Jaume Carbonell, Emiko Hiyama, Rimantas Lazauskas, F. Miguel Marqués
SciPost Phys. Proc. 3, 008 (2020) ·
published 24 February 2020
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We consider the evolution of the neutron-nucleus scattering length for the lightest nuclei. We show that, when increasing the number of neutrons in the target nucleus, the strong Pauli repulsion is weakened and the balance with the attractive nucleon-nucleon interaction results into a resonant virtual state in $^{18}$B. We describe $^{19}$B in terms of a $^{17}$B-$n$-$n$ three-body system where the two-body subsystems $^{17}$B-$n$ and $n$-$n$ are unbound (virtual) states close to the unitary limit. The energy of $^{19}$B ground state is well reproduced and two low-lying resonances are predicted. Their eventual link with the Efimov physics is discussed. This model can be extended to describe the recently discovered resonant states in $^{20,21}$B.
Prof. Carbonell: "Many thanks for your very usef..."
in Submissions | report on Low-energy neutron scattering on light nuclei and 19B as a 17B-n-n three-body system in the unitary limit