High precision studies of soft dipole mode in two-neutron halo nuclei: $^{6}$He case

Understand

The "soft dipole" E1 strength function is calculated for the transition from the $^{6}$He $0^+$ ground state to the $1^-$ continuum $^{4}$He+$n$+$n$.

• The calculations were performed within the hyperspherical harmonics formalism.
• The sensitivity of the results to the $^{6}$He ground state structure and to final state interactions, are analyzed.
• The large-basis calculations show the reliably converged results for soft dipole strength function and for momentum correlations of the $^{6}\mbox{He} \rightarrow \, ^{4}$He+$n$+$n$ dissociation products.