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. 2014 May 2;112(17):172501.
doi: 10.1103/PhysRevLett.112.172501. Epub 2014 May 1.

48Ca+249Bk fusion reaction leading to element Z = 117: long-lived α-decaying 270Db and discovery of 266Lr

J Khuyagbaatar  1 , A Yakushev  2 , Ch E Düllmann  3 , D Ackermann  2 , L-L Andersson  4 , M Asai  5 , M Block  2 , R A Boll  6 , H Brand  2 , D M Cox  7 , M Dasgupta  8 , X Derkx  9 , A Di Nitto  10 , K Eberhardt  9 , J Even  4 , M Evers  8 , C Fahlander  11 , U Forsberg  11 , J M Gates  12 , N Gharibyan  13 , P Golubev  11 , K E Gregorich  12 , J H Hamilton  14 , W Hartmann  2 , R-D Herzberg  7 , F P Heßberger  1 , D J Hinde  8 , J Hoffmann  2 , R Hollinger  2 , A Hübner  2 , E Jäger  2 , B Kindler  2 , J V Kratz  10 , J Krier  2 , N Kurz  2 , M Laatiaoui  4 , S Lahiri  15 , R Lang  2 , B Lommel  2 , M Maiti  15 , K Miernik  6 , S Minami  2 , A Mistry  7 , C Mokry  9 , H Nitsche  12 , J P Omtvedt  16 , G K Pang  12 , P Papadakis  17 , D Renisch  10 , J Roberto  6 , D Rudolph  11 , J Runke  2 , K P Rykaczewski  6 , L G Sarmiento  11 , M Schädel  18 , B Schausten  2 , A Semchenkov  16 , D A Shaughnessy  13 , P Steinegger  19 , J Steiner  2 , E E Tereshatov  13 , P Thörle-Pospiech  9 , K Tinschert  2 , T Torres De Heidenreich  2 , N Trautmann  10 , A Türler  19 , J Uusitalo  20 , D E Ward  11 , M Wegrzecki  21 , N Wiehl  9 , S M Van Cleve  6 , V Yakusheva  4
Affiliations

48Ca+249Bk fusion reaction leading to element Z = 117: long-lived α-decaying 270Db and discovery of 266Lr

J Khuyagbaatar et al. Phys Rev Lett. .

Abstract

The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope (294)117 and its decay products. A hitherto unknown α-decay branch in (270)Db (Z = 105) was observed, which populated the new isotope (266)Lr (Z = 103). The identification of the long-lived (T(1/2) = 1.0(-0.4)(+1.9) h) α-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."

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