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Low-energy tail of the giant dipole resonance in Mo 98 and Mo 100 deduced from photon-scattering experiments

Low-energy tail of the giant dipole resonance in Mo 98 and Mo 100 deduced from photon-scattering... Dipole-strength distributions in the nuclides Mo 98 and Mo 100 up to the neutron-separation energies have been studied in photon-scattering experiments at the bremsstrahlung facility of the Forschungszentrum Dresden-Rossendorf. To determine the dipole-strength distributions up to the neutron-emission thresholds, statistical methods were developed for the analysis of the measured spectra. The measured spectra of scattered photons were corrected for detector response and atomic background by simulations using the code GEANT 3. Simulations of γ -ray cascades were performed to correct the intensities of the transitions to the ground state for feeding from higher-lying levels and to determine their branching ratios. The photoabsorption cross sections obtained for Mo 98 and Mo 100 from the present ( γ , γ ' ) experiments are combined with ( γ , n ) data from literature, resulting in a photoabsorption cross section covering the range from 4 to about 15 MeV of interest for network calculations in nuclear astrophysics. Novel information about the low-energy tail of the giant dipole resonance and its energy dependence is derived. The photoabsorption cross sections deduced from the present photon-scattering experiments are compared with existing data from neutron capture and He 3 -induced reactions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Low-energy tail of the giant dipole resonance in Mo 98 and Mo 100 deduced from photon-scattering experiments

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2008 The American Physical Society
ISSN
1089-490X
DOI
10.1103/PhysRevC.77.064321
Publisher site
See Article on Publisher Site

Abstract

Dipole-strength distributions in the nuclides Mo 98 and Mo 100 up to the neutron-separation energies have been studied in photon-scattering experiments at the bremsstrahlung facility of the Forschungszentrum Dresden-Rossendorf. To determine the dipole-strength distributions up to the neutron-emission thresholds, statistical methods were developed for the analysis of the measured spectra. The measured spectra of scattered photons were corrected for detector response and atomic background by simulations using the code GEANT 3. Simulations of γ -ray cascades were performed to correct the intensities of the transitions to the ground state for feeding from higher-lying levels and to determine their branching ratios. The photoabsorption cross sections obtained for Mo 98 and Mo 100 from the present ( γ , γ ' ) experiments are combined with ( γ , n ) data from literature, resulting in a photoabsorption cross section covering the range from 4 to about 15 MeV of interest for network calculations in nuclear astrophysics. Novel information about the low-energy tail of the giant dipole resonance and its energy dependence is derived. The photoabsorption cross sections deduced from the present photon-scattering experiments are compared with existing data from neutron capture and He 3 -induced reactions.

Journal

Physical Review CAmerican Physical Society (APS)

Published: Jun 1, 2008

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