Search for Weak Side Branches in the Electromagnetic Decay Paths of the 6526-keV 10<inline-formula><math display="inline"><semantics><msup><mrow/><mo>+</mo></msup></semantics></math></inline-formula> Isomer in <sup>54</sup>Fe
Paul Böhm,
Yuliia Hrabar,
Dirk Rudolph,
Pavel Golubev,
Luis G. Sarmiento,
Helena M. Albers,
John T. Anderson,
Michael A. Bentley,
Michael P. Carpenter,
Christopher J. Chiara,
Patrick A. Copp,
Ulrika Forsberg,
Tianheng Huang,
Heshani Jayatissa,
Torben Lauritsen,
Claus Müller-Gatermann,
Xesus Pereira-Lopez,
Walter Reviol,
Darek Seweryniak,
Sanna Stolze,
Sivahami Uthayakumaar,
Gemma L. Wilson,
Jin Wu
Affiliations
Paul Böhm
Department of Physics, Lund University, S-22100 Lund, Sweden
Yuliia Hrabar
Department of Physics, Lund University, S-22100 Lund, Sweden
Dirk Rudolph
Department of Physics, Lund University, S-22100 Lund, Sweden
Pavel Golubev
Department of Physics, Lund University, S-22100 Lund, Sweden
Luis G. Sarmiento
Department of Physics, Lund University, S-22100 Lund, Sweden
Helena M. Albers
GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
John T. Anderson
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Michael A. Bentley
Department of Physics, University of York, Heslington, York YO10 5DD, UK
Michael P. Carpenter
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Christopher J. Chiara
U.S. Army Combat Capabilities Development Command Army Research Laboratory, Adelphi, MD 20783, USA
Patrick A. Copp
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Ulrika Forsberg
Department of Physics, Lund University, S-22100 Lund, Sweden
Tianheng Huang
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Heshani Jayatissa
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Torben Lauritsen
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Claus Müller-Gatermann
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Xesus Pereira-Lopez
Department of Physics, University of York, Heslington, York YO10 5DD, UK
Walter Reviol
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Darek Seweryniak
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Sanna Stolze
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Sivahami Uthayakumaar
Department of Physics, University of York, Heslington, York YO10 5DD, UK
Gemma L. Wilson
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Jin Wu
Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
High-spin nuclear isomers in N≈Z nuclei between doubly magic 40Ca and 56Ni provide an excellent testing ground for the nuclear shell model and questions related to isospin symmetry breaking in the vicinity of the proton drip line. The purpose of the present study is to investigate the possibility of weak electromagnetic decay branches along the decay paths of the 6526-keV 10+ isomer in 54Fe. The isomer was strongly populated by means of the fusion-evaporation reaction 24Mg(36Ar,α2p)54mFe. The Gammasphere array was used to detect γ-ray cascades emitted from the isomeric state. By means of γγγ coincidences, weak non-yrast decay branches can be discriminated, with the isomer’s half-life confirmed at T1/2=363(4) ns. The yrast 61+→21+ E4 cross-over transition was interrogated. The observations are compared with shell-model calculations.
