The $^{7}$Be(n,p)$^{7}$Li reaction and the Cosmological Lithium Problem:
  measurement of the cross section in a wide energy range at n_TOF (CERN)
  We report on the measurement of the $^{7}$Be($n, p$)$^{7}$Li cross section
from thermal to approximately 325 keV neutron energy, performed in the
high-flux experimental area (EAR2) of the n_TOF facility at CERN. This reaction
plays a key role in the lithium yield of the Big Bang Nucleosynthesis (BBN) for
standard cosmology. The only two previous time-of-flight measurements performed
on this reaction did not cover the energy window of interest for BBN, and
showed a large discrepancy between each other. The measurement was performed
with a Si-telescope, and a high-purity sample produced by implantation of a
$^{7}$Be ion beam at the ISOLDE facility at CERN. While a significantly higher
cross section is found at low-energy, relative to current evaluations, in the
region of BBN interest the present results are consistent with the values
inferred from the time-reversal $^{7}$Li($p, n$)$^{7}$Be reaction, thus
yielding only a relatively minor improvement on the so-called Cosmological
Lithium Problem (CLiP). The relevance of these results on the near-threshold
neutron production in the p+$^{7}$Li reaction is also discussed.
