Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Silicon (Z=14)
  28Si   29Si   30Si   31Si   32Si
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
30Si 31Si




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.21.82 ± 0.33--
0.06.5 ± 0.6--

(Version 0.0 corresponds to Bao et al.)
Comment
Rec. value is from GKD03. MACS vs. kT table from GKD03, but extended above kT= 50 keV with norm. energy dependence from endfb71. Note that there is discrepancy between the activation measurement from BSR02b and the TOF value from GKD03. A further investigation is required!!!
Last review: August 2014
List of all available values
originalrenorm.yeartypeCommentRef
1.82 ± 0.33
2003cLinac, TOF, Au: Sat.; DC component is 0.48 (30) mb; no res. at 2.235 keV foundGKD03
3.51 ± 0.15
kT= 25 keV
3.24 ± 0.142002,2015cVdG, Act., Au:RaK88 corrected by 632 mb/586 mb= 1.0785; DC component at kT= 30 keV is 0.36 mbBSR02b
0.72 ± 0.07
kT= 52 keV
2002cVdG, Act., Au:RaK88BSR02b
6.5 ± 0.6
1975rLinac, TOF, 6Li, Au:Sat. Recalcul. including data of MDH81BAM75b
1.81
2015eTENDL-2015 using the TALYS codetendl15
4.43 ± 1.52
2011eENDF/B-VII.1 plus covariancesendfb71
4.43
2011eJENDL-4.0jendl40
5.75
2004eJEFF-3.1jeff31
5.75
2002eJENDL-3.3jendl33
1.9
1971eAGM71
7.64
2005tMOST 2005Gor05
7.99
2002tMOST 2002Gor02
2.02
2000tNON-SMOKERRaT99
1.5
1978tWFH78


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
rRecalculated for kT = 30keV with the code described in Ref. 2 after renormalizing the original data to updated standard cross sections
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
15.00 ± 1.48
9.15 ± 0.90
6.94 ± 0.69
4.05 ± 0.43
2.77 ± 0.34
2.13 ± 0.32
1.82 ± 0.33
1.61 ± 0.35
1.63 ± 0.39
1.32 ± 0.50
0.99 ± 0.40
0.82 ± 0.34
Xfactor1.001.001.001.001.001.001.001.001.001.001.001.00
SEF1.001.001.001.001.001.001.001.001.001.001.001.00
Rate
9.02
6.96
5.90
4.22
3.33
2.86
2.68
2.74
3.10
2.75
2.38
2.20

MACS:
Reference: GDK03, endfb71
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: 2003

X-factor:
Reference: Rau12
Year: 2012

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

Rate:
Reaction rate NA<σv> given in 105 cm3/mole/s, including SEF
Chart of nuclei
up
left
30S
1.18 s
β+
31S
2.57 s
β+
32S
95.02
4.1 mb
33S
0.75
7.4 mb
34S
4.21
0.226 mb
29P
4.14 s
β+
30P
2.50 m
β+
31P
100
1.74 mb
32P
14.26 d
β-
33P
25.34 d
β-
28Si
92.23
2.9 mb
29Si
4.683
7.9 mb
30Si
3.087
6.5 mb
31Si
2.62 h
β-
32Si
132.02 a
β-
27Al
100
3.74 mb
28Al
2.24 m
β-
29Al
6.56 m
β-
30Al
3.60 s
β-
31Al
644.00 ms
β-
26Mg
11.01
0.126 mb
27Mg
9.46 m
β-
28Mg
20.91 h
β-
29Mg
1.30 s
β-
30Mg
335.00 ms
β-
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Isotope: Silicon