631 research outputs found
Symmetry and Supersymmetry in Nuclear Pairing: Exact Solutions
Pairing plays a crucial role in nuclear spectra and attempts to describe it
has a long history in nuclear physics. The limiting case in which all single
particle states are degenerate, but with different s-wave pairing strengths was
only recently solved. In this strong coupling limit the nuclear pairing
Hamiltonian also exhibits a supersymmetry. Another solution away from those
limits, namely two non-degenerate single particle states with different pairing
strengths, was also given. In this contribution these developments are
summarized and difficulties with possible generalizations to more single
particle states and d-wave pairing are discussed.Comment: 6 pages of LATEX, to be published in the Proceedings of the "10th
Int. Spring Seminar on Nuclear Physics: New Quests in Nuclear Structure",
Vietri Sul Mare, May 21-25, 201
Supersymmetry and Nuclear Pairing
We show that nuclear pairing Hamiltonian exhibits supersymmetry in the
strong-coupling limit. The underlying supersymmetric quantum mechanical
structure explains the degeneracies between the energies of the N and Nmax-N+1
pair eigenstates. The supersymmetry transformations connecting these states are
given.Comment: 4 pages of REVTEX, one figur
Neutrino interactions in astrophysics and the third neutrino mixing angle theta13
The third neutrino mixing angle theta13 is the least known one. In this
contribution, after a brief discussion of the current efforts to determine the
value of this angle better, various astrophysical implications of a non-zero
value of theta13 are summarized.Comment: 6 pages, Proceedings of OMEG10 Symposium, Osaka, Japa
Overview of Neutrino-Nucleus Interactions
An overview of neutrino-nucleus interactions is presented. After a brief
discussion of theory and applications of detector response three examples are
discussed: i) Recent work on neutrino-deuteron reactions, ii) Probing
strangeness content of the nucleon with neutrinos, and iii) The role of
neutrino reactions in supernova dynamics and r-process nucleosynthesis.Comment: 10 pages, 4 figures; proceedings of the Yukawa International Seminar
2001 (YKIS01), Physics of Unstable Nuclei, November 5-10, 2001, Kyoto, Japa
Neutrino Mixing and Oscillations in Astrophysical Environments
A brief review of the current status of neutrino mixing and oscillations in
astrophysical environments, with particular emphasis on the Sun and
core-collapse supernovae, is given. Implications of the existence of sterile
states which mix with the active neutrinos are discussed.Comment: Proceedings of the OMEG12 Conference, Tsukuba, Japa
Symmetries of Neutrino Physics
In this contribution to the proceedings of a conference honoring the career
of Francesco Iachello, two applications of symmetry principles to neutrino
physics are described. These applications are the connection between fermion
pairing in many-body physics and the neutrino mass as well as collective
neutrino oscillationsComment: 7 pages, Proceedings of the conference "SYMMETRIES AND ORDER:
Algebraic Methods in Many Body Systems
Solar Neutrino Matter Effects Redux
Following recent low-threshold analysis of the Sudbury Neutrino Observatory
and asymmetry measurements of the BOREXINO Collaboration of the solar neutrino
flux, we revisit the analysis of the matter effects in the Sun. We show that
solar neutrino data constrains the mixing angle poorly and that
subdominant Standard Model effects can mimic the effects of the physics beyond
the Standard Model.Comment: 12 pages of LATEX, 8 figure
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