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Area of Science:

  • Nuclear Physics
  • Atomic Physics

Background:

  • Superheavy nuclei research explores the limits of nuclear stability.
  • The N=152 neutron shell closure is a key region for nuclear structure theory.

Purpose of the Study:

  • To directly measure the masses of specific transfermium isotopes.
  • To verify theoretical predictions of nuclear properties near the N=152 shell closure.

Main Methods:

  • Utilized a multireflection time-of-flight mass spectrograph for precise mass measurements.
  • Employed hot- and cold-fusion reactions to produce the target nuclei.
  • Established anchor points using alpha decay chains for mass determination of heavier nuclei.

Main Results:

  • Direct mass measurements for ^{246}Es, ^{251}Fm, ^{249-252}Md, and ^{254}No.
  • First-time mass measurements for ^{246}Es and ^{249,250,252}Md.
  • Determined masses of heavier nuclei up to ^{261}Bh and ^{266}Mt.
  • New mass data show good agreement with macroscopic-microscopic nuclear models.

Conclusions:

  • The experimental masses corroborate the existence of the deformed N=152 neutron shell closure for Md and Lr isotopes.
  • Updated empirical shell gap parameter supports the significance of the N=152 shell closure.