The neutrino floor at ultra-low threshold
  By lowering their energy threshold direct dark matter searches can reach the
neutrino floor with experimental technology now in development. The 7Be flux
can be detected with $\sim 10$ eV nuclear recoil energy threshold and 50 kg-yr
exposure. The pep flux can be detected with $\sim 3$ ton-yr exposure, and the
first detection of the CNO flux is possible with similar exposure. The pp flux
can be detected with threshold of $\sim$ eV and only $\sim$ kg-yr exposure.
These can be the first pure neutral current measurements of the low-energy
solar neutrino flux. Measuring this flux is important for low mass dark matter
searches and for understanding the solar interior.
