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Abstract Sterile neutrinos can be produced through mixing with active neutrinos in the hot, dense core of a core-collapse supernova (SN). The standard bounds on the active-sterile mixing (sin2θ) from SN arise from SN1987A energy-loss, requiringEloss< 1052erg. In this work, we discuss a novel bound on sterile neutrino parameter space arising from the energy deposition through its decays inside the SN envelope. Using the observed underluminous SN IIP population, this energy deposition is constrained to be below ∼ 1050erg. Focusing on sterile neutrino mixing only with tau neutrino, for heavy sterile massesmsin the range 100 – 500 MeV, we find stringent constraints on sin2θτreaching two orders of magnitude lower than those from the SN1987A energy loss argument, thereby probing the mixing angles required for Type-I seesaw mechanism. Similar bounds will also be applicable to sterile mixing only with muons (sin2θμ).
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Neutrinoless double beta decay sensitivity of the XLZD rare event observatory
Abstract The XLZD collaboration is developing a two-phase xenon time projection chamber with an active mass of 60–80 t capable of probing the remaining weakly interacting massive particle-nucleon interaction parameter space down to the so-called neutrino fog. In this work we show that, based on the performance of currently operating detectors using the same technology and a realistic reduction of radioactivity in detector materials, such an experiment will also be able to competitively search for neutrinoless double beta decay in136Xe using a natural-abundance xenon target. XLZD can reach a 3σdiscovery potential half-life of 5.7 × 1027years (and a 90% CL exclusion of 1.3 × 1028years) with 10 years of data taking, corresponding to a Majorana mass range of 7.3–31.3 meV (4.8–20.5 meV). XLZD will thus exclude the inverted neutrino mass ordering parameter space and will start to probe the normal ordering region for most of the nuclear matrix elements commonly considered by the community.
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- Award ID(s):
- 2046549
- PAR ID:
- 10615399
- Author(s) / Creator(s):
- ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »
- Publisher / Repository:
- Journal of Physics
- Date Published:
- Journal Name:
- Journal of Physics G: Nuclear and Particle Physics
- Volume:
- 52
- Issue:
- 4
- ISSN:
- 0954-3899
- Page Range / eLocation ID:
- 045102
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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- Free Publicly Accessible Full Text
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Accepted Manuscript
- Journal Article:
- https://doi.org/10.1088/1361-6471/adb900
