Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Oxygen (Z=8)
  16O   17O   18O
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
18O 19O




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.00.0139 ± 0.0019--
0.00.00886 ± 0.00080--

(Version 0.0 corresponds to Bao et al.)
Comment
Fit to all existing high-energy data (OIN08, MSG96, Vau68) including optimized resonance parameters and normalized p-wave DRC. p-wave DRC parameterized as sigma(p)= 44.86*sqrt(E) - 9.7*E^1.2 (E in keV and sigma in micro-barn). Average uncertainty from OIN08, MSG96 is 14 % which was taken also for the recommended value.
Last review: Jan. 4th, 2013
List of all available values
originalrenorm.yeartypeCommentRef
0.0085-0.0119
E(n,av.)= 42-64 keV
2008cPelletron, TOF, Au:ENDF/B-VI and MaG67bOIN08
0.00793 ± 0.00070
kT= 25 keV
1996cVdG, Act., 86Kr(n,gamma): Bee91,BRV91MSG96
0.0138-0.096
E(n,av.)= 129-370 keV
1996cVdG, Act., Au:RaK88MSG96
0.0153
1996tDRC calculations plus resonancesMSG96
0.0145
0.01162012tnorm. p-wave DRC calc.: sigma(p)= 44.86*sqrt(E) - 9.7*E^1.2MSG96
0.0029
2003tJEFF3.0/A; missing res. at 152 keVjeff30A
2.74
2002tMOST 2002Gor02
2.35
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
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
0.0057
-
0.0078
0.0094
0.0109
0.0124
0.0139 ± 0.0012
0.017
0.0207
0.0252
0.0362
0.0481
SEF1.001.001.001.001.001.001.001.001.001.001.001.00
Rate
3.46
-
6.70
9.89
13.24
16.85
20.69
29.21
39.77
53.03
87.97
130.69

MACS:
Reference: MSG96,OIN08,Vau68
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: 2012

X-factor:
Please note: X-factors for this element have not been calculated but are expected to be close to 1.

SEF (Stellar enhancement factor):
Reference: Rau09
Year: 2009
Comment:
Please note: SEF for this element have not been calculated but are expected to be close to 1.

Rate:
Reaction rate NA<σv> given in 102 cm3/mole/s, including SEF
Chart of nuclei
up
left
18Ne
1.67 s
β+
19Ne
17.22 s
β+
20Ne
90.48
0.119 mb
21Ne
0.27
1.5 mb
22Ne
9.25
0.059 mb
17F
1.07 m
β+
18F
1.83 h
β+
19F
100
5.8 mb
20F
11.07 s
β-
21F
4.16 s
β-
16O
99.762
0.038 mb
17O
0.038
18O
0.2
0.00886 mb
19O
26.88 s
β-
20O
13.51 s
β-
15N
0.366
0.0058 mb
16N
7.13 s
β-
17N
4.17 s
β-
18N
624.00 ms
β-
19N
271.00 ms
β-
14C
5.70 ka
0.00848 mb, β-
15C
2.45 s
β-
16C
747.00 ms
β-
17C
193.00 ms
β-
18C
92.00 ms
β-
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Isotope: Oxygen