$\delta$-pairing forces and collective pairing vibrations

@article{Sieja2003deltapairingFA,
  title={\$\delta\$-pairing forces and collective pairing vibrations},
  author={K. Sieja and Andrzej Baran and Krzysztof Pomorski},
  journal={The European Physical Journal A - Hadrons and Nuclei},
  year={2003},
  volume={20},
  pages={413-418}
}
Abstract.The collective pairing Hamiltonian is obtained in the framework of the generator coordinate method in the Gaussian overlap approximation with a slightly modified BCS function used as a generator function. The collective variable $\alpha$, measuring the monopole moment of the pairing field, and the gauge transformation angle $\phi$ are chosen as generator coordinates. The vibrational ground states are calculated by diagonalisation of the collective pairing Hamiltonian in the harmonic… 
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