Dipole strength in La-139 below the neutron-separation energy
Abstract
The gamma-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 La-139 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 gamma-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
La-139 and compared with results of calculations on the basis of a quasiparticle-random-phase
approximation using an instantaneous-shape sampling.
Type
Other articleSubject
bremsstrahlung cross-sectionn=82 nuclei
process nucleosynthesis
photon-scattering
fluctuations
simulation
physics, nuclear
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https://hdl.handle.net/10161/4263Published Version (Please cite this version)
10.1103/PhysRevC.82.024314Citation
Makinaga,A.;Schwengner,R.;Rusev,G.;Doenau,F.;Frauendorf,S.;Bemmerer,D.;Beyer,R.;Crespo,P.;Erhard,M.;Junghans,A.
R.;Klug,J.;Kosev,K.;Nair,C.;Schilling,K. D.;Wagner,A.. 2010. Dipole strength in La-139
below the neutron-separation energy. Physical Review C 82(2): 24314-24314.
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