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Richardson-Gaudin Configuration-Interaction for nuclear pairing correlations
Stijn De Baerdemacker, Pieter W. Claeys, Jean-Sébastien Caux +2
Background: The nuclear many-body system is a strongly correlated quantum system, posing serious challenges for perturbative approaches starting from uncorrelated reference states.…
Probing pairing correlations in Sn isotopes using Richardson-Gaudin integrability
Stijn De Baerdemacker, Veerle Hellemans, Rianne van den Berg +5
Pairing correlations in the even-even A=102-130 Sn isotopes are discussed, based on the Richardson-Gaudin variables in an exact Woods-Saxon plus reduced BCS pairing framework. The…
Richardson-Gaudin integrability in the contraction limit of the quasispin
Stijn De Baerdemacker
Background: The reduced, level-independent, Bardeen-Cooper-Schrieffer Hamiltonian is exactly diagonalizable by means of a Bethe Ansatz wavefunction, provided the free variables in…
The Tamm-Dancoff Approximation as the boson limit of the Richardson-Gaudin equations for pairing
Stijn De Baerdemacker
A connection is made between the exact eigen states of the BCS Hamiltonian and the predictions made by the Tamm-Dancoff Approximation. This connection is made by means of a paramet…
Spectral properties of a tractable collective Hamiltonian
S. De Baerdemacker, K. Heyde, V. Hellemans
The spectral properties of a tractable collective model Hamiltonian are studied. The potential energy is truncated up to quartic terms in the quadrupole deformation variables, inco…
Configuration mixing in the neutron-deficient Pb isotopes
V. Hellemans, S. De Baerdemacker, K. Heyde
In this article we report the results of detailed interacting boson model calculations with configuration mixing for the neutron-deficient Pb isotopes. Calculated energy levels and…