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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Applying machine learning methods for the analysis of two-dimensional mass spectra.

Z Gao1, A Solders1, A Al-Adili1

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This study introduces a new method to measure isomeric yield ratios in nuclear fission using Phase-Imaging Ion-Cyclotron-Resonance. The technique accurately determines the relative populations of nuclear states, improving fission yield measurements.

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Area of Science:

  • Nuclear Physics
  • Nuclear Spectroscopy
  • Fission Physics

Background:

  • Isomeric yield ratios are crucial for understanding nuclear structure and reaction dynamics in fission.
  • Accurate measurements are challenging due to the close proximity of isomeric states and detector limitations.

Purpose of the Study:

  • To develop and apply a novel analysis procedure for precise measurement of isomeric yield ratios in nuclear fission.
  • To enhance the accuracy of determining the relative populations of nuclear isomers using advanced detection and modeling techniques.

Main Methods:

  • Application of the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique with the JYFLTRAP facility.
  • Development of a novel analysis procedure for ion counting, detector efficiency correction, and decay loss compensation.
  • Implementation of a Bayesian Gaussian Mixture model for resolving closely spaced mass states.
  • Calibration of micro-channel plate detector efficiency using Cesium-133 ions and Gaussian Process modeling.

Main Results:

  • Successfully derived isomeric yield ratios by accurately determining the number of ions in each isomeric state.
  • Quantified and corrected for detector efficiency variations and decay losses.
  • Demonstrated the capability to resolve and quantify states with minimal mass differences.

Conclusions:

  • The developed PI-ICR analysis procedure provides a robust method for precise isomeric yield ratio measurements.
  • This advancement improves the understanding of nuclear fission processes and nuclear structure.
  • The methodology is applicable to other studies requiring precise population measurements of closely related nuclear states.