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Related Experiment Videos

Shape coexistence and the N = 28 shell closure far from stability

Sarazin1, Savajols, Mittig

  • 1GANIL, BP 5027, F-14076 Caen Cedex 05, France.

Physical Review Letters
|September 16, 2000
PubMed
Summary

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This summary is machine-generated.

This study measured masses for 31 neutron-rich nuclei, improving precision for 19 and measuring 12 new ones. Findings reveal shell structure changes and shape coexistence in chlorine, sulfur, and phosphorus isotopes near N=28.

Area of Science:

  • Nuclear physics
  • Atomic physics

Background:

  • Understanding nuclear structure and stability is crucial for nuclear astrophysics and fundamental physics.
  • Neutron-rich isotopes provide unique insights into nuclear forces and shell effects far from stability.

Purpose of the Study:

  • To precisely measure the masses of 31 neutron-rich nuclei (A=29-47).
  • To investigate changes in nuclear shell structure and the phenomenon of shape coexistence in light, neutron-rich isotopes.

Main Methods:

  • High-precision mass spectrometry was employed to measure nuclear masses.
  • Experimental data was compared with theoretical models, including shell model and relativistic mean field calculations.

Main Results:

  • The masses of 19 isotopes were measured with improved precision, and 12 new masses were determined.

Related Experiment Videos

  • A significant change in shell structure was observed for neutron-rich chlorine, sulfur, and phosphorus isotopes around the neutron number N=28.
  • Evidence for shape coexistence, including an isomer in 43S, was found, linked to deformed prolate ground states.

    • Conclusions:

    • The observed shell structure evolution and shape coexistence are attributed to deformed prolate ground state configurations.
    • These findings provide critical data for refining nuclear structure models and understanding the limits of nuclear stability.