Influence of long-range effects on low-energy cross sections of He and HeX: The lithium problem


Dapo H., BOZTOSUN İ., KOÇAK G. , Balantekin A. B.

PHYSICAL REVIEW C, cilt.85, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

Özet

In this paper, we study the connection between the interaction and the low energy observables, in particular the cross section for He and HeX, the helium nucleus with a heavier particle attached, to explain problems with the observed lithium abundance in the big-bang nucleosynthesis. We treat the processes He-4 + H-2 -> Li-6 + gamma and (HeX-)-He-4 + H-2 -> Li-6 + X- and primarily focus on the effects of the long-range part of the total potential on the cross section. Our results indicate that relatively small changes in the long-range part of the potential can have a profound affect. Additionally, we compare the relative impacts on the low energy cross section of the Coulomb barrier peak and the long-range part of the interaction. Our results confirm that the long-range potential dominantly influences the low energy observables.
In this paper, we study the connection between the interaction and the low energy observables, in particular
the cross section for He and HeX, the helium nucleus with a heavier particle attached, to explain problems with
the observed lithium abundance in the big-bang nucleosynthesis. We treat the processes 4He + 2H → 6Li + γ
and 4HeX− + 2H → 6Li + X− and primarily focus on the effects of the long-range part of the total potential on
the cross section. Our results indicate that relatively small changes in the long-range part of the potential can
have a profound affect. Additionally, we compare the relative impacts on the low energy cross section of the
Coulomb barrier peak and the long-range part of the interaction. Our results confirm that the long-range potential
dominantly influences the low energy observables.