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 $spd$ 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 ${}^{5-8}$He within tens of keV precision. We predict a parity inversion of narrow resonances in ${}^9$He and show that the ground state of ${}^{10}$He is an $s$-wave-dominated threshold configuration that could decay through two-neutron emission.

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Cited by in corpus (17)

• A Guided Tour of Ab Initio Nuclear Many-Body Theory
• Non-Empirical Interactions for the Nuclear Shell Model: An Update
• Local nucleon-nucleon and three-nucleon interactions within chiral effective field theory
• Gamow Shell Model description of Li isotopes and their mirror partners
• Density matrix renormalization group description of the island of inversion isotopes ${}^{28-33}$F
• SS-HORSE Extension of the No-Core Shell Model: Application to Resonances in ${}^7\mathrm{H}e$
• Merging ab initio theory and few-body approach for $(d,p)$ reactions
• Towards scalable bound-to-resonance extrapolations for few- and many-body systems
• Multi-neutron transfer in ${}^8$He induced reactions near the Coulomb barrier
• Dineutron-dineutron correlation in ${}^8$He
• Perspectives on few-body cluster structures in exotic nuclei
• A Vision for the Science of Rare Isotopes
• Local two- and three-nucleon chiral interactions
• Complex-energy eigenvector continuation for nuclear many-body broad resonances
• Coupled-cluster computations of optical potential for medium-mass nuclei
• Direct observation of three-neutron emission from ${}^7$He${}^{\ast }$ and the search for the trineutron
• Two particles interacting via a contact interaction on $S^2$