Neutrino oscillation signatures of oxygen-neon-magnesium supernovae

Journal Article · Tue Jul 15 00:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.023016· OSTI ID:21250320

Lunardini, C ^[1]; Mueller, B; Janka, H -Th ^[2]

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1. Arizona State University, Tempe, Arizona 85287-1504 (United States)
2. Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching (Germany)

We discuss the flavor conversion of neutrinos from core-collapse supernovae that have oxygen-neon-magnesium (ONeMg) cores. Using the numerically calculated evolution of the star up to 650 ms post bounce, we find that, for the normal mass hierarchy, the electron neutrino flux in a detector shows signatures of two typical features of an ONeMg-core supernova: a sharp step in the density profile at the base of the He shell and a faster shock wave propagation compared to iron core supernovae. Before the shock hits the density step (t < or approx. 150 ms), the survival probability of electron neutrinos above {approx}20 MeV of energy is about {approx}0.68, in contrast to values of {approx}0.32 or less for an iron core supernova. The passage of the shock through the step and its subsequent propagation cause a decrease of the survival probability and a decrease of the amplitude of oscillations in the Earth, reflecting the transition to a more adiabatic propagation inside the star. These changes affect the lower energy neutrinos first; they are faster and more sizable for larger {theta}{sub 13}. They are unique of ONeMg-core supernovae, and give the possibility to test the speed of the shock wave. The time modulation of the Earth effect and its negative sign at the neutronization peak are the most robust signatures in a detector.

• OSTI ID: 21250320
• Journal Information: Physical Review. D, Particles Fields, Vol. 78, Issue 2; Other Information: DOI: 10.1103/PhysRevD.78.023016; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AMPLITUDES
COMPUTERIZED SIMULATION
DENSITY
ELECTRON NEUTRINOS
EVOLUTION
FLAVOR MODEL
IRON
MAGNESIUM
MASS
MEV RANGE 10-100
MODULATION
NEON
NEUTRINO OSCILLATION
NUMERICAL ANALYSIS
OXYGEN
PROBABILITY
SHOCK WAVES
SUPERNOVAE
VELOCITY