Samenvatting
The superheavy element with atomic number Z = 117 was produced as an evaporation residue in the Ca-48 + Bk-249 fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their alpha-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-mu s and a few days. Two decay chains comprising seven a decays and a spontaneous fission each were identified and are assigned to the isotope (294)117 and its decay products. A hitherto unknown alpha-decay branch in (270)Db (Z = 105) was observed, which populated the new isotope Lr-266 (Z = 103). The identification of the long-lived (T-1/2 = 1.0(-0.4)(+1.9) h) alpha-emitter (270)Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an "island of stability."
Originele taal-2 | English |
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Artikelnummer | 172501 |
Aantal pagina's | 5 |
Tijdschrift | Physical Review Letters |
Volume | 112 |
Nummer van het tijdschrift | 17 |
DOI's | |
Status | Published - 1-mei-2014 |
Extern gepubliceerd | Ja |