136 research outputs found
The 7Li(n,gamma)8Li Radiative Capture at Astrophysical Energies
The variants of intercluster interaction potentials were constructed for
description of the resonance nature of some phase shifts of the n7Li elastic
scattering at low energies and the P2 ground state of 8Li in the n7Li cluster
channel. The possibility of describing the total cross sections of 7Li(n,g)8Li
in the region from 5 meV (5 10-3 eV) to 1 MeV including resonance at 0.25 MeV
was shown with the potentials obtained in the potential cluster model taking
into account forbidden states.Comment: 18 p., 5 fig., 72 re
Examination of the astrophysical S-factors of the radiative proton capture on 2H, 6Li, 7Li, 12C and 13C
Astrophysical S-factors of radiative capture reactions on light nuclei have
been calculated in a two-cluster potential model, taking into account the
separation of orbital states by the use of Young schemes. The local two-body
potentials describing the interaction of the clusters were determined by
fitting scattering data and properties of bound states. The many-body character
of the problem is approximatively accounted for by Pauli forbidden states. An
important feature of the approach is the consideration of the dependence of the
interaction potential between the clusters on the orbital Young schemes, which
determine the permutation symmetry of the nucleon system. Proton capture on 2H,
6Li, 7Li, 12C, and 13C was analyzed in this approach. Experimental data at low
energies were described reasonably well when the phase shifts for
cluster-cluster scattering, extracted from precise data, were used. This shows
that decreasing the experimental error on differential elastic scattering cross
sections of light nuclei at astrophysical energies is very important also to
allow a more accurate phase shift analysis. A future increase in precision will
allow more definite conclusions regarding the reaction mechanisms and
astrophysical conditions of thermonuclear reactions.Comment: 40p., 9 fig., 83 ref. arXiv admin note: substantial text overlap with
arXiv:1005.1794, arXiv:1112.1760, arXiv:1005.198
- …