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Dipole strength in La-139 below the neutron-separation energy

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Date
2010
Authors
Makinaga, A
Schwengner, R
Rusev, G
Dönau, F
Frauendorf, S
Bemmerer, D
Beyer, R
Crespo, P
Erhard, M
Junghans, AR
Klug, J
Kosev, K
Nair, C
Schilling, KD
Wagner, A
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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 article
Subject
bremsstrahlung cross-section
n=82 nuclei
process nucleosynthesis
photon-scattering
fluctuations
simulation
physics, nuclear
Permalink
https://hdl.handle.net/10161/4263
Published Version (Please cite this version)
10.1103/PhysRevC.82.024314
Citation
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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