Investigation of dipole strength up to the neutron-separation energy at the ELBE accelerator


Investigation of dipole strength up to the neutron-separation energy at the ELBE accelerator

Massarczyk, R.; Bemmerer, D.; Beyer, R.; Birgersson, E.; Dönau, F.; Grosse, E.; Hannaske, R.; Hartmann, A.; Junghans, A.; Kempe, M.; Kögler, T.; Matic, A.; Rusev, G.; Schilling, K.-D.; Schramm, G.; Schwengner, R.; Wagner, A.

At the bremsstrahlung facility of the ELBE accelerator there exists the possibility to investigate dipole strength distributions up to the neutronseparation energies with photon energies up to 18 MeV. The facility and various results for nuclides measured during recent years will be presented. One example is the study of 86Kr that complements a systematic study of stable isotones at the shell closure of neutron number N = 50. As a special feature, a high-pressure gas target was used in this experiment. The other presented example is an experiment on 136Ba. GEANT4 simulations were performed to detremine the non-nuclear background that has to be removed from the measured spectra. This opens up the possibility to take into account also the strength of unresolved transitions. Simulations of gamma-ray cascades were carried out that consider the transitions from states in the quasicontinuum and allow us to estimate their branching ratios. As a result, the photoabsorption cross sections obtained from corrected intensities of ground-state transitions are combined with existing data from (gamma,n) experiments and are compared with theoretical predictions.

Keywords: Nuclear structure; gamma-ray spectroscopy; gamma-ray strength functions

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  • Lecture (Conference)
    Workshop on Gamma Strength and Level Density in Nuclear Physics and Nuclear Technology, 30.08.-03.09.2010, Dresden, Deutschland

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Publ.-Id: 14532