Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Erbium (Z=68)
  162Er   164Er   166Er   167Er   168Er   169Er   170Er
Go to isotope
Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
167Er 168Er




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.01425 ± 143--

(Version 0.0 corresponds to Bao et al.)
Comment
Last review: 1999
List of all available values
originalrenorm.yeartypeCommentRef
1538 ± 154
14251974bVdG, TOF, 10B:SPU71, Au:628mb(kT=30keV)SKP74a
2000
1971sAGM71
1559
2006eendfb7
1566
2004ejeff31
1566
2002ejendl33
1403
2000tRaT99
1765
1981tHar81
1830
1976tHWF76
2577
2002tMOST 2002Gor02
1043
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:
bCalculated from smooth cross sections with model fit: ln(sigma) = a + a1 ln(E) + a2 ln^2(E)
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
4457
2817
2192
1824
1588
1425 ± 143
1217
1097
1021
933
885
SEF1.001.001.000.990.990.980.970.970.960.940.92
Rate
2.64
2.36
2.25
2.15
2.08
2.04
1.99
1.99
2.02
2.09
2.16

MACS:
Reference: SKP74a
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: 1974

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
167Yb
17.50 m
β+
168Yb
0.13%
1214 mb
169Yb
32.02 d
β+
170Yb
3.04%
768 mb
171Yb
14.28%
1210 mb
166Tm
7.70 h
β+
167Tm
9.25 d
β+
168Tm
93.10 d
β+
169Tm
100%
1129 mb
170Tm
128.59 d
1870 mb, β-
165Er
10.36 h
β+
166Er
33.503%
563 mb
167Er
22.869%
1425 mb
168Er
26.978%
338 mb
169Er
9.39 d
653 mb, β-
164Ho
29.00 m
β+
165Ho
100%
1280 mb
166Ho
1.12 d
β-
167Ho
3.00 h
β-
168Ho
2.99 m
β-
163Dy
24.9%
1112 mb
164Dy
28.18%
212 mb
165Dy
2.33 h
β-
166Dy
3.40 d
β-
167Dy
6.20 m
β-
right
down
Style: (Size: S, M, L, XL, Alberto; No-Macs: nox)


Isotope: Erbium