Risultati di ricerca
6 giorni fa · This resolved the solar neutrino problem: the electron neutrinos produced in the Sun had partly changed into other flavors which the experiments could not detect. Although individual experiments, such as the set of solar neutrino experiments, are consistent with non-oscillatory mechanisms of neutrino flavor conversion, taken ...
6 giorni fa · Solar neutrino problem (1968 –2001): Solved by a new understanding of neutrino physics, requiring a modification of the Standard Model of particle physics—specifically, neutrino oscillation. Saturn's core spin was determined from its gravitational field. Nuclear physics
21 mag 2024 · The only problem with the results found in this experiment was that it detected only about one third of the solar neutrinos that theoretical models predicted. Scientists around the world then built other neutrino detectors: Kamiokande in Japan, SAGE in the Soviet Union, GALLEX in Italy and Super-Kamiokande.
6 giorni fa · The Lambda-CDM, Lambda cold dark matter, or ΛCDM model is a mathematical model of the Big Bang theory with three major components: a cosmological constant, denoted by lambda (Λ), associated with dark energy. the postulated cold dark matter, denoted by CDM. ordinary matter. It is referred to as the standard model of Big Bang cosmology [1 ...
8 mag 2024 · Abstract: We quantify the effects on the evolution of solar neutrinos of light spin-zero particles with pseudoscalar couplings to leptons and scalar couplings to nucleons. In this scenario the matter potential sourced by the nucleons in the Sun's matter gives rise to spin precession of the relativistic neutrino ensemble.
6 giorni fa · For example, if the average neutrino mass were over 50 eV/c 2 (less than 10 −5 of the mass of an electron), the universe would collapse. CMB data and other methods indicate that their average mass probably does not exceed 0.3 eV/c 2. Thus, observed neutrinos cannot explain dark matter.
3 mag 2024 · Based on the neutrino oscillation analysis from all solar experiments, including the SK 5805 days dataset, the best-fit neutrino oscillation parameters are sin 2 θ 12, solar = 0.306 ± 0.013 and Δ m 21, solar 2 = (6.1 0 − 0.81 + 0.95) × 10 − 5 eV 2, with a deviation of about 1.5 σ from the Δ m 21 2 parameter obtained by KamLAND.
