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

Journal Article · Sun Jun 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.064321· OSTI ID:21191949

Rusev, G; Schwengner, R; Doenau, F; Erhard, M; Junghans, A R; Kosev, K; Schilling, K D; Wagner, A ^[1]; Grosse, E ^[1]; Becvar, F; Krticka, M ^[2]

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1. Institut fuer Strahlenphysik, Forschungszentrum Dresden-Rossendorf, D-01314 Dresden (Germany)
2. Faculty of Mathematics and Physics, Charles University, CZ-18000 Prague 8 (Czech Republic)

Dipole-strength distributions in the nuclides {sup 98}Mo and {sup 100}Mo 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 GEANT3. Simulations of {gamma}-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 {sup 98}Mo and {sup 100}Mo from the present ({gamma},{gamma}{sup '}) experiments are combined with ({gamma},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 {sup 3}He-induced reactions.

• OSTI ID: 21191949
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 77, Issue 6; Other Information: DOI: 10.1103/PhysRevC.77.064321; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASTROPHYSICS
BRANCHING RATIO
BREMSSTRAHLUNG
CAPTURE
CROSS SECTIONS
DIPOLES
DISTRIBUTION
ENERGY DEPENDENCE
GAMMA RADIATION
GIANT RESONANCE
GROUND STATES
HELIUM 3
MEV RANGE
MOLYBDENUM 100
MOLYBDENUM 98
NEUTRON EMISSION
NEUTRON REACTIONS
NEUTRON SEPARATION ENERGY
PHOTONS
SCATTERING
SIMULATION
SPECTRA