Photoactivation experiment on 197Au and its implications for the dipole strength in heavy nuclei

Abstract

The 197Au(gamma,n) reaction is used as an activation standard for photodisintegration studies on astrophysically relevant nuclei. At the bremsstrahlung facility of the superconducting electron accelerator ELBE (Electron Linear accelerator of high Brilliance and low Emittance) of Forschungszentrum Dresden-Rossendorf, photoactivation measurements on 197Au have been performed with bremsstrahlung endpoint energies from 8.0 to 15.5 MeV. The measured activation yield is compared with previous experiments as well as with calculations using Hauser-Feshbach statistical models. It is shown that the experimental data are best described by a two-Lorentzian parametrization with taking the axial deformation of 197Au into account. The experimental 197Au(gamma,n) reaction yield measured at ELBE via the photoactivation method is found to be consistent with previous experimental data using photon scattering or neutron detection methods.

9 pages

References in corpus (9)

• Nuclear Ground-State Masses and Deformations
• Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section
• The s-process branching at 185W
• Predicted cross sections for photon-induced particle emission
• Pygmy dipole strength close to particle-separation energies - the case of the Mo isotopes
• Photoactivation at a clinical LINAC: The 197Au(gamma,n)196Au reaction slightly above threshold
• Photodissociation of p-process nuclei studied by bremsstrahlung induced activation
• Photodisintegration studies on p-nuclei: The case of Mo and Sm isotopes
• Photon strength distributions in stable even-even molybdenum isotopes

Cited by in corpus (8)

• Parameterization of Deformed Nuclei for Glauber Modeling in Relativistic Heavy Ion Collisions
• The activation method for cross section measurements in nuclear astrophysics
• Experimental study of the electric dipole strength in the even Mo nuclei and its deformation dependence
• Elliptic flow fluctuations in central collisions of spherical and deformed nuclei
• Dipole strength in 144Sm studied via (gamma,n), (gamma,p) and (gamma,alpha) reactions
• Breaking of axial symmetry in excited heavy nuclei as identified in Giant Dipole Resonance data
• Effect of broken axial symmetry on the electric dipole strength and the collective enhancement of level densities in heavy nuclei
• Consequences of broken axial symmetry in heavy nuclei -- an overview of the situation in the valley of stability