Improved calculations of beta decay backgrounds to new physics in liquid xenon detectors
| Autor: | Jouni Suhonen, Scott Haselschwardt, X. Mougeot, Joel Kostensalo |
|---|---|
| Přispěvatelé: | Lawrence Berkeley National Laboratory [Berkeley] (LBNL), University of Jyväskylä (JYU), Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), This 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., Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
electron
Electron 01 natural sciences Spectral line High Energy Physics - Experiment spectrum High Energy Physics - Experiment (hep-ex) Xenon [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] beta-rays ground state Nuclear Experiment (nucl-ex) Nuclear Experiment nuclear instrumentation Physics instrumentation xenon: liquid new physics: search for Nuclear structure axial-vector semileptonic decay Coupling (probability) simulation 3. Good health radioactivity Ground state ionizing radiation Semileptonic decay [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] energy spectrum FOS: Physical sciences chemistry.chemical_element spectrum analysis [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] Nuclear physics 0103 physical sciences structure [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] 010306 general physics numerical calculations signal processing Pseudovector krypton nucleus: semileptonic decay lead detector 010308 nuclear & particles physics background screening Decay data measurement shell model nuclear matter: effect dark matter: detector [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation coupling: axial-vector xenon metrology chemistry 13. Climate action spectral electron: energy spectrum |
| Zdroj: | Physical Review C Physical Review C, 2020, 102, pp.065501. ⟨10.1103/PhysRevC.102.065501⟩ Phys.Rev.C Phys.Rev.C, 2020, 102, pp.065501. ⟨10.1103/PhysRevC.102.065501⟩ Physical Review C, American Physical Society, 2020, 102, pp.065501. ⟨10.1103/PhysRevC.102.065501⟩ Physical Review |
| ISSN: | 2469-9985 2469-9993 |
| DOI: | 10.1103/PhysRevC.102.065501⟩ |
| Popis: | We present high-precision theoretical predictions for the electron energy spectra for the ground-state to ground-state $\beta$ decays of $^{214}$Pb, $^{212}$Pb, and $^{85}$Kr 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 $^{214}$Pb and $^{212}$Pb spectra below $\approx100$ 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 $^{214}$Pb ($^{212}$Pb) 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 $g_{\rm A}=0.7-1.0$. 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 $\beta$ decay backgrounds in future experiments. Comment: 7 pages, 3 figures; v3 matches version in Phys. Rev. C; v2&v3 include updated Q-values, results unchanged |
| Databáze: | OpenAIRE |
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