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)
186W 187W




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.0226 ± 12--
0.3235 ± 9--
0.0176 ± 5--

(Version 0.0 corresponds to Bao et al.)
Comment
New rec. value is from MDD09b, recalculated with normalized (f(norm)= 1.18) average of evaluated libraries (endfb71,jendl40). Uncertainty in MACS vs. kT table is 4.4% from MDD09b plus deviation between libraries.
Last review: February 2014
List of all available values
originalrenorm.yeartypeCommentRef
226 ± 12
2009,2013rVdG, Act., Au:RaK88; en. dep. from jendl40,endfb71MDD09b
234 ± 12
2009cVdG, Act., Au:RaK88; en. dep. from endfb7MDD09b
179 ± 8
E(n)= 30 (2) keV
1987cVdG, TOF, 7Li(p,n); Au+Ag+Nd+Ta+W:Sat.BKK87
176 ± 5
1983bLinac, TOF, 6Li, Au:Sat.MDA83
247 ± 12
E(n)= 24.3 keV
1979cF.N.B., Act., 1/v(E), Au: 621 (3) mb (24 keV)BPS79
263 ± 28
E(n)= 23 (5) keV
1974cSb-Be, Act., 1/v(E), 127I:836 (26) mb (23 keV)SSR74
192
2011eENDF/B-VII.1endfb71
193
2011eJENDL-4.0jendl40
182.7
2006eENDF/B-VII.0endfb7
187.6
2004eJEFF-3.1jeff31
187.6
2002eJENDL-3.3jendl33
220 ± 20
1971eAGM71
166
2005tMOST 2005Gor05
203
2002tMOST 2002Gor02
169
2000tNON-SMOKERRaT99
136 ± 28
1991tKJB91
194
1981tHar81
251
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
605 ± 57
-
383 ± 28
308 ± 18
270 ± 13
245 ± 11
226 ± 12
197 ± 11
176 ± 10
159 ± 10
134 ± 7
117 ± 6
Xfactor1.001.001.001.000.990.960.910.770.640.530.380.29
SEF1.001.001.001.001.001.011.021.051.091.131.231.32
Rate
3.59
-
3.21
3.16
3.21
3.28
3.34
3.47
3.60
3.70
3.90
4.11

MACS:
Reference: MDD09b,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: 2009

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
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-
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Style: (S, M, L, XL or Alberto)


Isotope: Tungsten