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)
183W 184W




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.0574 ± 25--
0.0515 ± 15--

(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. 5% given in endfb71.
Last review: January 2014
List of all available values
originalrenorm.yeartypeCommentRef
581 ± 27
E(n)= 30 (2) keV
1987cVdG, TOF, 7Li(p,n); Au+Ag+Nd+Ta+W:Sat.BKK87
515 ± 15
1983bLinac, TOF, 6Li, Au:Sat.MDA83
550
1969cLinac, TOF, 6Li, Au:Sat., quoted from BKW82BHM69
575.3 ± 25.5
2011eENDF/B-VII.1endfb71
572.7
2011eJENDL-4.0jendl40
528.6
2006eENDF/B-VII.0endfb7
453.1
2004eJEFF-3.1jeff31
453.1
2002eJENDL-3.3jendl33
550 ± 50
1971eAGM71
681
2005tMOST 2005Gor05
1098
2002tMOST 2002Gor02
701
2000tNON-SMOKERRaT99
618 ± 75
1991tKJB91
1038
1981tHar81
1010
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
1786 ± 88
-
1131 ± 52
880 ± 39
738 ± 33
643 ± 28
574 ± 25
477 ± 21
411 ± 19
364 ± 17
298 ± 14
255 ± 12
Xfactor1.000.990.980.900.790.690.600.460.370.300.210.15
SEF1.001.001.011.021.041.061.081.131.171.201.261.31
Rate
1.06
-
0.95
0.92
0.91
0.90
0.90
0.90
0.90
0.90
0.89
0.89

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 108 cm3/mole/s, including SEF
Chart of nuclei


Isotope: Tungsten