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Title: Probing neutrino mass hierarchy by comparing the charged-current and neutral-current interaction rates of supernova neutrinos

Abstract

The neutrino mass hierarchy is one of the neutrino fundamental properties yet to be determined. We introduce a method to determine neutrino mass hierarchy by comparing the interaction rate of neutral current (NC) interactions, ν(ν-bar)+p→ν(ν-bar)+p, and inverse beta decays (IBD), ν-bar{sub e}+p→n+e{sup +}, of supernova neutrinos in scintillation detectors. Neutrino flavor conversions inside the supernova are sensitive to neutrino mass hierarchy. Due to Mikheyev-Smirnov-Wolfenstein effects, the full swapping of ν-bar{sub e} flux with the ν-bar{sub x} (x=μ, τ) one occurs in the inverted hierarchy, while such a swapping does not occur in the normal hierarchy. As a result, more high energy IBD events occur in the detector for the inverted hierarchy than the high energy IBD events in the normal hierarchy. By comparing IBD interaction rate with the mass hierarchy independent NC interaction rate, one can determine the neutrino mass hierarchy.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [5];  [4]
  1. Center for General Education, Chang Gung University,Kwei-Shan, Taoyuan, 333, Taiwan (China)
  2. (LeCosPA), National Taiwan University, Taipei, 106, Taiwan (China)
  3. Institute of Physics, National Chiao Tung University,Hsinchu, 300, Taiwan (China)
  4. Department of Electrophysics, National Chiao Tung University,Hsinchu, 300, Taiwan (China)
  5. Leung Center for Cosmology and Particle Astrophysics (LeCosPA), National Taiwan University, Taipei, 106, Taiwan (China)
  6. (China)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22572121
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2016; Journal Issue: 07; Other Information: PUBLISHER-ID: JCAP07(2016)039; OAI: oai:repo.scoap3.org:16558; cc-by Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHARGED CURRENTS; COSMIC NEUTRINOS; ELECTRON NEUTRINOS; FLAVOR MODEL; MUON NEUTRINOS; NEUTRAL CURRENTS; NEUTRAL-CURRENT INTERACTIONS; NEUTRINO-PROTON INTERACTIONS; REST MASS; SCINTILLATION COUNTERS; SUPERNOVAE; TAU NEUTRINOS

