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@PHDTHESIS{Naqvi:49364,
      author       = {Naqvi, Farheen},
      title        = {{P}robing the collectivity in neutron-rich {C}d isotopes
                      via gamma-ray spectroscopy},
      school       = {Universität zu Köln},
      type         = {Dr.},
      reportid     = {GSI-2013-00993},
      pages        = {139},
      year         = {2011},
      note         = {Köln, Univ., Diss., 2011; Universität zu Köln, Diss.,
                      2011},
      abstract     = {The spin and configurational structure of excited states of
                      127Cd, 125Cd and 129Cd, having two proton and three, five
                      and one neutron holes, respectively in the doubly magic
                      132Sn core have been studied. The isomeric states in Cd
                      isotopes were populated in the fragmentation of a 136Xe beam
                      at an energy of 750 MeV/u on a 9Be target of 4 g/cm2. The
                      experiment was performed at GSI Darmstadt. The neutron-rich
                      Cd isotopes were selected using the Bρ-∆E-Bρ method at
                      the FRagment Separator (FRS). Event by event identification
                      of fragments in terms of their A (mass) and Z (charge) was
                      provided by the standard FRS detectors. The reaction
                      residues were implanted in a plastic stopper surrounded by
                      15 Ge cluster detectors from the RISING array to detect the
                      gamma decays. In 127Cd, an isomeric state with a half-life
                      of 17.5(3) μs has been detected. This yrast (19/2)+ isomer
                      is proposed to have mixed proton-neutron configurations and
                      to decay by two competing stretched M2 and E3 transitions.
                      Experimental results are compared with the isotone 129Sn. In
                      125Cd, apart from the previously observed (19/2)+ isomer,
                      two new metastable states at 3896 keV and 2141 keV have been
                      detected. A half-life of 13.6(2) μs was measured for the
                      (19/2)+ isomer, having a decay structure similar to the
                      corresponding isomeric state in 127Cd. The higher lying
                      isomers have a half-life of 3.1(1) μs and 2.5(15) ns,
                      respectively. Time distributions of delayed gamma
                      transitions and gamma-gamma coincidence relations were
                      exploited to construct decay schemes for the two nuclei.
                      Comparison of the experimental data with shell-model
                      calculations is also discussed. The new information provides
                      input for the proton-neutron interaction in nuclei around
                      the doubly magic 132Sn core. The gamma decays of the
                      isomeric states in 129Cd were not observed experimentally.
                      The reasons for the non-observation of delayed gamma rays
                      for 129Cd are either an isomeric half-life of less than 93
                      ns based on the experimentally obtained isomeric ratios of
                      the (19/2)+ in 127,125Cd, or an E3 spin trap emerging from
                      shell-model calculations.},
      keywords     = {Dissertation (GND)},
      cin          = {FRS},
      cid          = {I:(DE-Ds200)FRS-20110310OR124},
      pnm          = {533 - Exotic Nuclei and Nuclear Astrophysics (ENNA)
                      (POF2-533)},
      pid          = {G:(DE-HGF)POF2-533},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:38-42079},
      url          = {https://repository.gsi.de/record/49364},
}