Underground experimental study finds no evidence of low-energy resonance in the Li 6 (p,γ) Be 7 reaction
- Piatti D.
- Chillery T.
- Depalo R.
- Aliotta M.
- Bemmerer D.
- Best A.
- Boeltzig A.
- Broggini C.
- Bruno C. G.
- Caciolli A.
- Cavanna F.
- Ciani G. F.
- Corvisiero P.
- Csedreki L.
- Davinson T.
- Di Leva A.
- Elekes Z.
- Ferraro F.
- Fiore E. M.
- Formicola A.
- Fulop Zs.
- Gervino G.
- Gnech A.
- Guglielmetti A.
- Gustavino C.
- Gyurky Gy.
- Imbriani G.
- Junker M.
- Kochanek I.
- Lugaro M.
- Marcucci L. E.
- Marigo P.
- Masha E.
- Menegazzo R.
- Mossa V.
- Pantaleo F. R.
- Paticchio V.
- Perrino R.
- Prati P.
- Schiavulli L.
- Stockel K.
- Straniero O.
- Szucs T.
- Takacs M. P.
- Zavatarelli S.
DOIAbstract
The astrophysical Li6(p,γ)Be7 reaction occurs during Big Bang nucleosynthesis and the pre-main sequence and main sequence phases of stellar evolution. The low-energy trend of its cross section remains uncertain, since different measurements have provided conflicting results. A recent experiment reported a resonancelike structure at center-of-mass energy 195 keV, associated to a positive-parity state of Be7. The existence of such resonance is still a matter of debate. We report a new measurement of the Li6(p,γ)Be7 cross section performed at the Laboratory for Underground Nuclear Astrophysics, covering the center-of-mass energy range E=60-350 keV. Our results rule out the existence of low-energy resonances. The astrophysical S-factor varies s...
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