Abstract
Until now we always considered a sharp Fermi level with a very particular distribution of level occupation probabilities. Up to the Fermi level, all levels are fully occupied, while above, all are unoccupied. This conforms with a Hartree-Fock static ground state with 1p – 1h, 2p – 2h, … excitations as elementary modes of excitation (see Sect. 6.2 for a discussion on the TDA approximation). A short range force of sufficient strength is now able to scatter couples of particles across the sharp Fermi level. For nuclei at or near doubly-closed shell configurations, this leads to a “diffuse” ground state with 2p – 2h, 4p – 4h,… correlations, much like the RPA ground state \(\left| {\tilde{0}} \right\rangle\) as discussed in Sect. 6.3. When, however, many nucleons outside closed shells are present, this pair can scatter, under certain conditions, lead to a stable, smooth probability distribution for the occupation of the single-particle orbitals. So, the pairing correlations set in and modify the nuclear ground state distribution of nucleons in nuclei in a major way (see Fig. 7.1).
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 1994 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Heyde, K.L.G. (1994). Pairing Correlations: Particle-Particle Excitations in Open-Shell Nuclei. In: The Nuclear Shell Model. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79052-2_8
Download citation
DOI: https://doi.org/10.1007/978-3-642-79052-2_8
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-79054-6
Online ISBN: 978-3-642-79052-2
eBook Packages: Springer Book Archive