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Precise tests of internal-conversion theory.

J C Hardy1, N Nica, V E Iacob

  • 1Cyclotron Institute, Texas A&M University, College Station, TX 77845-3366, USA. hardy@comp.tamu.edu

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PubMed
Summary
This summary is machine-generated.

This study precisely measured K-shell internal conversion coefficients (ICCs) for cesium-134 and barium-137 transitions. Results confirm theoretical models that account for atomic K-shell vacancies.

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Area of Science:

  • Nuclear Physics
  • Atomic Physics
  • Quantum Electrodynamics

Background:

  • Internal conversion coefficients (ICCs) are crucial for understanding nuclear decay processes.
  • Previous ICC measurements for specific transitions showed discrepancies with theoretical predictions.
  • The influence of atomic K-shell vacancies on ICCs requires precise experimental validation.

Purpose of the Study:

  • To experimentally determine K-shell ICCs for the 127.5-keV E3 transition in cesium-134 and the 661.7-keV M4 transition in barium-137.
  • To compare experimental ICC values with theoretical calculations, particularly concerning the inclusion of atomic K-shell vacancies.
  • To validate and extend previous findings on the role of K-shell vacancies in internal conversion.

Main Methods:

  • Utilized the 165.9-keV M1 transition in lanthanum-139 as a calibrant for high-precision measurements.
  • Employed advanced experimental techniques to measure ICCs with 0.6% precision.
  • Performed theoretical calculations of ICCs, both with and without accounting for the atomic K-shell vacancy.

Main Results:

  • Precisely determined K-shell ICCs for the specified transitions in cesium-134 and barium-137.
  • Experimental results demonstrated excellent agreement with theoretical calculations that included the atomic K-shell vacancy.
  • A significant disagreement was observed with calculations that neglected the K-shell vacancy.

Conclusions:

  • The experimental findings strongly support theoretical models of internal conversion that incorporate the atomic K-shell vacancy.
  • This study confirms the importance of the K-shell vacancy effect on ICCs across different elements, energies, and multipolarities.
  • The results align with and reinforce earlier conclusions drawn from studies on iridium-193.