Probing Late Neutrino Mass Properties With SupernovaNeutrinos Page: 3 of 29
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In this paper we show that the presence of this new physics significantly modifies the
spectrum of supernova relic neutrinos (SRNs) at earth. This modification occurs because
SRNs can interact with cosmic background neutrinos through exchange of the new light
scalar. In  this effect was studied assuming a single flavor, Majorana, case. Here we
extend our study and include various interesting aspects related to the nature of the neutrino
flavor sector, for example the breaking of lepton number, the effect of multiple generation,
etc. For simplicity we confine our study here to late neutrino mass models with a single
U(1) symmetry. We show that the energy spectrum of the SRN flux is sensitive to the
type of neutrino mass hierarchy and whether neutrinos are Majorana or Dirac particles. We
discuss how in some specific cases one can get additional information about the neutrino
masses as well. In addition, detection of this signal would also be direct evidence of the
presence of the cosmic background neutrinos. Hundreds of events per year from the flux
of the SRN antineutrinos could be seen at next-generation large megaton water Cerenkov
detectors [13, 14] such as UNO, Hyper-Kamiokande or MEMPHYS if they are enriched with
Gadolinium , or from the flux of the SRN neutrinos in a large 100 kton liquid argon
neutrino detector .
In section II we show how the SRN flux, including cosmological evolution, is modified
through the new interactions. In section III we consider the normal and inverted neutrino
mass hierarchy cases as well as quasi-degenerate neutrino masses. We also consider the
possibility of neutrinos being either Majorana or Dirac particles. In addition we show that
there is a particularly interesting signal that leads to the determination of ratios of neutrino
masses. The conditions for establishing a statistically significant signal above background
are discussed in subsection G of section III. Finally, in section IV, we conclude.
II. THE SUPERNOVA RELIC NEUTRINO FLUX
The resonance interaction of the SRN with cosmic background neutrinos through the
exchange of a new light scalar was previously discussed in  for a single neutrino mass
eigenstate with my - 0.05eV.
In this paper we consider the case of the scalar interacting with three neutrino mass
eigenstates and show the very interesting effect on the observed SRN spectrum for the
normal mass hierarchy, inverted mass hierarchy, and for quasi-degenerate neutrino masses.
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Baker, Joseph; Goldberg, Haim; Perez, Gilad & Sarcevic, Ina. Probing Late Neutrino Mass Properties With SupernovaNeutrinos, article, August 8, 2007; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc895005/m1/3/: accessed June 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.