Improved calculations of β decay backgrounds to new physics in liquid xenon detectors
Haselschwardt, S. J., Kostensalo, J., Mougeot, X., & Suhonen, J. (2020). Improved calculations of β decay backgrounds to new physics in liquid xenon detectors. Physical Review C, 102(6), Article 065501. https://doi.org/10.1103/PhysRevC.102.065501
Published inPhysical Review C
© 2020 the Authors
We present high-precision theoretical predictions for the electron energy spectra for the ground-state to ground-state β decays of 214Pb, 212Pb, and 85Kr most relevant to the background of liquid xenon dark matter detectors. The effects of nuclear structure on the spectral shapes are taken into account using large-scale shell-model calculations. Final spectra also include atomic screening and exchange effects. The impact of nuclear structure effects on the 214Pb and 212Pb spectra below ≈100 keV, pertinent for several searches for new physics, are found to be comparatively larger than those from the atomic effects alone. We find that the full calculation for 214Pb (212Pb) predicts 15.0%–23.2% (12.1%–19.0%) less event rate in a 1–15 keV energy region of interest compared to the spectrum calculated as an allowed transition when using values of the weak axial vector coupling in the range gA=0.7–1.0. The discrepancy highlights the importance of both a proper theoretical treatment and the need for direct measurements of these spectra for a thorough understanding of β decay backgrounds in future experiments. ...
PublisherAmerican Physical Society (APS)
ISSN Search the Publication Forum2469-9985
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 was supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-05CH11231 and by the Academy of Finland under Project No. 318043. J.K. acknowledges the financial support from the Jenny and Antti Wihuri Foundation.
Showing items with similar title or keywords.
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, ...
Muon-electron lepton-flavor-violating transitions : Shell-model calculations of transitions in 27Al Kostensalo, Joel; Suhonen, Jouni; Civitarese, O. (American Physical Society, 2018)In this paper we present the results of large-scale shell-model calculations of muon-to-electron lepton-flavorviolating transitions for the case of the target nucleus 27Al. We extend the previous shell-model calculations, done ...
Solar neutrino detection in liquid xenon detectors via charged-current scattering to excited states Haselschwardt, Scott; Lenardo, Brian; Pirinen, Pekka; Suhonen, Jouni (American Physical Society (APS), 2020)We investigate the prospects for real-time detection of solar neutrinos via the charged-current neutrino-nucleus scattering process in liquid xenon time projection chambers. We use a nuclear shell model, benchmarked with ...
Analysis of light neutrino exchange and short-range mechanisms in 0νββ decay Deppisch, Frank F.; Graf, Lukas; Iachello, Francesco; Kotila, Jenni (American Physical Society (APS), 2020)Neutrinoless double beta decay (0νββ) is a crucial test for lepton number violation. Observation of this process would have fundamental implications for neutrino physics, theories beyond the Standard Model and cosmology. ...
First-forbidden transitions in the reactor anomaly Hayen, L.; Kostensalo, J.; Severijns, N.; Suhonen, J. (American Physical Society, 2019)We describe here microscopic calculations performed on the dominant forbidden transitions in reactor antineutrino spectra above 4 MeV using the nuclear shell model. By taking into account Coulomb corrections in the most ...