Abstract
The properties of matter-induced neutrino decay with majoron emission are analysed in some details for the cases of Majorana, ZKM and Dirac neutrinos. The result of such a decay of solarve's in the sun interior could be the appearance of\(\bar \nu _e \) flux. Assuming that the neutrinos have only standard weak interactions, the solar\(\bar \nu _e \) flux can be at the border of detectability for the future large volume detectors like Borex or Super-Kamiokande. However, the\(\bar \nu _e \) signal can be considerably larger, provided the neutrinos have new non-standard interactions with matter.
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