Experimental status of 7Be production and destruction at astrophysical relevant energies

The production and destruction of 7Be plays a significant role in the Big Bang Nucleosynthesis as well as in the framework of the solar neutrino. The 3He(α, γ)7Be reaction cross sections has been measured several times in the last decades, but the precision achieved on reaction rate determinations at the relevant astrophysical energies is not yet satisfactory. The experimental status of this reaction will be critically reviewed, and the theoretical descriptions available will be discussed

Produção de semente genética de soja na Embrapa Trigo em 2013/2014.

bitstream/item/114973/1/2014-Documentos-online-151-p25.pd

Melhoramento de soja para alimentação humana na Embrapa Trigo - safra agrícola 2013/2014.

bitstream/item/114971/1/2014-Documentos-online-151-p21.pd

Arranjo de plantas em trigo: atualização visando aumento no rendimento de grãos.

Orientador: João Leonardo Fernandes Pires

Study of the 12C+12C fusion reactions near the Gamow energy

The fusion reactions 12C(12C,a)20Ne and 12C(12C,p)23Na have been studied from E = 2.10 to 4.75 MeV by gamma-ray spectroscopy using a C target with ultra-low hydrogen contamination. The deduced astrophysical S(E)* factor exhibits new resonances at E <= 3.0 MeV, in particular a strong resonance at E = 2.14 MeV, which lies at the high-energy tail of the Gamow peak. The resonance increases the present non-resonant reaction rate of the alpha channel by a factor of 5 near T = 8x10^8 K. Due to the resonance structure, extrapolation to the Gamow energy E_G = 1.5 MeV is quite uncertain. An experimental approach based on an underground accelerator placed in a salt mine in combination with a high efficiency detection setup could provide data over the full E_G energy range.Comment: 4 Pages, 4 figures, accepted for publication in Phys. Rev. Let

BRS 5601RR.

bitstream/item/140616/1/ID43597-FD389BRS5601RR.pd

Produção de semente genética de soja na Embrapa Trigo em 2014/2015.

bitstream/item/141071/1/ID43632-2015PLDocOnline155sojaresultadosp30.pd