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The two-photon momentum distribution of annihilating electron-positron pairsin ferromagnetic nickel (Ni) was determined by measuring the spin-polarizedtwo-dimensional angular correlation of annihilation radiation (ACAR). Thespectra were compared with theoretical results obtained within LDA+DMFT, acombination of the local density approximation (LDA) and the many-bodydynamical mean-field theory (DMFT). The self-energy describing the electroniccorrelations in Ni is found to make important anisotropic contributions to themomentum distribution which are not present in LDA. Based on a detailedcomparison of the theoretical and experimental results the strength of thelocal electronic interaction U in ferromagnetic Ni is determined as 2.0 +- 0.1eV.

Electron-electron interaction strength in ferromagnetic nickel determined by spin-polarized positron annihilation