Speaker
Dr
Massimo Barbagallo
(INFN sezione di Bari)
Description
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{\small \it Nuclear Physics in Astrophysics 8, NPA8: 18-23 June 2017, Catania, Italy}
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\TITLE{Cosmological Lithium Problem: Measurement of the $^7$Be(n,$\alpha$) and $^7$Be(n,p) cross sections at the n\_TOF facility at CERN }\\[3mm]
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\AUTHORS{M. Barbagallo$^{1,2}$, on behalf of the n\_TOF Collaboration$^2$}
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{\small \it
\AFFILIATION{1}{INFN, Sezione di Bari, Via E. Orabona n. 4, 70125, Bari, Italy}
\AFFILIATION{2}{Conseil Européen pour la Recherche Nucléaire, CERN}
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\centerline{Contact email: {\it massimo.barbagallo@cern.ch}}
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The Cosmological Lithium Problem refers to the large discrepancy between the abundance of primordial $^7$Li predicted by the standard theory of Big Bang Nucleosynthesis and the value observed in low metallicity halo stars,
in the so-called âSpite plateauâ. A possible explanation for this longstanding puzzle in Nuclear Astrophysics is related to the incorrect estimation of the destruction rate of $^7$Be, which is responsible for the production
of 95\% of primordial Lithium. While charged-particle induced reactions have mostly been ruled out, data on the $^7$Be(n,$\alpha$) and $^7$Be(n,p) direct reactions have been so far scarce or completely missing, so that a large
uncertainty still affects the abundance of $^7$Li predicted by the standard theory of Big Bang Nucleosynthesis.
Both reactions have been recently measured at the second experimental area of the n\_TOF facility at CERN, taking advantage of the very high instantaneous neutron flux of this new installation. Data in a wide neutron energy range,
i.e. 10 meV-10 keV for (n,$\alpha$) and 20 meV-300 keV for (n,p), have been obtained for both reactions, with different setups based on silicon detectors. For the (n,p) reaction, an isotopically separated target was obtained by
implantation of a $^7$Be beam produced at ISOLDE demonstrating, also for the first time, the feasibility of neutron measurements on isotopes produced at Radioactive Beam Facilities.
The results of the measurements will be here reported.
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Primary author
Dr
Massimo Barbagallo
(INFN sezione di Bari)
