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-
right
down
Style: (Size: S, M, L, XL, Alberto; No-Macs: nox)


Isotope: Tungsten