Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Hafnium (Z=72)
  174Hf   176Hf   177Hf   178Hf   179Hf   180Hf   181Hf   182Hf
Go to isotope
Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
182Hf 183Hf




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.2141 ± 8--
0.0117 ± 41*--

(Version 0.0 corresponds to Bao et al.)
Comment
Previous MACS vs. kT table multiplied by 1.205.
Last review: January 24th, 2007
List of all available values
originalrenorm.yeartypeCommentRef
141 ± 8
2007cVdG, Act., Au:RaK88VDH07
125
2000tRaT99
241
1981tHar81
65.9
2002tMOST 2002Gor02
53.8
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
330
229
190
169
153
141 ± 8
122
106
95
78
68
SEF1.001.001.001.021.041.071.141.211.281.421.55
Rate
1.96
1.92
1.96
2.04
2.12
2.20
2.34
2.40
2.50
2.62
2.80

MACS:
Reference: VDH07,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: 2000,2007

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
182W
26.5
274 mb
183W
14.31
515 mb
184W
30.64
223 mb
185W
75.10 d
703 mb, β-
186W
28.43
235 mb
181Ta
99.988
766 mb
182Ta
114.43 d
1120 mb, β-
183Ta
5.10 d
β-
184Ta
8.70 h
β-
185Ta
49.40 m
β-
180Hf
35.08
179 mb
181Hf
42.39 d
194 mb, β-
182Hf
8.90 Ma
117 mb, β-
183Hf
1.07 h
β-
184Hf
4.12 h
β-
179Lu
4.59 h
β-
180Lu
5.70 m
β-
181Lu
3.50 m
β-
182Lu
2.00 m
β-
183Lu
58.00 s
β-
178Yb
1.23 h
β-
179Yb
8.00 m
β-
180Yb
2.40 m
β-
181Yb
1.00 m
β-
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Isotope: Hafnium
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