Three-body vs. dineutron approach to two-neutron radiative capture in 6He
Abstract
The low-energy behavior of the strength function for the 1- soft dipole excitation in 6He 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→6He+γ is calculated. Comparison with the previous calculations is performed.
- Publication:
-
Physics Letters B
- Pub Date:
- August 2020
- DOI:
- 10.1016/j.physletb.2020.135557
- arXiv:
- arXiv:2003.12374
- Bibcode:
- 2020PhLB..80735557G
- Keywords:
-
- Two-neutron nonresonant radiative capture reaction;
- Soft dipole mode;
- Neutron halo;
- Three-body hyperspherical harmonics method;
- Dynamical dineutron model;
- Nuclear Theory
- E-Print:
- 6 pages, 9 figures