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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Chemistry

Background:

  • Neutrinoless double beta decay is key to determining if neutrinos are Majorana particles (their own antiparticles).
  • The extremely long half-life of this decay necessitates highly sensitive detection methods to distinguish it from background radioactive processes.
  • Detecting the daughter atom, such as Barium-136 (Ba2+), offers a robust signature for neutrinoless double beta decay of Xenon-136 (Xe).

Purpose of the Study:

  • To advance the development of a 'barium-tagging' experiment for detecting neutrinoless double beta decay.
  • To create a sensor capable of identifying single Ba2+ ions within a high-pressure xenon gas detector.

Main Methods:

  • Proposed a fluorescent bicolour indicator as the core component of a single Ba2+ ion sensor.
  • The sensor design involves a monolayer of indicators that capture Ba2+ ions, forming a species with unique photophysical properties.
  • Detection relies on observing the indicator's response to laser interrogation, signaling the presence of a single Ba2+-coordinated ion.

Main Results:

  • Demonstrated a significant advancement towards a barium-tagging experiment by proposing a method for single Ba2+ ion detection.
  • The proposed fluorescent indicator system shows potential for identifying single Ba2+ ions in high-pressure xenon.

Conclusions:

  • The developed sensor technology is a critical step for future barium-tagging experiments searching for neutrinoless double beta decay.
  • This approach offers a promising pathway to confirm the nature of neutrinos and their antiparticle properties.