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,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.. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 102:5(2020). [10.1103/PhysRevC.102.052802]

Underground experimental study finds no evidence of low-energy resonance in the Li 6 (p,γ) Be 7 reaction

Best A.;Di Leva A.;Guglielmetti A.;Imbriani G.;Straniero O.;
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.
2020
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.. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 102:5(2020). [10.1103/PhysRevC.102.052802]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/827427
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