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)
180W 181W




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.3660 ± 53--
0.0536 ± 60--

(Version 0.0 corresponds to Bao et al.)
Comment
Last review: July 9th, 2009
List of all available values
originalrenorm.yeartypeCommentRef
660 ± 53
2009cVdG, Act., Au:RaK88MDD09c
578 ± 60
5361987bVdG, TOF, 10B:Mag75, Au:628mb(kT=30keV)KPT87
270
1971sAGM71
707
2000tRaT99
522 ± 105
1991tKJB91
646
1981tHar81
1090
1976tHWF76
718
2002tMOST 2002Gor02
747
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)
sSemiempirical estimates given in the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
1795
1160
992
797
717
660 ± 53
582
529
489
433
369
SEF1.001.001.001.021.041.071.141.201.241.321.40
Rate
1.06
0.97
1.02
0.96
0.99
1.03
1.11
1.19
1.25
1.36
1.37

MACS:
Reference: MDD09c,RaT99
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 108 cm3/mole/s, including SEF
Isotopic mass chain
Isotopic Mass Chain
Chart of nuclei
up
left
180Os
21.50 m
β+
181Os
1.75 h
β+
182Os
22.10 h
β+
183Os
13.00 h
β+
184Os
0.02
590 mb
179Re
19.50 m
β+
180Re
2.44 m
β+
181Re
19.90 h
β+
182Re
2.67 d
β+
183Re
70.00 d
β+
178W
21.60 d
β+
179W
37.05 m
β+
180W
0.12
660 mb
181W
121.20 d
β+
182W
26.5
274 mb
177Ta
2.36 d
β+
178Ta
9.31 m
β+
179Ta
1.82 a
1334 mb, β+
180Ta
8.15 h
1640 mb, β+
181Ta
99.988
766 mb
176Hf
5.26
455 mb
177Hf
18.6
1500 mb
178Hf
27.28
314 mb
179Hf
13.62
956 mb
180Hf
35.08
179 mb
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Isotope: Tungsten
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