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   171Er   172Er
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
170Er 171Er




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.0170.2 ± 6.8--
0.0170 ± 7--

(Version 0.0 corresponds to Bao et al.)
Comment
New rec. value is spectrum-averaged value from BSA01 recalculated with the normalized energy-dependencies from endfb71 and jendl40 (f=0.80). Uncertainty is 3.9 % as in BSA01 plus deviation of evaluations.
Last review: November 2013
List of all available values
originalrenorm.yeartypeCommentRef
170.2 ± 6.8
1996,2013cVdG, Act., 1/v(kT), Au:RaK88; norm. en.dep. from endfb71, jendl40BSA01
170 ± 7
1996cVdG, Act., 1/v(kT), Au:RaK88Bes96
208 ± 29
E(n)= 30 (2) keV
1978cVdG, TOF, 10B:Mag75, Au:628 mb(kT= 30 keV)KYP78
144 ± 43
1331974bVdG, TOF, 10B:SPU71, Au:628 mb(kT= 30 keV)SKP74a
351 ± 42
E(n)= 23 (5) keV
1974cSb-Be, Act., 1/v(E), 127I:836 mb (23 keV)SSR74
275 ± 35
E(n)= 30.8 (55) keV
1968cVdG, Act., 235U:Whi65SSK68
216.1 ± 43.2
2011eENDF/B-VII.1 incl. covariancesendfb71
207.3
2011eJENDL-4.0jendl40
207.3
2004eJEFF-3.1jeff31
207.3
2002eJENDL-3.3jendl33
250 ± 30
1971eAGM71
154
2005tMOST 2005Gor05
195
2002tMOST 2002Gor02
158
2000tNON-SMOKERRaT99
293
1981tHar81
188
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:
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
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
487.5 ± 48.2
-
331.1 ± 26.0
261.3 ± 16.0
219.9 ± 10.9
191.4 ± 8.1
170.2 ± 6.8
140.0 ± 6.1
119.3 ± 5.2
104.2 ± 4.4
83.7 ± 3.3
70.8 ± 3.0
Xfactor1.001.001.000.960.870.760.650.480.370.300.210.15
SEF1.001.001.001.011.041.081.121.211.291.361.501.63
Rate
2.89
-
2.78
2.72
2.72
2.74
2.78
2.84
2.88
2.92
2.99
3.06

MACS:
Reference: BSA01,endfb71,jendl40
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: 2013

X-factor:
Reference: Rau12
Year: 2012

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

Rate:
Reaction rate NA<σv> given in 107 cm3/mole/s, including SEF
Chart of nuclei
up
left
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
169Tm
100
1129 mb
170Tm
128.59 d
1870 mb, β-
171Tm
1.92 a
486 mb, β-
172Tm
2.65 d
β-
173Tm
8.24 h
β-
168Er
26.978
338 mb
169Er
9.39 d
653 mb, β-
170Er
14.91
170 mb
171Er
7.52 h
β-
172Er
2.05 d
β-
167Ho
3.00 h
β-
168Ho
2.99 m
β-
169Ho
4.72 m
β-
170Ho
2.76 m
β-
171Ho
53.00 s
β-
166Dy
3.40 d
β-
167Dy
6.20 m
β-
168Dy
8.70 m
β-
169Dy
39.00 s
β-
170Dy
30.00 s
β-
right
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Style: (S, M, L, XL or Alberto)


Isotope: Erbium