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Related Experiment Videos

Superdeformation in the doubly magic nucleus (40)(20)Ca(20).

E Ideguchi1, D G Sarantites, W Reviol

  • 1Chemistry Department, Washington University, St. Louis, Missouri 63130, USA.

Physical Review Letters
|December 12, 2001
PubMed
Summary

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Researchers observed a new rotational band in the doubly magic calcium-40 nucleus. This indicates a superdeformed shape, suggesting an 8-particle, 8-hole excitation in nuclear structure physics.

Area of Science:

  • Nuclear Physics
  • Atomic Physics

Background:

  • Doubly magic nuclei, like calcium-40, are typically spherical.
  • Deviations from spherical shape can indicate exotic nuclear structures and excitations.

Purpose of the Study:

  • To investigate the nuclear structure of the doubly magic, self-conjugate nucleus (40)(20)Ca(20).
  • To characterize the observed rotational band and its underlying nuclear excitation.

Main Methods:

  • Observation of gamma-ray transitions within the nucleus.
  • Measurement of the transition quadrupole moment.
  • Theoretical explanation using cranked relativistic mean field calculations.

Main Results:

  • A rotational band with seven gamma-ray transitions was identified, spanning spin 2ħ to 16ħ.

Related Experiment Videos

  • The measured transition quadrupole moment (1.80(+0.39)(-0.29)eb) confirms a superdeformed shape (β2 = 0.59(+0.11)(-0.07)).
  • Calculations attribute this band to an 8-particle, 8-hole excitation.

    • Conclusions:

    • The doubly magic nucleus calcium-40 can exhibit a superdeformed shape.
    • This superdeformation arises from a specific multi-particle, multi-hole excitation.
    • Confirms the predictive power of cranked relativistic mean field theory for nuclear structure.