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)
184W 185W




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.0225 ± 27--
0.3223 ± 5--
0.0224 ± 10--

(Version 0.0 corresponds to Bao et al.)
Comment
Rec. value is from MDD09b, recalculated with normalized average of evaluated libraries (jeff31,endfb71,jendl40). Uncertainty in MACS vs. kT table is 5.3% from MDD09b plus standard deviation from endfb71.
Last review: January 2014
List of all available values
originalrenorm.yeartypeCommentRef
225 ± 27
2009,2013rVdG, Act., Au:RaK88; en. dep. from jeff31,endfb71,jendl40MDD09b
222 ± 15
2009cVdG, Act., Au:RaK88MDD09b
229 ± 11
E(n)= 31.5 (35) keV
1987cVdG, TOF, 7Li(p,n); Au+Ag+Nd+Ta+W:Sat.BKK87
217 ± 6
1983bLinac, TOF, 6Li, Au:Sat.MDA83
256 ± 10
2381982cVdG, TOF, Au:B-IVBKW82
252.2 ± 16.9
2011eENDF/B-VII.1 incl. standard deviationendfb71
244.2
2011eJENDL-4.0jendl40
222.4
2006eENDF/B-VII.0endfb7
203.4
2004eJEFF-3.1jeff31
203.4
2002eJENDL-3.3jendl33
286 ± 38
1991tKJB91
180 ± 20
1971eAGM71
292
2005tMOST 2005Gor05
324
2002tMOST 2002Gor02
266
2000tNON-SMOKERRaT99
234
1981tHar81
314
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:
rRecalculated for kT = 30keV with the code described in Ref. 2 after renormalizing the original data to updated standard cross sections
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
564.0 ± 29.5
-
358.0 ± 18.8
294.9 ± 15.5
262.6 ± 13.8
241.2 ± 12.7
224.7 ± 12.0
198.8 ± 11.1
178.6 ± 10.5
162.4 ± 9.9
138.4 ± 9.2
121.9 ± 8.7
Xfactor1.001.001.000.990.970.920.840.680.550.450.320.24
SEF1.001.001.001.001.011.031.061.121.181.231.331.44
Rate
3.34
-
3.00
3.03
3.15
3.30
3.46
3.73
3.94
4.11
4.38
4.64

MACS:
Reference: MDD09b,jeff31,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


Isotope: Tungsten