The cosmological lithium problem (CLP) stems from the outstanding discrepancy between theoretical predictions and astronomical observations of primordial lithium abundances. For the radiogenic production of Li-7, Be-7 plays a pivotal role in the Big Bang nucleosynthesis (BBN). Nevertheless, the data for neutron-induced Be-7 destruction processes were still sparse, and especially lacked information on the contributions of transitions to the Li-7 excited states. In this work, we have determined the Be-7 (n,p(0))(7) Li, Be-7 (n,p(1))(7) Li*, and Be-7 (n,alpha)(4) R-matrix fit, providing an improved uncertainty evaluation of the (n,p(0)) (n,p(1)) (n,p(0)) (n,p(1)) PRIMAT. As a consequence, the present nuclear-physics data offers a reduction of the predicted Li-7 abundance by about one-tenth, which would impose a stricter constraint on BBN and head us in the correct direction to the CLP solution.

Constraining the Primordial Lithium Abundance: New Cross Section Measurement of the 7Be + n Reactions Updates the Total 7Be Destruction Rate

Hayakawa, S.;La Cognata, M.;Lamia, L.;Cherubini, S.;Figuera, P.;Lattuada, M.;Palmerini, S.;Rapisarda, G. G.;Romano, S.;
2021-01-01

Abstract

The cosmological lithium problem (CLP) stems from the outstanding discrepancy between theoretical predictions and astronomical observations of primordial lithium abundances. For the radiogenic production of Li-7, Be-7 plays a pivotal role in the Big Bang nucleosynthesis (BBN). Nevertheless, the data for neutron-induced Be-7 destruction processes were still sparse, and especially lacked information on the contributions of transitions to the Li-7 excited states. In this work, we have determined the Be-7 (n,p(0))(7) Li, Be-7 (n,p(1))(7) Li*, and Be-7 (n,alpha)(4) R-matrix fit, providing an improved uncertainty evaluation of the (n,p(0)) (n,p(1)) (n,p(0)) (n,p(1)) PRIMAT. As a consequence, the present nuclear-physics data offers a reduction of the predicted Li-7 abundance by about one-tenth, which would impose a stricter constraint on BBN and head us in the correct direction to the CLP solution.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/510011
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