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Doubly magic nucleus (108)(270)Hs162.

J Dvorak1, W Brüchle, M Chelnokov

  • 1Technische Universität München, D-85748 Garching, Germany.

Physical Review Letters
|February 7, 2007
PubMed
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Scientists synthesized and identified the new isotope 270Hs (hassium-270), a doubly magic deformed nucleus. Its observed alpha-particle decay properties provide the first experimental data to test theories of nuclear stability at N=162.

Area of Science:

  • Nuclear Physics
  • Heavy Element Research
  • Radioactive Decay Studies

Background:

  • Theoretical models predicted 270Hs (Z=108, N=162) as a doubly magic deformed nucleus.
  • Nuclear stability at the predicted N=162 neutron shell closure is a key area of research.

Purpose of the Study:

  • To experimentally synthesize and identify the new nuclide 270Hs.
  • To measure the nuclear decay properties of 270Hs, specifically its alpha-particle emission and half-life.
  • To compare experimental findings with theoretical predictions for the N=162 shell stability.

Main Methods:

  • Production of Hs isotopes via the 26Mg + 248Cm nuclear reaction.
  • Rapid chemical isolation techniques for separating synthesized Hs isotopes.
  • Analysis of genetically linked nuclear decay chains to identify parent and daughter nuclides.

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Main Results:

  • Observation of 15 genetically linked decay chains.
  • Identification of four decay chains attributed to the new nuclide 270Hs.
  • Measured alpha-decay energy (Qalpha) of 9.02±0.03 MeV for 270Hs.
  • Observed spontaneous fission of the daughter nuclide 266Sg with a half-life of 444(-148)(+444) ms.
  • Estimated production cross-section of approximately 3 pb for 270Hs.

Conclusions:

  • 270Hs has been experimentally identified as a new nuclide.
  • The measured decay properties of 270Hs offer the first experimental validation for theoretical predictions concerning the N=162 shell closure.
  • This study opens new avenues for investigating nuclear structure and stability in superheavy elements.