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Probing the Shell Effects on Fission: The New Superheavy Nucleus ^{257}Sg.

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Researchers discovered a new isotope, Seaborgium-257 (Sg-257), which decays via spontaneous fission and alpha emission. Evidence for a K-isomeric state in Sg-259 was also found, offering insights into superheavy nuclei.

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Area of Science:

  • Nuclear Physics
  • Superheavy Element Research

Background:

  • Investigating decay properties of neutron-deficient Seaborgium (Sg) isotopes is crucial for understanding nuclear structure.
  • Superheavy nuclei exhibit unique properties influenced by shell effects.

Purpose of the Study:

  • To study the decay characteristics of neutron-deficient Sg isotopes.
  • To discover new Sg isotopes and investigate isomeric states.

Main Methods:

  • Utilized the TASCA gas-filled recoil separator at GSI, Darmstadt.
  • Employed ^{52}Cr+^{206,208}Pb nuclear reactions to synthesize Sg isotopes.

Main Results:

  • Reported the discovery of the new isotope ^{257}Sg, with a half-life of 12.6 ms, decaying by spontaneous fission and alpha emission.
  • Observed alpha decay of ^{257}Sg followed by fission of ^{253}Rf.
  • Provided strong evidence for a K-isomeric state in ^{259}Sg, the first observed in superheavy nuclei with 106 protons.

Conclusions:

  • The findings suggest novel shell effects in neutron-deficient superheavy nuclei.
  • Experimental data provide insights into the nuclear landscape and decay modes of superheavy elements.