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Shape and pairing fluctuation effects on neutrinoless double beta decay nuclear matrix elements.

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Researchers calculated nuclear matrix elements (NME) for neutrinoless double beta decay. Including pairing fluctuations significantly increased NME, shortening predicted isotope half-lives for enhanced detection sensitivity.

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Area of Science:

  • Nuclear physics
  • Particle physics
  • Quantum mechanics

Background:

  • Neutrinoless double beta decay is a key process for understanding neutrino properties.
  • Accurate calculation of nuclear matrix elements (NME) is crucial for interpreting experimental results.
  • Existing methods often simplify the complex nuclear landscape.

Purpose of the Study:

  • To compute NME for promising neutrinoless double beta decay candidates.
  • To incorporate deformation and pairing fluctuations consistently within energy density functional methods.
  • To develop a versatile method applicable to various decay scenarios without fine-tuning.

Main Methods:

  • Utilized energy density functional methods.
  • Explicitly included deformation and pairing fluctuations.
  • Employed a finite range, density-dependent Gogny force.
  • Ensured preservation of particle number and angular momentum symmetries.

Main Results:

  • Achieved a 10%-40% increase in NME compared to calculations without pairing fluctuations.
  • Demonstrated the method's applicability across different isotopes.
  • Reduced the predicted half-lives for the studied isotopes.

Conclusions:

  • The inclusion of pairing fluctuations significantly impacts NME calculations.
  • This refined method provides more accurate predictions for neutrinoless double beta decay rates.
  • The findings enhance the potential for detecting this rare nuclear process.