Production and Decay of Element 114: High Cross Sections and the New Nucleus 277Hs

Research output: Contribution to journalLetter


The fusion-evaporation reaction Pu-244(Ca-48, 3-4n)(288,289)114 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to the production and decay of (288, 289)114. At a compound nucleus excitation energy of E* = 39.8-43.9 MeV, the 4n evaporation channel cross section was 9.8(-3.1)(+3.9) pb. At E* = 36.1-39.5 MeV, that of the 3n evaporation channel was 8.0-(+7.4)(4.5) pb. In one of the 3n evaporation channel decay chains, a previously unobserved alpha branch in (281)Ds was observed ( probability to be of random origin from background: 0.1%). This alpha decay populated the new nucleus (277)Hs, which decayed by spontaneous fission after a lifetime of 4.5 ms.


  • Ch. E. Düllmann
  • M. Schädel
  • A. Yakushev
  • A. Türler
  • K. Eberhardt
  • J. V. Kratz
  • D. Ackermann
  • L. -L. Andersson
  • M. Block
  • W. Brüchle
  • J. Dvorak
  • H. G. Essel
  • P. A. Ellison
  • J. Even
  • J. M. Gates
  • A. Gorshkov
  • R. Graeger
  • K. E. Gregorich
  • W. Hartmann
  • R. -D. Herzberg
  • F. P. Heßberger
  • D. Hild
  • A. Huebner
  • E. Jäger
  • J. Khuyagbaatar
  • B. Kindler
  • J. Krier
  • N. Kurz
  • S. Lahiri
  • D. Liebe
  • B. Lommel
  • M. Maiti
  • H. Nitsche
  • J. P. Omtvedt
  • E. Parr
  • J. Runke
  • B. Schausten
  • E. Schimpf
  • A. Semchenkov
  • J. Steiner
  • P. Thörle-Pospiech
  • J. Uusitalo
  • M. Wegrzecki
  • N. Wiehl
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number252701
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 2010
Publication categoryResearch