5.5: Standard Model
Investigate the fundamental symmetries that form the basis of the Standard Model. Other Information:
Neutrinos are produced by nuclear reactions in the sun, in supernovae, and in reactors. Understanding their properties is
essential for understanding stellar dynamics and supernova explosions. Studies with neutrinos generated in nuclear reactors
are complementary to those produced by high-energy accelerators. Similarly, precise measurements of the weak (radioactive)
decay of the neutron are complementary to measurements of weak interaction properties at high energies using particle accelerators.
Both could require refinements of the Standard Model. Our strategy includes the following emphasis: • Further investigate
neutrino mixing using neutrinos from the sun, cosmic-ray interactions, and nuclear reactors. • Measure the decays of tritium
nuclei and search for neutrinoless double beta decay to provide essential information about the absolute scale of neutrino
masses. • Using new cold and ultra-cold neutron facilities at the Manuel Lujan Jr. Neutron Scattering Center and the Spallation
Neutron Source, improve on existing measurements of the decay properties of the neutron and search for the electric dipole
moment of the neutron. • Using advanced laser trapping techniques, search for the electric dipole moment of radium-225.
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