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First Exploration of Neutron Shell Structure below Lead and beyond N=126.

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Researchers probed neutron excitations in mercury-207 nuclei using a novel technique. This study provides crucial insights into the structure of heavy nuclei, essential for understanding the rapid neutron-capture process (r-process) in astrophysics.

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Area of Science:

  • Nuclear Physics
  • Astro-nuclear Physics
  • Nuclear Structure

Background:

  • Nuclei with over 126 neutrons are vital for understanding the astrophysical r-process.
  • The structure of these neutron-rich nuclei is largely unknown due to production challenges.

Purpose of the Study:

  • To explore the shell structure of nuclei below lead with more than 126 neutrons.
  • To experimentally probe neutron excitations in ^{207}Hg for the first time.

Main Methods:

  • Utilized the neutron-adding (d,p) reaction in inverse kinematics.
  • Employed a radioactive beam of ^{206}Hg at the ISOLDE Solenoidal Spectrometer.
  • Studied nuclei at energies above the Coulomb barrier.

Main Results:

  • Successfully performed spectroscopy of ^{207}Hg, providing the first experimental data on its nuclear structure.
  • Demonstrated the feasibility of using (d,p) reactions with radioactive beams in inverse kinematics.

Conclusions:

  • This work is a significant first step in characterizing the structure of nuclei critical to the r-process.
  • Improved understanding of these nuclei will refine models of heavy element nucleosynthesis.