Physics – Nuclear Physics
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvc..82b4314m&link_type=abstract
Physical Review C, vol. 82, Issue 2, id. 024314
Physics
Nuclear Physics
6
Photoproduction Reactions, Statistical Compound-Nucleus Reactions, Nuclear Physics Aspects Of Novae, Supernovae, And Other Explosive Environments, 90<=A<=149
Scientific paper
The γ-ray strength function is an important input quantity for the determination of the photoreaction rate and the neutron capture rate for astrophysics as well as for nuclear technologies. To test model predictions, the photoabsorption cross section of La139 up to the neutron-separation energy was measured using bremsstrahlung produced at the electron accelerator ELBE of Forschungszentrum Dresden-Rossendorf with an electron beam of 11.5 MeV kinetic energy. The experimental data were analyzed by applying Monte Carlo simulations of γ-ray cascades to obtain the intensities of the ground-state transitions and their branching ratios. We found a significant enhancement of electric dipole strength in the energy range from 6 to 10 MeV that may be related with a pygmy dipole resonance. The present data are combined with photoneutron cross sections for La139 and compared with results of calculations on the basis of a quasiparticle-random-phase approximation using an instantaneous-shape sampling.
Bemmerer Daniel
Beyer Roland
Crespo P.
Do"nau F.
Erhard Markus
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