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
Go to isotope
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-
right
down
Style: (Size: S, M, L, XL, Alberto; No-Macs: nox)


Isotope: Ytterbium