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)
174Hf 175Hf




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.2983 ± 46--
0.0956 ± 283*--

(Version 0.0 corresponds to Bao et al.)
Comment
Previous MACS vs. kT table multiplied by 1.028.
Last review: January 24th, 2007
List of all available values
originalrenorm.yeartypeCommentRef
983 ± 46
2007cVdG, Act., Au:RaK88VDH07
800
1971sAGM71
686.4
2006eendfb7
952.3
2004ejeff31
951.8
2002ejendl33
786
2000tRaT99
1182
1981tHar81
1170
1976tHWF76
705
2002tMOST 2002Gor02
759
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
sSemiempirical estimates given in the reference
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
2522
1477
1253
1131
1048
983 ± 46
887
820
767
693
643
SEF1.001.001.011.031.061.101.181.231.281.361.43
Rate
1.50
1.24
1.30
1.38
1.48
1.58
1.75
1.90
2.02
2.23
2.43

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 108 cm3/mole/s, including SEF
Isotopic mass chain
Isotopic Mass Chain
Chart of nuclei
up
left
174W
33.20 m
β+
175W
35.20 m
β+
176W
2.50 h
β+
177W
2.20 h
β+
178W
21.60 d
β+
173Ta
3.14 h
β+
174Ta
1.14 h
β+
175Ta
10.50 h
β+
176Ta
8.09 h
β+
177Ta
2.36 d
β+
172Hf
1.87 a
β+
173Hf
23.60 h
β+
174Hf
0.16
956 mb
175Hf
70.00 d
β+
176Hf
5.26
455 mb
171Lu
8.24 d
β+
172Lu
6.70 d
β+
173Lu
1.37 a
β+
174Lu
3.31 a
β+
175Lu
97.41
1146 mb
170Yb
3.04
768 mb
171Yb
14.28
1210 mb
172Yb
21.83
341 mb
173Yb
16.13
754 mb
174Yb
31.83
151 mb
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Isotope: Hafnium
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