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
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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]
1.01000 ± 46--
0.2983 ± 46--
0.0956 ± 283*--

(Version 0.0 corresponds to Bao et al.)
Comment
Rec. value and MACS vs. kT table is from activation measurement of VDH07, recalculated with normalized (f(norm)= 1.052) energy-dependencies of endfb71,jendl40,jeff312 (these libraries differ only in the unresolved resonance region below E(n)= 0.2 keV). MACS vs. kT table is average of these libraries, with an additional small uncertainty (up to 0.3%) due to the deviation at lower energies.
Last review: January 2014
List of all available values
originalrenorm.yeartypeCommentRef
1000 ± 46
2007,2013rVdG, Act., Au:RaK88; recalc. with norm. en. dep. from endfb71,jendl40,jeff312VDH07
983 ± 46
2007cVdG, Act., Au:RaK88; norm. en. dep. from JEF 2.2VDH07
952.5
2011eENDF/B-VII.1endfb71
980.0
2011eJENDL-4.0jendl40
686.4
2006eENDF/B-VII.0endfb7
952.3
2004eJEFF-3.1jeff31
951.8
2002eJENDL-3.3jendl33
800
1971sAGM71
690 ± 210
kT= 25 keV
2007tHFSM; priv. comm. A. MengoniVDH07
1055 ± 530
kT= 25 keV
2007tCoH; priv. comm. T. KawanoVDH07
797
kT= 25 keV
2007tTALYS; priv. comm. A. KoningVDH07
1721
kT= 25 keV
2007tEMPIRE; priv. comm. M. HermanVDH07
759
2005tMOST 2005Gor05
705
2002tMOST 2002Gor02
786
2000tNON-SMOKERRaT99
1182
1981tHar81
1170
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
2562 ± 124
-
1670 ± 78
1351 ± 63
1183 ± 55
1076 ± 50
1000 ± 46
893 ± 41
820 ± 38
765 ± 35
687 ± 32
634 ± 29
Xfactor1.001.001.000.980.920.830.730.560.440.360.260.20
SEF1.001.001.001.011.031.061.101.181.231.281.361.43
Rate
1.52
-
1.40
1.40
1.44
1.52
1.60
1.76
1.90
2.01
2.21
2.40

MACS:
Reference: VDH07,endfb71,jendl40,jeff312
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: 2007,2013

X-factor:
Reference: Rau12
Year: 2012

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

Rate:
Reaction rate NA<σv> given in 108 cm3/mole/s, including SEF
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