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)
168Yb 169Yb




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.31214 ± 49--
0.01160 ± 440*--

(Version 0.0 corresponds to Bao et al.)
Comment
Last review: July 9th, 2009
List of all available values
originalrenorm.yeartypeCommentRef
1214 ± 49
2009cVdG, Act., Au:RaK88MDD09c
700
1971sAGM71
886
2000tRaT99
971 ± 320
1988tZZC88
1008
1981tHar81
1110
1976tHWF76
912
2002tMOST 2002Gor02
871
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
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
2997
2046
1681
1470
1325
1214 ± 49
1053
937
850
728
649
SEF1.001.001.011.031.061.101.181.241.291.361.42
Rate
1.78
1.72
1.74
1.79
1.87
1.95
2.08
2.18
2.25
2.35
2.45

MACS:
Reference: MDD09c,jeff31
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: 2009

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
168Hf
25.95 m
β+
169Hf
3.24 m
β+
170Hf
16.01 h
β+
171Hf
12.10 h
β+
172Hf
1.87 a
β+
167Lu
51.50 m
β+
168Lu
5.50 m
β+
169Lu
1.42 d
β+
170Lu
2.01 d
β+
171Lu
8.24 d
β+
166Yb
2.36 d
β+
167Yb
17.50 m
β+
168Yb
0.13
1214 mb
169Yb
32.02 d
β+
170Yb
3.04
768 mb
165Tm
1.25 d
β+
166Tm
7.70 h
β+
167Tm
9.25 d
β+
168Tm
93.10 d
β+
169Tm
100
1129 mb
164Er
1.601
1084 mb
165Er
10.36 h
β+
166Er
33.503
563 mb
167Er
22.869
1425 mb
168Er
26.978
338 mb
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Isotope: Ytterbium
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