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, sa.4, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 85 Sayı: 4
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1103/physrevc.85.044602
  • Dergi Adı: PHYSICAL REVIEW C
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Akdeniz Üniversitesi Adresli: Evet

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.