Abstract
In order to study the nucleon-nucleon pairing effects in clustering nuclei, we formulate a superposed Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave function, which includes both molecular-orbit and pairing configurations explicitly. With this new wave function, we investigate the anomalous deuteronlike -pairing effect in with and (isoscalar) by comparing with isovector pairs in and . Energies are calculated for the ground states of and nuclei, and the excited state of . These energies are essentially improved comparing with studies using a previous version of THSR wave function. Furthermore, overlaps between the total wave function and the pairing component indicate that the pairing effect is more visible in than in and . By analyzing the energies and the overlaps between wave function components, we observe two different mechanisms enhancing the formation of deuteronlike pairs in . We also discuss the pairing effect by showing average distances between components in each nucleus and density distributions of valence nucleons.
- Received 10 October 2018
- Revised 25 February 2019
DOI:https://doi.org/10.1103/PhysRevC.100.014306
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