Anomalies and sterile neutrinos : Implications of new theoretical results
Kostensalo, J., & Suhonen, J. (2019). Anomalies and sterile neutrinos : Implications of new theoretical results. In O. Civitarese, I. Stekl, & J. Suhonen (Eds.), MEDEX’19 : Workshop on Calculation of Double-Beta-Decay Matrix Elements (Article 020016). American Institute of Physics. AIP Conference Proceedings, 2165. https://doi.org/10.1063/1.5130977
Published inAIP Conference Proceedings
© 2019 Author(s)
The reactor antineutrino and the gallium anomalies have been long unexplained. Possible explanations for both of these anomalies include new physics, such as the existence of one or more eV-scale sterile neutrino. However, the previous theoretical calculations, which do not replicate the experimental results, rely on many simplifying approximations. We have performed shell model calculations in order to gain insights into these issues. In the reactor-antineutrino analysis the beta decays contributing to the cumulative electron spectrum are usually assumed to have allowed spectral shapes. However, many of these decays are actually first-forbidden. Moreover, these decays dominate the experimentally observable region. Based on the recent results, the use of this allowed approximation can at least partially explain the so called reactor antineurtino anomaly. Our new large-scale shell model calculations regarding the neutrino-nucleus scattering cross section off 71Ga decreases the gap between theory and the experimental results of GALLEX and SAGE experiments. Conflict between charge-exchange BGTs and the neutrino-nucleus cross sections can to some extent be explained by destructive interference between Gamow-Teller and tensor contributions. ...
PublisherAmerican Institute of Physics
Parent publication ISBN978-0-7354-1910-0
ConferenceWorkshop on Calculation of Double-Beta-Decay Matrix Elements
Is part of publicationMEDEX’19 : Workshop on Calculation of Double-Beta-Decay Matrix Elements
ISSN Search the Publication Forum0094-243X
Publication in research information system
MetadataShow full item record
Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThis work has been partially supported by the Academy of Finland under the Academy project no. 318043. J. K. acknowledges the ﬁnancial support from Jenny and Antti Wihuri Foundation.
Showing items with similar title or keywords.
Theoretical predictions of wimp-nucleus and neutrino-nucleus scattering in context of dark matter direct detection Pirinen, Pekka (University of Jyväskylä, 2018)The nature of dark matter is at present an open question. Assuming the main component of dark matter consists of weakly interacting massive particles (WIMPs), directly detecting such particle via a scattering process ...
Estimated solar-neutrino capture rates of 131Xe : implications for multi-tonne Xe-based experiments Kostensalo, J.; Suhonen, J.; Zuber, K. (Institute of Physics, 2021)Various large-scale experiments for double beta decay or dark matter are based on xenon. Current experiments are on the tonne scale, but future ideas also aim for even larger sizes. Here we study the potential of the isotope ...
Calculated solar-neutrino capture rate for a radiochemical 205Tl-based solar-neutrino detector Kostensalo, Joel; Suhonen, Jouni; Zuber, K. (American Physical Society, 2020)Radiochemical experiments for low-energy solar-neutrino detection have been making headlines by exploiting the isotopes 37Cl and 71Ga. Such a very low-threshold measurement of this type can also be performed using 205Tl, ...
First results on ProtoDUNE-SP liquid argon time projection chamber performance from a beam test at the CERN Neutrino Platform The DUNE collaboration (Institute of Physics, 2020)The ProtoDUNE-SP detector is a single-phase liquid argon time projection chamber with an active volume of 7.2× 6.1× 7.0 m3. It is installed at the CERN Neutrino Platform in a specially-constructed beam that delivers charged ...
Neutral current supernova neutrino-nucleus scattering off 127I and 133Cs Hellgren, Matti (2020)Tutkielmassa tarkasteltiin astrofysikaalisten neutriinojen sirontaa stabiileista jodi- ja caesium ytimistä 127I and 133Cs, tarkoituksena arvioida kyseisten ytimien hyödyntämisen mahdollisuutta neutriinojen havaitsemisessa. ...