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)
186W 187W




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.3235 ± 9--
0.0176 ± 5--

(Version 0.0 corresponds to Bao et al.)
Comment
New rec. cross section is weighted average of MDD09b and BPS79.
Last review: July 9th, 2009
List of all available values
originalrenorm.yeartypeCommentRef
234 ± 12
2009cVdG, Act., Au:RaK88MDD09b
176 ± 5
1983bLinac, TOF, 6Li, Au:Sat.MDA83
221 ± 12
2351979cF.N.B., Act., 1/v(E), Au:621mb(24keV)BPS79
220 ± 20
1971eAGM71
182.7
2006eendfb7
187.6
2004ejeff31
187.6
2002ejendl33
169
2000tRaT99
136 ± 28
1991tKJB91
194
1981tHar81
251
1976tHWF76
203
2002tMOST 2002Gor02
166
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
602
376
302
266
246
235 ± 9
205
198
184
162
146
SEF1.001.001.001.001.011.021.051.091.131.231.32
Rate
3.57
3.15
3.10
3.16
3.29
3.48
3.61
4.05
4.28
4.71
5.13

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
up
left
186Os
1.59
422 mb
187Os
1.6
896 mb
188Os
13.29
399 mb
189Os
16.21
1168 mb
190Os
26.36
274 mb
185Re
37.4
1535 mb
186Re
3.72 d
1550 mb, β-
187Re
41.20x109 y
1160 mb, β-
188Re
17.00 h
β-
189Re
1.01 d
β-
184W
30.64
223 mb
185W
75.10 d
703 mb, β-
186W
28.43
235 mb
187W
23.72 h
β-
188W
69.78 d
β-
183Ta
5.10 d
β-
184Ta
8.70 h
β-
185Ta
49.40 m
β-
186Ta
10.50 m
β-
187Ta
2.00 m
β-
182Hf
8.90 Ma
117 mb, β-
183Hf
1.07 h
β-
184Hf
4.12 h
β-
185Hf
3.50 m
β-
186Hf
2.60 m
β-
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Isotope: Tungsten
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