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   187W   188W
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
182W 183W




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.0285 ± 11--
0.0274 ± 8--

(Version 0.0 corresponds to Bao et al.)
Comment
Rec. value is average of recent evaluations (endfb71,jendl40). Uncertainty is from standard deviation of ca. 4% given in endfb71.
Last review: January 2014
List of all available values
originalrenorm.yeartypeCommentRef
286 ± 13
E(n)= 30 (2) keV
1987cVdG, TOF, 7Li(p,n); Au+Ag+Nd+Ta+W:Sat.BKK87
274 ± 8
1983bLinac, TOF, 6Li, Au:Sat.MDA83
322
1969cLinac, TOF, 6Li, Au:Sat., quoted from BKW82BHM69
292 ± 11
2011eENDF/B-VII.1 incl. standard deviationendfb71
278.5
2011eJENDL-4.0jendl40
303.1
2006eENDF/B-VII.0endfb7
274.1
2004eJEFF-3.1jeff31
274.1
2002eJENDL-3.3jendl33
260 ± 30
1971eAGM71
405
2005tMOST 2005Gor05
441
2002tMOST 2002Gor02
394
2000tNON-SMOKERRaT99
358 ± 46
1991tKJB91
365
1981tHar81
448
1976tHWF76


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
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
785 ± 25
-
499 ± 18
400 ± 15
347 ± 13
312 ± 12
285 ± 11
246 ± 10
218 ± 9
197 ± 8
167 ± 7
148 ± 6
Xfactor1.001.001.000.990.950.880.790.620.490.400.280.21
SEF1.001.001.001.001.011.041.071.141.201.261.371.46
Rate
4.65
-
4.18
4.12
4.18
4.30
4.43
4.70
4.91
5.10
5.41
5.75

MACS:
Reference: endfb71,jendl40
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: 2013

X-factor:
Reference: Rau12
Year: 2012

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

Rate:
Reaction rate NA<σv> given in 107 cm3/mole/s, including SEF
Chart of nuclei
Style: (S, M, L, XL or Alberto)


Isotope: Tungsten