Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Tungsten (Z=74)
  180W   182W   183W   184W   185W   186W
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
184W 185W




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.3223 ± 5--
0.0224 ± 10--

(Version 0.0 corresponds to Bao et al.)
Comment
New rec. cross section is weighted average of MDD09b,MDA83, and BKW82.
Last review: July 9th, 2009
List of all available values
originalrenorm.yeartypeCommentRef
222 ± 15
2009cVdG, Act., Au:RaK88MDD09b
217 ± 6
1983bLinac, TOF, 6Li, Au:Sat.MDA83
256 ± 10
2381982cVdG, TOF, Au:B-IVBKW82
222.4
2006eendfb7
203.4
2004ejeff31
203.4
2002ejendl33
286 ± 38
1991tKJB91
180 ± 20
1971eAGM71
266
2000tRaT99
234
1981tHar81
314
1976tHWF76
324
2002tMOST 2002Gor02
292
2005tMOST 2005Gor05


Original:MACS [<σ v>/vT] (mb) for kT=30 keV, based on the published cross sections except where indicated otherwise.
Renorm:MACS [<σ v>/vT] (mb) for kT=30 keV for which the reference or standard cross section was meanwhile improved.
Type: The letters and numbers in the column labelled 'type' give information on how the cross section has been obtained:
cDirectly quoted from the reference itself
bCalculated from smooth cross sections with model fit: ln(sigma) = a + a1 ln(E) + a2 ln^2(E)
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
688
410
317
271
243
223 ± 5
194
173
156
132
115
SEF1.001.001.001.011.031.061.121.181.231.331.44
Rate
4.08
3.44
3.26
3.25
3.32
3.43
3.64
3.82
3.95
4.18
4.38

MACS:
Reference: MDD09b,endfb7
Procedure: 'e+t' (The MACS from kT=5 keV to 100 keV are derived from calculated cross sections, which are then normalized to experimental data, e.g. to the values at kT=25 keV obtained in activation measurements. In these cases the uncertainties should be linearly increased below 25 and above 30 keV to reach about 30% at the extreme kT values.)
Year: 2009

SEF (Stellar enhancement factor):
Reference: Rau09
Year: 2009
Comment:

Rate:
Reaction rate NA<σv> given in 107 cm3/mole/s, including SEF
Isotopic mass chain
Isotopic Mass Chain
Chart of nuclei


Isotope: Tungsten
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