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@MISC{Schausten:68157,
      author       = {Düllmann, Christoph Emanuel and Yakushev, Alexander and
                      Rudolph, D.},
      othercontributors = {Schausten, Brigitta},
      title        = {{C}over of the {GSI} {S}cientific {R}eport 2014-1},
      reportid     = {GSI-2014-02565, GSI Report 2014-1},
      year         = {2014},
      abstract     = {The cover shows the set-up and the key results of the
                      element $Z=115$ experiment conducted at GSI's gas-filled
                      recoil separator TASCA. The $\alpha$-photon coincidence
                      spectroscopy set-up TASISpec consists of a box of pixelated
                      Si-detectors with surrounding composite Ge-detectors
                      (schematic representation top right). This setup allows
                      detecting superheavy nuclei via their implantation and
                      subsequent nuclear decay and their direct identification by
                      measuring characteristic $X$ rays. \\For the experiment an
                      intense $^{48}$Ca beam provided by the UNILAC accelerator
                      impinged on a radioactive $^{243}$Am target wheel placed at
                      the entrance to TASCA (photo bottom left). 30 correlated
                      $\alpha$-decay chains, assigned to element 115, were
                      registered in TASISpec within three weeks. Twenty-two of
                      them originated from the isotope with mass number 288
                      (average values given in the displayed chain at the
                      diagonal). Observed $\alpha$-photon coincidences (black
                      histograms, upper left) include two $K$ $X$-ray candidates
                      along the decay chain, the energies of which are compatible
                      with the assignment of the chains to element $Z=115$.
                      Further coincidences led for the first time to detailed
                      decay schemes (lower right) of superheavy elements near the
                      predicted 'Island of Stability'. The $E1$ $\gamma$ rays in
                      $^{276}$Mt give rise to significant constraints on nuclear
                      structure models. A complex, but in parts still tentative,
                      decay scheme of $^{272}$Bh can explain the emission of the
                      two $K$ $X$-ray candidates. Detailed GEANT4 Monte-Carlo
                      simulations (see TASISpec scheme, top right) were employed
                      for the first time in an experiment on such superheavy
                      nuclei. They allow for a crucial self-consistency check of
                      the interpretation (decay schemes, bottom right) of the
                      measured data (spectra, green curves, top left).\\This
                      experiment was selected by the American Physics Society as
                      one of the top ten 'Physics Newsmakers of the Year 2013'.},
      cin          = {SHC / BUD},
      cid          = {I:(DE-Ds200)SHC-20090422OR109 /
                      I:(DE-Ds200)BUD-20051214OR030},
      pnm          = {533 - Exotic Nuclei and Nuclear Astrophysics (ENNA)
                      (POF2-533)},
      pid          = {G:(DE-HGF)POF2-533},
      typ          = {PUB:(DE-HGF)14},
      doi          = {10.15120/GR-2014-1-C},
      url          = {https://repository.gsi.de/record/68157},
}