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 smoothly with energy, in agreement with theoretical models.
Underground experimental study finds no evidence of low-energy resonance in the Li-6(p, gamma) Be-7 reaction [Underground experimental study finds no evidence of low-energy resonance in the Li 6 (p,γ) Be 7 reaction] / D. Piatti, T. Chillery, R. Depalo, M. Aliotta, D. Bemmerer, A. Best, A. Boeltzig, C. Broggini, C.G. Bruno, A. Caciolli, F. Cavanna, G.F. Ciani, P. Corvisiero, L. Csedreki, T. Davinson, A. Di Leva, Z. Elekes, F. Ferraro, E.M. Fiore, A. Formicola, Z. Fulop, G. Gervino, A. Gnech, A. Guglielmetti, C. Gustavino, G. Gyurky, G. Imbriani, M. Junker, I. Kochanek, M. Lugaro, L.E. Marcucci, P. Marigo, E. Masha, R. Menegazzo, V. Mossa, F.R. Pantaleo, V. Paticchio, R. Perrino, P. Prati, L. Schiavulli, K. Stockel, O. Straniero, T. Szucs, M.P. Takacs, S. Zavatarelli. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 102:5(2020 Nov 10), pp. 052802.052802-1-052802.052802-6. [10.1103/PhysRevC.102.052802]
Underground experimental study finds no evidence of low-energy resonance in the Li-6(p, gamma) Be-7 reaction [Underground experimental study finds no evidence of low-energy resonance in the Li 6 (p,γ) Be 7 reaction]
R. Depalo
;F. Ferraro;A. Guglielmetti;E. Masha;
2020
Abstract
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 smoothly with energy, in agreement with theoretical models.
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