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Interplay between quantum shells and orientation in quasifission.

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This summary is machine-generated.

Quasifission hinders heavy system fusion via rapid breakup. This study reveals how uranium-238

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Area of Science:

  • Nuclear Physics
  • Heavy Ion Collisions
  • Quantum Chemistry

Background:

  • Quasifission, a process where heavy nuclei break apart, impedes fusion reactions.
  • Understanding quasifission requires knowledge of colliding nuclei structures and resulting fragments.

Purpose of the Study:

  • Investigate the role of colliding nuclei structure in quasifission.
  • Explore the interplay between projectile-target orientation and quantum shell effects in fragment formation.

Main Methods:

  • Experimental measurement of mass-angle correlations for calcium-40 + uranium-238 collisions.
  • Microscopic quantum calculations to model the quasifission process.

Main Results:

  • Demonstrated an unexpected interplay between uranium-238's orientation and fragment shell effects.
  • Calculations indicate tip collisions with uranium-238 yield quasifission fragments near magic number Z=82.
  • Side collisions with uranium-238 are more conducive to fusion.

Conclusions:

  • Nuclear structure, specifically uranium-238 orientation and fragment shell effects, significantly influences quasifission.
  • Collision geometry is critical in determining whether quasifission or fusion occurs.