Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 76: Struktur und Dynamik von Kernen

HK 76.1: Gruppenbericht

Donnerstag, 7. März 2013, 16:45–17:15, HSZ-301

Short-range correlations studied with unitarily transformed interactions and operators — •Thomas Neff, Hans Feldmeier, and Dennis Weber — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany

Short-range correlations in light nuclei are investigated using the Argonne V18 and the chiral N3LO interactions. Unitary transformations in the similarity renormalization group (SRG) approach are used to obtain effective interactions which allow to obtain converged wave functions within the no-core shell model. For a consistent description the SRG transformation has to be applied also to observables. This is especially important for observables that are sensitive to short-range or high-momentum physics. A prime example are two-body densities that reflect the short-range correlations inside the nucleus.

We find for each interaction a universal behaviour of the two-body density at small nucleon distances and for high relative momenta. The momentum distributions above the Fermi momentum are dominated by tensor forces. At intermediate momenta the two-body densities are sensitive to three-body correlations that vary with the SRG flow parameter. This dependence is minimized for nucleon pairs with vanishing center-of-mass momentum.

[1] H. Feldmeier, W. Horiuchi, T. Neff, and Y. Suzuki, Phys. Rev. C 84, 054003 (2011)
T. Neff, H. Feldmeier, D. Weber, in preparation