to the importance ofproperly taking into account the interaction current for this reaction.

Author: K. Nakayama, H. Haberzettl


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