Neutron capture cross sections of {sup 184}W and {sup 186}W

Journal Article · Sat Aug 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.025804· OSTI ID:21290091

Marganiec, J; Dillmann, I; Pardo, C Domingo; Kaeppeler, F ^[1]; Gesellschaft fuer Schwerionenforschung, Darmstadt ^[2]

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1. Forschungszentrum Karlsruhe, Institut fuer Kernphysik, Karlsruhe, Germany and University of Lodz, Division of Nuclear Physics, Lodz (Poland)
2. Germany

The neutron capture cross sections of {sup 184}W and {sup 186}W have been determined by means of the activation technique. The measurements were carried out at the Karlsruhe 3.75-MV Van de Graaff accelerator using the {sup 7}Li(p,n){sup 7}Be reaction for neutron production. Samples of natural composition were irradiated in a quasistellar neutron spectrum for a thermal energy of kT=25 keV. Systematic uncertainties were investigated by variation of the experimental parameters in repeated activations. The induced activities were counted with HPGe detectors via the strongest {gamma}-ray lines in the decay of the respective product nuclei. The measured data were converted into Maxwellian averaged cross sections at kT=30 keV, yielding 221{+-}12 mb and 231{+-}11 mb for {sup 184}W and {sup 186}W, respectively. Together with the result of a previously reported measurement on {sup 180}W, the present values can be used to improve the cross-section trend with neutron number, which is important for extrapolation into the regions of unstable isotopes. These results are of interest for stellar and explosive nucleosynthesis in nuclear astrophysics as well as for technological applications.

• OSTI ID: 21290091
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 80, Issue 2; Other Information: DOI: 10.1103/PhysRevC.80.025804; (c) 2009 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
BERYLLIUM 7
CAPTURE
CROSS SECTIONS
EXTRAPOLATION
GAMMA RADIATION
HIGH-PURITY GE DETECTORS
KEV RANGE
LITHIUM 7 TARGET
NEUTRON EMISSION
NEUTRON REACTIONS
NEUTRON SPECTRA
NEUTRONS
NUCLEOSYNTHESIS
TUNGSTEN 180
TUNGSTEN 184
TUNGSTEN 186
VAN DE GRAAFF ACCELERATORS
VARIATIONS