Trials for the cosmological ⁷Li problem with ⁷Be beams at CRIB and collaborating studies

For many years, the cosmological ⁷Li problem has been tackled from various aspects. The nuclear reaction data have also been improved, but still there remains some ambiguities. We review our experimental plans to measure the cross sections of three key reactions which act to destroy ⁷Be during the Big-Bang Nucleosynthesis (BBN). These experiments are all based on ⁷Be beams produced at Center-for-Nuclear-Study Radioactive Ion Beam separator (CRIB) in collaborations mainly with research groups from INFN-LNS and RCNP. The preliminary result of the previous experiment and the future plan are discussed