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First Observation of Electron Scattering from Online-Produced Radioactive Target.

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Researchers achieved electron scattering off unstable Cesium-137 nuclei using a novel storage ring technique. This breakthrough enables detailed study of exotic nuclei structures with the new femtoscope.

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Area of Science:

  • Nuclear Physics
  • Atomic Physics
  • Particle Physics

Background:

  • Studying unstable nuclei is crucial for understanding nuclear structure.
  • Existing methods for creating and studying short-lived nuclei are limited.
  • Electron scattering offers a precise probe for nuclear properties.

Purpose of the Study:

  • To develop a novel method for electron scattering off unstable nuclei.
  • To create a high-density, stationary target of unstable Cesium-137 ions.
  • To realize and demonstrate the capability of a femtoscope for nuclear structure investigations.

Main Methods:

  • Produced unstable nuclei via photofission of uranium.
  • Developed a new target-forming technique using an electron storage ring to confine Cesium-137 ions.
  • Implemented beam stacking to increase ion beam intensity.
  • Performed electron scattering experiments.

Main Results:

  • Achieved an average luminosity of 0.9×10^26 cm^-2 s^-1 for Cesium-137.
  • Reached an ion beam intensity of approximately 2×10^7 ions per pulse.
  • Obtained angular distribution of elastically scattered electrons consistent with theoretical calculations.

Conclusions:

  • Successfully demonstrated electron scattering off unstable nuclei.
  • The developed femtoscope technology can clarify the structures of exotic and short-lived nuclei.
  • This work opens new avenues for nuclear structure research.