%0 Thesis
%A Slavkovska, Zusana
%T The <sup>124</sup>Xe(p,g)<sup>125</sup>Cs Reaction Measured in Inverse Kinematics at a Storage Ring
%I Johann Wolfgang Goethe-Universität Frankfurt 
%V Dissertation
%C Frankfurt am Main
%M GSI-2019-00391
%P 129 S.
%D 2018
%Z Dissertation, Johann Wolfgang Goethe-Universität Frankfurt , 2018
%X This thesis presents the rst measurement of the proton capture reaction on the isotope124Xe performed in inverse kinematics. The experiment was carried out in June 2016 at theExperimental Storage Ring (ESR) at the GSI Helmholtz Centre for Heavy Ion Researchin Darmstadt, Germany.124Xe is one of about 35 p-nuclei that cannot be produced via neutron-induced nucleosynthesisas the vast majority of heavy elements. Its production and destruction provideimportant information about the nucleosynthesis of the p-nuclei. Measuring the124Xe(p,)125Cs reaction also gives strong constraints for its reverse 125Cs(,p)124Xe reaction.Fully stripped 124Xe ions repeatedly passed a H2 gas jet target at ve dierent energiesbetween 5.5MeV/u and 8MeV/u. An electron cooler compensated for the energy lossin the target and reduced the beam momentum spread. The reaction product 125Cs55+has a smaller magnetic rigidity than 124Xe54+. Therefore 125Cs55+ was deected towardssmaller radii in the rst dipole after the target area and thereby separated from 124Xe54+.It was detected with a position-sensitive Double-Sided Silicon Strip Detector (DSSSD).The novelty of this experiment was the installation of the DSSSD inside the ultra-highvacuum of the storage ring using a newly designed manipulator.Three High-Purity Germanium X-ray detectors were used to measure the X-rays followingthe Radiative Electron Capture (REC) events into 124Xe53+. The REC cross sections arewell-known and were used to determine the luminosity.The 124Xe(p,)125Cs cross sections at ion beam energies between 5.5MeV/u and 8MeV/uwere determined relatively to the K-REC cross sections and nally compared to the theoreticallypredicted cross sections. While theoretical predictions of the TENDL databaseare lower than the measured ones by a factor of up to seven, the NON-SMOKER dataare higher by a factor of up to two, except of the cross section at 7MeV/u, where NONSMOKERdata are slightly lower than the experimental value.For the rst time, a proton capture cross section could be measured in inverse kinematicsclose to the astrophysically relevant Gamow window. This allows the direct determinationof the (p,) cross section of isotopes with half-lives down to several minutes, which is notpossible with any other technique.
%F PUB:(DE-HGF)11
%9 Dissertation / PhD Thesis
%U https://repository.gsi.de/record/218413