Citation Formats

Lai, Kwang-Chang, Leung Center for Cosmology and Particle Astrophysics, Lee, Fei-Fan, Lee, Feng-Shiuh, Lin, Guey-Lin, Institute of Physics, National Chiao Tung University,Hsinchu, 300, Taiwan, Liu, Tsung-Che, and Yang, Yi. Probing neutrino mass hierarchy by comparing the charged-current and neutral-current interaction rates of supernova neutrinos. United States: N. p., 2016. Web. doi:10.1088/1475-7516/2016/07/039.
Lai, Kwang-Chang, Leung Center for Cosmology and Particle Astrophysics, Lee, Fei-Fan, Lee, Feng-Shiuh, Lin, Guey-Lin, Institute of Physics, National Chiao Tung University,Hsinchu, 300, Taiwan, Liu, Tsung-Che, & Yang, Yi. Probing neutrino mass hierarchy by comparing the charged-current and neutral-current interaction rates of supernova neutrinos. United States. doi:10.1088/1475-7516/2016/07/039.
Lai, Kwang-Chang, Leung Center for Cosmology and Particle Astrophysics, Lee, Fei-Fan, Lee, Feng-Shiuh, Lin, Guey-Lin, Institute of Physics, National Chiao Tung University,Hsinchu, 300, Taiwan, Liu, Tsung-Che, and Yang, Yi. 2016. "Probing neutrino mass hierarchy by comparing the charged-current and neutral-current interaction rates of supernova neutrinos". United States. doi:10.1088/1475-7516/2016/07/039.
@article{osti_22572121,
title = {Probing neutrino mass hierarchy by comparing the charged-current and neutral-current interaction rates of supernova neutrinos},
author = {Lai, Kwang-Chang and Leung Center for Cosmology and Particle Astrophysics and Lee, Fei-Fan and Lee, Feng-Shiuh and Lin, Guey-Lin and Institute of Physics, National Chiao Tung University,Hsinchu, 300, Taiwan and Liu, Tsung-Che and Yang, Yi},
abstractNote = {The neutrino mass hierarchy is one of the neutrino fundamental properties yet to be determined. We introduce a method to determine neutrino mass hierarchy by comparing the interaction rate of neutral current (NC) interactions, ν(ν-bar)+p→ν(ν-bar)+p, and inverse beta decays (IBD), ν-bar{sub e}+p→n+e{sup +}, of supernova neutrinos in scintillation detectors. Neutrino flavor conversions inside the supernova are sensitive to neutrino mass hierarchy. Due to Mikheyev-Smirnov-Wolfenstein effects, the full swapping of ν-bar{sub e} flux with the ν-bar{sub x} (x=μ, τ) one occurs in the inverted hierarchy, while such a swapping does not occur in the normal hierarchy. As a result, more high energy IBD events occur in the detector for the inverted hierarchy than the high energy IBD events in the normal hierarchy. By comparing IBD interaction rate with the mass hierarchy independent NC interaction rate, one can determine the neutrino mass hierarchy.},
doi = {10.1088/1475-7516/2016/07/039},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2016,
place = {United States},
year = 2016,
month = 7
}
  • It was recently realized that three-flavor effects could peculiarly modify the development of spectral splits induced by collective oscillations, for supernova neutrinos emitted during the cooling phase of a protoneutron star. We systematically explore this case, explaining how the impact of these three-flavor effects depends on the ordering of the neutrino masses. In inverted mass hierarchy, the solar mass splitting gives rise to instabilities in regions of the (anti)neutrino energy spectra that were otherwise stable under the leading two-flavor evolution governed by the atmospheric mass splitting and by the 1-3 mixing angle. As a consequence, the high-energy spectral splits foundmore » in the electron (anti)neutrino spectra disappear, and are transferred to other flavors. Imperfect adiabaticity leads to smearing of spectral swap features. In normal mass hierarchy, the three-flavor and the two-flavor instabilities act in the same region of the neutrino energy spectrum, leading to only minor departures from the two-flavor treatment.« less
  • We investigate the feasibility of probing the neutrino mass hierarchy and the mixing angle {phi}{sub 13} with the neutrino burst from a future supernova. An inverse power-law density {rho}{approx}r{sup n} with varying n is adopted in the analysis as the density profile of a typical core-collapse supernova. The survival probabilities of {nu}{sub e} and {nu}{sub e} are shown to reduce to two-dimensional functions of n and {phi}{sub 13}. It is found that in the n-sin{sup 2}{phi}{sub 13} parameter space, the 3D plots of the probability functions exhibit highly nontrivial structures that are sensitive to the mass hierarchy, the mixing anglemore » {phi}{sub 13}, and the value of n. The conditions that lead to observable differences in the 3D plots are established. With the uncertainty of n considered, a qualitative analysis of the Earth matter effect is also included.« less
  • No abstract prepared.
  • The {gamma}-ray production in neutral-current (NC) neutrino-oxygen interaction is very important to the detection of neutrinos from supernova explosion in a neutrino experiment using water target like Super-K, since those {gamma}-rays can become extra signals or unexpected background in the energy region from 5 MeV to 30 MeV. We discuss a possible experiment to measure {gamma}-rays in {sup 16}O(p, p') and {sup 16}O({sup 3}He, t) reactions at Research Center for Nuclear Physics (RCNP, Osaka). Such measurements should provide good information on the {gamma}-ray emission spectra in neutrino-oxygen reactions.
  • Both neutral- and charged-current neutrino-induced disintegration of deuterium are studied for energies up to 160 MeV. All relevant transition operators and final states are included. The first-forbidden transitions to {ital P} states, which are often neglected, are found to be important at energies above about 40 MeV; those associated with the vector current are examined by means of an extended Siegert's theorem. Recoil corrections are included. Spectrum-averaged cross sections are calculated for solar and supernova neutrinos. Of particular significance is the resulting enhanced sensitivity of proposed heavy-water Cherenkov detectors to supernova muon and tauon neutrinos.