ملخص: The seasonal effect on solar neutrino flux is studied. Two generations of Majorana neutrino are considered. Because of the inclination of the solar axis to the ecliptic plane by an angle of +- 7° 15' and considering the toroidal structure of the solar magnetic field in the convective zone, neutrinos crossing the sun through the equatorial plane or through regions of higher latitude, should present different amount of suppression. Indeed neutrino going through the equatorial plane were the magnetic fiels is thought to be zero, are not suspected to suffer amplitude of the magnetic field are. However, the solar magnetic field structure is far from being well understood. One is led to consider different magnetic field configuration. A latitude dependence is also needed. To overcome such difficulty, we consider that the convective zone magnetic field is scaled by a parameter B0. Hence, varying B0 is supposed to represent a latitude dependence of the magnetic field. After a statistical analysis of the available data from Homestake and Gallex experiments, limits on the difference between the mass eigenstates and the neutrino transitional magnetic moment.

طبعة: Blida: Université de Blida
لغة: إنجليزية
الوصف المادي: 72 p. ill. ;30 cm
الشهادة: Magister
مؤسسة مناقشة الرسالة: Institut des Sciences Exactes

ملاحظة: Annexe pp.68-72; Bibliogr.pp.[1-2]