Production of A = 6 , 7 nuclides in the α + α reaction and cosmic ray nucleosynthesis
2001; American Institute of Physics; Volume: 63; Issue: 6 Linguagem: Inglês
10.1103/physrevc.63.065805
ISSN1538-4497
AutoresD. J. Mercer, Sam M. Austin, J. Brown, Stephen Danczyk, S. E. Hirzebruch, J. H. Kelley, T. Suomijärvi, D. A. Roberts, Terry P. Walker,
Tópico(s)Boron Compounds in Chemistry
ResumoCross sections for production of ${}^{6}\mathrm{He},$ ${}^{6}\mathrm{Li},$ ${}^{7}\mathrm{Li},$ and ${}^{7}\mathrm{Be}$ in the $\ensuremath{\alpha}+\ensuremath{\alpha}$ reaction were measured at bombarding energies of 159.3, 279.6, and 619.8 MeV and are found to decrease rapidly with increasing energy. These cross sections are essential for the calculation of the rate of nucleosynthesis of the lithium isotopes in the cosmic rays and thereby play a key role in our understanding of the synthesis of Li, Be, and B. The results for ${}^{6}\mathrm{Li}$ differ significantly from the tabulated values commonly used in cosmic ray production calculations and lead to lower production of ${}^{6}\mathrm{Li}.$
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