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X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells
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Solar Axions Cannot Explain the XENON1T Excess.

Luca Di Luzio1, Marco Fedele2, Maurizio Giannotti3

  • 1Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, Germany.

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|October 9, 2020
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Summary

The XENON1T excess is unlikely due to solar axions. Such axions would conflict with stellar evolution observations, including pulsating white dwarfs and stellar parameters, with high statistical significance.

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Area of Science:

  • Particle physics
  • Astrophysics
  • Stellar evolution

Background:

  • The XENON1T experiment observed an excess of electronic recoils.
  • This excess was tentatively interpreted as a potential signal of solar axions.
  • Solar axions are hypothetical particles that could be produced in the Sun's core.

Purpose of the Study:

  • To investigate the viability of the solar axion interpretation of the XENON1T excess.
  • To compare the predictions of solar axion emission with astrophysical observations.

Main Methods:

  • Analysis of stellar evolution models.
  • Comparison of predicted stellar population changes with observational data.
  • Statistical significance assessment of discrepancies.

Main Results:

  • Solar axion emission at the level required by XENON1T would significantly alter stellar evolution.
  • Discrepancies observed in pulsating white dwarfs (3.3σ) and stellar parameters (exceeding 19σ).
  • The solar axion hypothesis is inconsistent with astrophysical constraints.

Conclusions:

  • The interpretation of the XENON1T excess in terms of solar axions is not tenable.
  • Astrophysical observations strongly disfavor the solar axion explanation.
  • Further investigation into the XENON1T excess requires considering alternative hypotheses.