Realistic Earth matter effects and a method to acquire information about small {theta}{sub 13} in the detection of supernova neutrinos
- College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 (China)
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 5001 (United States)
In this paper, we first calculate the realistic Earth matter effects in the detection of type II supernova neutrinos at the Daya Bay reactor neutrino experiment which is currently under construction. It is found that the Earth matter effects depend on the neutrino incident angle {theta}, the neutrino mass hierarchy {delta}m{sub 31}{sup 2}, the crossing probability at the high resonance region inside the supernova, P{sub H}, the neutrino temperature, T{sub {alpha}}, and the pinching parameter in the neutrino spectrum, {eta}{sub {alpha}}. We also take into account the collective effects due to neutrino-neutrino interactions inside the supernova. With the expression for the dependence of P{sub H} on the neutrino mixing-angle {theta}{sub 13}, we obtain the relations between {theta}{sub 13} and the event numbers for various reaction channels of supernova neutrinos. Using these relations, we propose a possible method to acquire information about {theta}{sub 13} smaller than 1.5 deg. Such a sensitivity cannot be achieved by the reactor neutrino deta at the Daya Bay experiment which has a sensitivity of the order of {theta}{sub 13}{approx}3 deg. Furthermore, we apply this method to other neutrino experiments, i.e. Super-K, SNO, KamLAND, LVD, MinBooNE, Borexino, and Double-Chooz. We also study the energy spectra of the differential event numbers, dN/dE.
- OSTI ID:
- 21296427
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 79, Issue 11; Other Information: DOI: 10.1103/PhysRevD.79.113007; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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