Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
[Standards]   [Logbook]   [FAQ]   [Links]   [Disclaimer]   [Contact]
p-process
Available isotopes for Tungsten (Z=74)
  180W   182W   183W   184W   185W   186W
Go to isotope
Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
185W 186W




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.3584 ± 53--
0.2687 ± 110--
0.0703 ± 113*--

(Version 0.0 corresponds to Bao et al.)
Comment
New recommended value is weighted average of MSU04 and SMV03. MACS vs. kT table from Bao 2000 multiplied by 0.830.
Last review: January 24th, 2007
List of all available values
originalrenorm.yeartypeCommentRef
553 ± 60
2004cLaser Compton Scattering, Photoact.; from W-186(gamma,n)MSU04
687 ± 110
2003cS-DALINAC, Photoact.; from W-186(gamma,n)SMV03
663
2000tRaT99
532 ± 75
1991tKJB91
794
1976tHWF76
338
2002tMOST 2002Gor02
585
2005tMOST 2005Gor05


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
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
1647
1108
880
745
653
584 ± 53
486
418
369
299
252
SEF1.000.980.950.940.920.920.910.920.940.991.04
Rate
9.75
9.08
8.62
8.27
7.99
7.77
7.44
7.23
7.14
7.01
6.94

MACS:
Reference: MSU04,SMV03,RaT99
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: 2000,2003,2004

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

Rate:
Reaction rate NA<σv> given in 107 cm3/mole/s, including SEF
Isotopic mass chain
Isotopic Mass Chain
Chart of nuclei
up
left
185Os
93.60 d
β+
186Os
1.59
422 mb
187Os
1.6
896 mb
188Os
13.29
399 mb
189Os
16.21
1168 mb
184Re
38.00 d
β+
185Re
37.4
1535 mb
186Re
3.72 d
1550 mb, β-
187Re
41.20x109 y
1160 mb, β-
188Re
17.00 h
β-
183W
14.31
515 mb
184W
30.64
223 mb
185W
75.10 d
703 mb, β-
186W
28.43
235 mb
187W
23.72 h
β-
182Ta
114.43 d
1120 mb, β-
183Ta
5.10 d
β-
184Ta
8.70 h
β-
185Ta
49.40 m
β-
186Ta
10.50 m
β-
181Hf
42.39 d
194 mb, β-
182Hf
8.90 Ma
117 mb, β-
183Hf
1.07 h
β-
184Hf
4.12 h
β-
185Hf
3.50 m
β-
right
down
Style: (Size: S, M, L, XL, Alberto; No-Macs: nox)


Isotope: Tungsten
This page is not optimized for Microsoft Internet Explorer.