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@PHDTHESIS{Erbacher:218531,
      author       = {Erbacher, Philipp},
      othercontributors = {Reifarth, Rene},
      title        = {{N}ucleosynthesis of nuclei near the {N}=50 neutron shell
                      closure},
      school       = {Johann Wolfgang Goethe-Universität Frankfurt},
      type         = {Dissertation},
      reportid     = {GSI-2019-00450},
      pages        = {106 S.},
      year         = {2018},
      note         = {Dissertation, Johann Wolfgang Goethe-Universität Frankfurt
                      , 2018},
      abstract     = {Most of the elements heavier than iron are produced through
                      neutron capture reactions in the s- and r -process. The
                      overall path of the s-process is well understood and can be
                      accurately reproduced in network simulations. However, there
                      are still some neutron capture reactions of unstable nuclei
                      involved in the s-process, which were not yet measured due
                      to the difficulty in producing suitable targets. In those
                      cases, theoretical models have to be used to estimate the
                      missing cross section. One example is the branching point
                      nucleus 86Rb, whose neutron capture cross section cannot be
                      directly measured due to its short half life of 18.86 days.
                      It is, however, also possible to measure its inverse, the
                      87Rb(g,n) reaction in order to obtain the 86Rb(n,g) cross
                      section through the principle of detailed balance. Natural
                      rubidium was irradiated with a quasi-monoenergetic photon
                      beam in the energy range between 10.7 MeV and 16 MeV in
                      order to investigate the photo-dissociation cross section of
                      87Rb. The results are presented in this thesis. Not only the
                      total cross section of 87Rb(g,n), but also the partial
                      production cross section of the ground and isomeric state of
                      84Rb through the 85Rb(g,n) reaction was measured. Not all
                      isotopes can be reached via neutron capture reaction, and
                      are therefore bypassed by the s- and r -process. These 35
                      proton-rich isotopes are called p-nuclei and are produced in
                      the γ-process by a chain of photo-disintegration reactions
                      in Type II supernovae. Network calculations of Type II
                      supernova show that the γ-process can explain the
                      production of most p-nuclei, but some – especially 92/94Mo
                      and 96/98Ru – are heavily underproduced. While this could
                      be the result of deficiencies in the corresponding stellar
                      models or insufficient knowledge of the involved reaction
                      rates, it is also possible that the missing p-nuclei are
                      synthesized in other production scenarios. An alternative
                      scenario for 92Mo is the production via a chain of proton
                      capture reactions in Type Ia supernovae. One important
                      reaction in this chain is the 90Zr(p,g) reaction. The
                      reaction cross section was already measured several times,
                      but the results were inconclusive. In the present work, the
                      90 Zr(p,g) reaction was measured using the in-beam gamma-ray
                      spectroscopy technique and the discrepancies between the
                      data sets could be largely explained.},
      cin          = {KRA},
      cid          = {I:(DE-Ds200)KRA-20150901OR349},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF3-612) /
                      R3Bsetup-detectors - R3B Setup/Detektoren
                      (R3Bsetup-detectors)},
      pid          = {G:(DE-HGF)POF3-612 / G:(DE-Ds200)R3Bsetup-detectors},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hebis:30:3-471824},
      url          = {https://repository.gsi.de/record/218531},
}