A POSSIBLE GAS FOR SOLAR-NEUTRINO SPECTROSCOPY

We discuss the possibility of using pure CF4 to fill a 2000 m(3) Time Projection Chamber in order to detect the solar neutrinos through the elastic scattering nu(e) + e(-) --> nu(e) + e(-), with the threshold o f 100 keV on the kinetic energy of the recoiling electron. In a volume of 2000 m(3) of CF4 at normal pressure and room temperature, which co rresponds to a mass of 7.4 ton, we expect similar to 3300 of such even ts per year. The detector can give the spectrum of the low energy neut rinos from the Sun and it can identify solar neutrinos of different or igin: pp, Be-7, and, eventually, B-8. We find that C-14 is a possible severe source of background: it is necessary to have a ratio C-14/C-12 lower than 10(-19) in order to be able to identify the pp neutrinos.