Three-body vs. dineutron approach to two-neutron radiative capture in $^{6}$He

The low-energy behavior of the strength function for the $1^-$ soft dipole excitation in $^{6}$He is studied theoretically. Use of very large basis sizes and well-grounded extrapolation procedures allows to move to energies as small as 1 keV, at which the low-energy asymptotic behavior of the E1 strength function seems to be achieved. It is found that the low-energy behavior of the strength function is well described in the effective three-body "dynamical dineutron model". The astrophysical rate for the $α$+$n$+$n \rightarrow ^6$He+$γ$ is calculated. Comparison with the previous calculations is performed.

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