OBSERVATION METHOD OF SOLAR NEUTRINO BY CAPACITOR TYPE HEAVY HYDROGEN ION BEAM SOURCE

摘要

PROBLEM TO BE SOLVED: To provide an easy and efficient measurement means of solar neutrino.;SOLUTION: This observation method comprises the followings. (1) A capacitor is formed by putting two metal plates in a vacuum vessel with an insulating film and a paper impregnated with heavy water in between and charged. A small hole is opened in the paper-side metal plate taken as negative electrode to draw heavy hydrogen positive ion D⁺ beam. (2) A magnetic field type mass analyzer is arranged in the rear of the D⁺ beam. (3) The back side (a positive electrode opposite to the beam) of the capacitor is set toward the solar direction, and mass analysis is performed while changing charging voltage. Namely, solar neutrino ν_e is not received by a low-energy nondirectional liquid as in the past but by the directional positive ion D⁺ beam of heavy hydrogen having high energy. At this time, the direction of ν_e is matched to that of the D⁺ beam, and ν_e is accelerated so that the momentum of D⁺ is larger than that of e^-, and detected at a current density of e^- close to the logic flow rate (to 10¹¹ piece/cm²sec) of ν_e, not by a conventional detection with extremely low probability (to 1 piece/day). Namely, ν_e is converted to e^- nearly 100%. To easily generate the D⁺ beam at low cost and facilitate the matching with the solar direction, a heavy hydrogen molar polarization type plane capacitor using heavy water is realized.;COPYRIGHT: (C)2004,JPO