Abstract
We analyze the role of maximally aligned isoscalar pairs in heavy nuclei by employing a formalism of quartets. Quartets are superpositions of two neutrons and two protons coupled to total isospin and given . The study is focused on the contribution of spin-aligned pairs carrying the angular momentum to the structure of and . We show that the role played by the pairs is quite sensitive to the model space and, in particular, it decreases considerably by passing from the simple space to the more complete space. In the latter case the description of these nuclei in terms of only spin-aligned pairs turns out to be unsatisfactory while an important contribution, particularly in the ground state, is seen to arise from isovector and isoscalar pairs. Thus, contrary to previous studies, we find no compelling evidence of a spin-aligned pairing phase in .
- Received 14 May 2015
DOI:https://doi.org/10.1103/PhysRevC.91.064318
©2015 American Physical Society