Energy Spectrum of Neutron-Rich Helium Isotopes: Complex Made Simple
Abstract
We demonstrate that the intricate energy spectrum of neutron-rich helium isotopes can be straightforwardly described by taking advantage of the low-energy properties of neutron-neutron interaction and the scale separation that is present in diluted dripline systems. By using arguments based on the halo effective field theory, we carry out a parameter reduction of the complex-energy configuration interaction framework in the space, including resonant and scattering states. By adjusting only one parameter, the strength of the spin-singlet central neutron-neutron interaction, we reproduce experimental energies and widths of He within tens of keV precision. We predict a parity inversion of narrow resonances in He and show that the ground state of He is an -wave-dominated threshold configuration that could decay through two-neutron emission.
Keywords
Cite
@article{arxiv.1806.02936,
title = {Energy Spectrum of Neutron-Rich Helium Isotopes: Complex Made Simple},
author = {K. Fossez and J. Rotureau and W. Nazarewicz},
journal= {arXiv preprint arXiv:1806.02936},
year = {2020}
}