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48Ca+249Bk Fusion Reaction Leading to Element Z=117: Long-Lived α-Decaying 270Db and Discovery of 266Lr

Khuyagbaatar, J.; Yakushev, A.; Düllmann, Ch. E.; Ackermann, D.; Andersson, L.-L.; Asai, M.; Block, M.; Boll, R. A.; Brand, H. and Cox, D. M., et al. (2014) In Physical Review Letters 112(17).
Abstract
The superheavy element with atomic number Z=117 was produced as an evaporation residue in the 48Ca+249Bk 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 270Db (Z=105) was observed, which populated the new isotope 266Lr (Z=103). The identification of the long-lived (T1/2=1.0+1.9−0.4  h) α-emitter 270Db marks an... (More)
The superheavy element with atomic number Z=117 was produced as an evaporation residue in the 48Ca+249Bk 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 270Db (Z=105) was observed, which populated the new isotope 266Lr (Z=103). The identification of the long-lived (T1/2=1.0+1.9−0.4  h) α-emitter 270Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an “island of stability.” (Less)
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Physical Review Letters
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112
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17
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American Physical Society
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  • scopus:84899722109
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1079-7114
DOI
10.1103/PhysRevLett.112.172501
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English
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@article{e58e8757-8d53-4c99-8141-dfcbe56c5741,
  abstract     = {The superheavy element with atomic number Z=117 was produced as an evaporation residue in the 48Ca+249Bk 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 270Db (Z=105) was observed, which populated the new isotope 266Lr (Z=103). The identification of the long-lived (T1/2=1.0+1.9−0.4  h) α-emitter 270Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an “island of stability.”},
  articleno    = {172501},
  author       = {Khuyagbaatar, J. and Yakushev, A. and Düllmann, Ch. E. and Ackermann, D. and Andersson, L.-L. and Asai, M. and Block, M. and Boll, R. A. and Brand, H. and Cox, D. M. and Dasgupta, M. and Derkx, X. and Di Nitto, A. and Eberhardt, K. and Even, J. and Evers, M. and Fahlander, Claes and Forsberg, Ulrika and Gates, J. M. and Gharibyan, N. and Golubev, Pavel and Gregorich, K. E. and Hamilton, J. H. and Hartmann, W. and Herzberg, R.-D. and Heßberger, F. P. and Hinde, D. J. and Hoffmann, J. and Hollinger, R. and Hübner, A. and Jäger, E. and Kindler, B. and Kratz, J. V. and Krier, J. and Kurz, N. and Laatiaoui, M. and Lahiri, S. and Lang, R. and Lommel, B. and Maiti, M. and Miernik, K. and Minami, S. and Mistry, A. and Mokry, C. and Nitsche, H. and Omtvedt, J. P. and Pang, G. K. and Papadakis, P. and Renisch, D. and Roberto, J. and Rudolph, Dirk and Runke, J. and Rykaczewski, K. P. and Sarmiento, Luis and Schädel, M. and Schausten, B. and Semchenkov, A. and Shaughnessy, D. A. and Steinegger, P. and Steiner, J. and Tereshatov, E. E. and Thörle-Pospiech, P. and Tinschert, K. and Torres De Heidenreich, T. and Trautmann, N. and Türler, A. and Uusitalo, J. and Ward, D. E. and Wegrzecki, M. and Wiehl, N. and Van Cleve, S. M. and Yakusheva, V.},
  issn         = {1079-7114},
  language     = {eng},
  number       = {17},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {48Ca+249Bk Fusion Reaction Leading to Element Z=117: Long-Lived α-Decaying 270Db and Discovery of 266Lr},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.112.172501},
  volume       = {112},
  year         = {2014},
}