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)
180W 181W




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.0656 ± 64--
0.3660 ± 53--
0.0536 ± 60--

(Version 0.0 corresponds to Bao et al.)
Comment
Rec. value is from MDD09c, recalculated with normalized average of evaluated libraries (jeff30A,endfb71,jendl40). Uncertainty in MACS vs. kT table is 8.5% from MDD09c at kT= 30 keV, then additionally extrapolated from deviation between libraries.
Last review: January 2014
List of all available values
originalrenorm.yeartypeCommentRef
656 ± 64
2009,2013rVdG, Act., Au:RaK88; en.dep. from jeff30A,endfb71,jendl40MDD09c
660 ± 53
2009cVdG, Act., Au:RaK88; en.dep. only from jeff30AMDD09c
532 ± 24
E(n)= 30 (2) keV
1987cVdG, TOF, 7Li(p,n); Au+Ag+Nd+Ta+W:Sat.BKK87
562.1
2011eENDF/B-VII.1endfb71
562
2011eJENDL-4.0jendl40
673.1
2005eJEFF-3.0Ajeff30A
270
1971sAGM71
747
2005tMOST 2005Gor05
718
2002tMOST 2002Gor02
707
2000tNON-SMOKERRaT99
522 ± 105
1991tFrom Table 8 in KJB91KJB91
646
1981tHar81
1090
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
eEvaluated value taken directly from the reference
sSemiempirical estimates given in the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
1625 ± 165
-
1093 ± 105
894 ± 83
784 ± 71
711 ± 62
656 ± 64
575 ± 57
517 ± 59
472 ± 60
408 ± 63
365 ± 67
Xfactor1.001.001.000.990.960.890.800.640.510.420.300.23
SEF1.001.001.001.001.021.041.071.141.201.241.321.40
Rate
9.64
-
9.17
9.21
9.45
9.80
10.21
10.97
11.58
12.05
12.81
13.50

MACS:
Reference: MDD09c,jeff30A,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
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