244 research outputs found
Underground laboratory JUNA shedding light on stellar nucleosynthesis
Extremely low background experiments to measure key nuclear reaction cross
sections of astrophysical interest are conducted at the world's deepest
underground laboratory, the Jingping Underground laboratory for Nuclear
Astrophysics (JUNA). High precision measurements provide reliable information
to understand nucleosynthetic processes in celestial objects and resolve
mysteries on the origin of atomic nuclei discovered in the first generations of
Pop. III stars in the universe and meteoritic SiC grains in the solar system.Comment: 5 pages, 2 figure
Exact Methods for Self Interacting Neutrinos
The effective many-body Hamiltonian which describes vacuum oscillations and
self interactions of neutrinos in a two flavor mixing scheme under the single
angle approximation has the same dynamical symmetries as the well known BCS
pairing Hamiltonian. These dynamical symmetries manifest themselves in terms of
a set of constants of motion and can be useful in formulating the collective
oscillation modes in an intuitive way. In particular, we show that a neutrino
spectral split can be simply viewed as an avoided level crossing between the
eigenstates of a mean field Hamiltonian which includes a Lagrange multiplier in
order to fix the value of an exact many-body constant of motion. We show that
the same dynamical symmetries also exist in the three neutrino mixing scheme by
explicitly writing down the corresponding constants of motion.Comment: To appear in the proceedings of CETUP* 201
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