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




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.26.58 ± 0.66--
0.07.9 ± 0.9--

(Version 0.0 corresponds to Bao et al.)
Comment
Previous MACS vs. kT table multiplied by 0.833.
Last review: January 30th, 2006
List of all available values
originalrenorm.yeartypeCommentRef
6.58 ± 0.66
2003cLinac, TOF, Au: Sat.; DC component is 0.98 (69) mbGKD03
7.9 ± 0.8
1976rLinac, TOF, 6Li, Au:Sat. Recalcul. including data of MDH81KAB76,BAM75b
10.4
1971sAGM71
7.77
2006eendfb7
5.75
2004ejeff31
5.75
2002ejendl33
8.5
2000tRaT99
5.4
1978tWFH78
89.2
2002tMOST 2002Gor02
63.8
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
rRecalculated for kT = 30keV with the code described in Ref. 2 after renormalizing the original data to updated standard cross sections
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
 8.58 
 11.99 
 11.08 
 9.41 
 7.91 
 6.58 
 4.83 
 3.66 
 2.83 
 1.92 
 1.42 
SEF1.001.001.001.001.001.001.001.001.001.001.00
Rate
5.16
10.20
11.54
11.32
10.64
9.69
8.22
6.96
5.90
4.62
3.82

MACS:
Reference: KAB76,BAM75b,GDK03
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: 1976,2003

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

Rate:
Reaction rate NA<σv> given in 105 cm3/mole/s, including SEF
Isotopic mass chain
Isotopic Mass Chain
Chart of nuclei
up
left
29S
187.00 ms
β+
30S
1.18 s
β+
31S
2.57 s
β+
32S
95.02
4.1 mb
33S
0.75
7.4 mb
28P
270.00 ms
β+
29P
4.14 s
β+
30P
2.50 m
β+
31P
100
1.74 mb
32P
14.26 d
β-
27Si
4.16 s
β+
28Si
92.23
2.9 mb
29Si
4.683
7.9 mb
30Si
3.087
6.5 mb
31Si
2.62 h
β-
26Al
717.12 ka
3.7 mb, β+
27Al
100
3.74 mb
28Al
2.24 m
β-
29Al
6.56 m
β-
30Al
3.60 s
β-
25Mg
10
6.4 mb
26Mg
11.01
0.126 mb
27Mg
9.46 m
β-
28Mg
20.91 h
β-
29Mg
1.30 s
β-
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Isotope: Silicon
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