1. Three-body vs. dineutron approach to two-neutron radiative capture in 6He
- Author
-
L. V. Grigorenko, N. B. Shulgina, and Mikhail V. Zhukov
- Subjects
Physics ,Nuclear and High Energy Physics ,Nuclear Theory ,Basis (linear algebra) ,010308 nuclear & particles physics ,Strength function ,Radiative capture ,Three-body hyperspherical harmonics method ,Extrapolation ,Neutron halo ,FOS: Physical sciences ,01 natural sciences ,lcsh:QC1-999 ,Dipole excitation ,Two-neutron nonresonant radiative capture reaction ,Nuclear Theory (nucl-th) ,Dynamical dineutron model ,0103 physical sciences ,Soft dipole mode ,Neutron ,Atomic physics ,010306 general physics ,Nuclear theory ,lcsh:Physics - Abstract
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 $\alpha$+$n$+$n \rightarrow ^6$He+$\gamma$ is calculated. Comparison with the previous calculations is performed., Comment: 6 pages, 9 figures
- Published
- 2020