Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Ytterbium (Z=70)
  168Yb   170Yb   171Yb   172Yb   173Yb   174Yb   175Yb   176Yb
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
176Yb 177Yb




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.3115.8 ± 2.0--
0.0116 ± 2--

(Version 0.0 corresponds to Bao et al.)
Comment
No significant change in recommended cross section. New value is weighted average of JM08 and WVA98c
Last review: July 9th, 2009
List of all available values
originalrenorm.yeartypeCommentRef
113 ± 10
2008 cVdG, Act., Au:RaK88; energy dep. from jeff30AJM08
115.9 ± 2.0
1998cVdG, TOF, Au:RaK88,Mac82eWVK98c,WVA00
136 ± 11
1992cVdG, TOF, Au+Ag+Nd+etc.:Sat.BKP92
111 ± 11
1031974bVdG, TOF, 10B:Mag75,SPU71, Au:628mb(kT=30keV)SKP74b
208 ± 40
1968bVdG, Act., 235U:Whi65SSK68
200 ± 50
1971eAGM71
127
2000tRaT99
152
1981tHar81
183
1976tHWF76
142
2002tMOST 2002Gor02
118
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
bCalculated from smooth cross sections with model fit: ln(sigma) = a + a1 ln(E) + a2 ln^2(E)
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
295
213
172
147
129
116 ± 2
96
82
72
58
50
SEF1.001.001.011.041.081.121.201.281.361.511.65
Rate
1.75
1.79
1.79
1.82
1.85
1.89
1.94
1.97
2.01
2.07
2.19

MACS:
Reference: WVK98c
Procedure: 'e' (The Maxwellian-averaged cross sections (MACS) from kT=5 keV to 100 keV are obtained from experimental data; the relative uncertainties are similar to those quoted for the 30 keV data.)
Year: 1998

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
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
175Lu
97.41
1146 mb
176Lu
37.61x109 y
1532 mb, β-
177Lu
6.65 d
β-
178Lu
28.40 m
β-
179Lu
4.59 h
β-
174Yb
31.83
151 mb
175Yb
4.18 d
558 mb, β-
176Yb
12.76
115.8 mb
177Yb
1.91 h
β-
178Yb
1.23 h
β-
173Tm
8.24 h
β-
174Tm
5.40 m
β-
175Tm
15.20 m
β-
176Tm
1.90 m
β-
177Tm
1.50 m
β-
172Er
2.05 d
β-
173Er
1.40 m
β-
174Er
3.20 m
β-
175Er
1.20 m
β-
176Er
20.00 s
β-
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Isotope: Ytterbium
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