Ab initio single-neutron spectroscopic overlaps in lithium isotopes

We calculate single-neutron spectroscopic overlaps for lithium isotopes in the framework of the ab initio symmetry-adapted no-core shell model. We report the associated neutron-nucleus asymptotic normalization coefficients (ANCs) and spectroscopic factors (SFs) that are important ingredients in many reaction crosssection calculations. While spectroscopic factors have been traditionally extracted from experimental cross sections, their sensitivity on the type of reactions, the energy, and the underlying models point to the need for determining SFs from first-principle structure considerations. As illustrative examples, we present 6Li +n, 7Li+n, and 8Li +n, and we show that the results are in a good agreement with those of other ab initio methods, where available, including the quantum Monte Carlo approach. We compare ANCs and SFs to available experimentally deduced values, with a view toward expanding this study to heavier nuclei and to extracting intercluster effective interactions for input into analyses of existing and future experimental data.

Automated summary

In this study, we calculate single-neutron spectroscopic overlaps for lithium isotopes using the ab initio symmetry-adapted no-core shell model. We present the associated neutron-nucleus asymptotic normalization coefficients (ANCs) and spectroscopic factors (SFs), which are crucial for reaction cross-section calculations. The results show that SFs extracted from first-principle structure considerations can provide good agreement with experimental cross sections, highlighting the importance of these structure-based factors.