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Abundance of Ground States with Positive Parity
T. Papenbrock, H. A. Weidenmueller
We investigate analytically and numerically a random-matrix model for m fermions occupying l1 single-particle states with positive parity and l2 single-particle states with negativ…
Medium-mass nuclei from chiral nucleon-nucleon interactions
G. Hagen, T. Papenbrock, D. J. Dean +1
We compute the binding energies, radii, and densities for selected medium-mass nuclei within coupled-cluster theory and employ the "bare" chiral nucleon-nucleon interaction at orde…
Benchmark calculations for 3H, 4He, 16O and 40Ca with ab-initio coupled-cluster theory
G. Hagen, D. J. Dean, M. Hjorth-Jensen +2
We present ab-initio calculations for 3H, 4He, 16O, and 40Ca based on two-nucleon low-momentum interactions Vlowk within coupled-cluster theory. For 3H and 4He, our results are wit…
Coupled-cluster theory for three-body Hamiltonians
G. Hagen, T. Papenbrock, D. J. Dean +4
We derive coupled-cluster equations for three-body Hamiltonians. The equations for the one- and two-body cluster amplitudes are presented in a factorized form that leads to an effi…
Random Matrices and Chaos in Nuclear Spectra
T. Papenbrock, H. A. Weidenmueller
We speak of chaos in quantum systems if the statistical properties of the eigenvalue spectrum coincide with predictions of random-matrix theory. Chaos is a typical feature of atomi…
The Two-Body Random Ensemble in Nuclei
T. Papenbrock, H. A. Weidenmueller
Combining analytical and numerical methods, we investigate properties of the two-body random ensemble (TBRE). We compare the TBRE with the Gaussian orthogonal ensemble of random ma…