Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-11-27
Phys.Rev.C78:064314,2008
Physics
Nuclear Physics
Nuclear Experiment
27 pages, 15 figures, to be published in PRC
Scientific paper
10.1103/PhysRevC.78.064314
The dipole response of the N=50 nucleus 90Zr was studied in photon-scattering experiments at the electron linear accelerator ELBE with bremsstrahlung produced at kinetic electron energies of 7.9, 9.0, and 13.2 MeV. We identified 189 levels up to an excitation energy of 12.9 MeV. Statistical methods were applied to estimate intensities of inelastic transitions and to correct the intensities of the ground-state transitions for their branching ratios. In this way we derived the photoabsorption cross section up to the neutron-separation energy. This cross section matches well the photoabsorption cross section obtained from (gamma,n) data and thus provides information about the extension of the dipole-strength distribution toward energies below the neutron-separation energy. An enhancement of E1 strength has been found in the range of 6 MeV to 11 MeV. Calculations within the framework of the quasiparticle-phonon model ascribe this strength to a vibration of the excessive neutrons against the N = Z neutron-proton core, giving rise to a pygmy dipole resonance.
Benouaret N.
Beyer Roland
Erhard Markus
Grosse Eckart
Junghans Arnd R.
No associations
LandOfFree
Pygmy dipole strength in 90Zr does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Pygmy dipole strength in 90Zr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pygmy dipole strength in 90Zr will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-232645