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High Energy, Nuclear, Particle Physics
KamLAND-Zen Results: Search for Majorana Neutrinos in Inverted Mass Hierarchy
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[QUOTE="Orodruin, post: 5473243, member: 510075"] From oscillation experiments, we currently have knowledge on the differences of the mass squares of the neutrino mass eigenstates ##\Delta m_{ij}^2 = m_i^2 - m_j^2##. The sign of ##\Delta m_{31}^2## is currently unknown and if it is positive it is referred to as normal ordering and otherwise as inverted ordering. However, oscillation experiments give us no insight to the absolute mass scale of the neutrinos, i.e., the lightest neutrino could still be massless. If it is massless or has a very small mass, the neutrino masses are hierarchical, i.e., their ratios are large. However, if the lightest neutrino mass ##m_0## is such that ##m_0^2 \gg |\Delta m_{31}|^2##, all neutrino masses will be of similar size. This would also mean that it would be very difficult to tell the ordering apart in neutrinoless double beta decay experiments as the effective mass measured in these experiments would be very similar. You can see this in one of the figures of the KamLAND-Zen paper: [ATTACH=full]187732[/ATTACH] The quasi-degenerate regime starts when the lightest neutrino mass is around 0.1 eV. As for the choice of nucleus, there are many factors other than half-life to consider, e.g., the Q-values and the uncertainties in the nuclear matrix element to mention a few. I am not an expert in the experimental implementation, someone else might be able to be more precise. [/QUOTE]
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KamLAND-Zen Results: Search for Majorana Neutrinos in Inverted Mass Hierarchy
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