Neutron Interactions With $^{7}$Be and the Primordial $^{7}$Li Problem

We study the interaction of neutrons with $^{7}$Be to estimate the direct destruction of $^{7}$Be during BBN; i.e. the predicted primordial $^{7}$Li. We plan to use a $^{7}$Be target (15 GBq) prepared by electro-deposition at PSI. The intense neutron flux of up to 5x10$^{10}$ n/sec/cm$^{2}$ are produced with proton beams and a high power liquid-lithium target (LiLiT) from the SARAF (phase I) facility in Israel. The outgoing particles will be measured using CR-39 plates that were tested to be insensitive to the large neutron flux and were calibrated with protons and alpha-particles from the TUNL. In a separate stage implanted $^{7}$Be target will be prepared at the ISOLDE facility of CERN. The results of the calibration of the CR-39 plates and the test experiment at SARAF with $^{10}$B target as well as a very low activity $^{7}$Be test target prepared at PSI, will be presented.