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)
28Si 29Si




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.21.42 ± 0.13--
0.02.9 ± 0.3--

(Version 0.0 corresponds to Bao et al.)
Comment
Previous MACS vs. kT table multiplied by 0.49.
Last review: January 30th, 2006
List of all available values
originalrenorm.yeartypeCommentRef
1.42 ± 0.13
2003cLinac, TOF, Au: Sat.; DC component is 0.23 (11) mbGKD03
2.9 ± 0.3
1976rLinac, TOF, 6Li, Au:Sat. Recalcul. including data of MDH81KAB76,BAM75b
3.8 ± 1.0
1971eAGM71
3.61
2006eendfb7
3.61
2004ejeff31
1.69
2002ejendl33
5.5
2000tRaT99
2.4
1978tWFH78
30.8
2002tMOST 2002Gor02
18.9
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
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
 0.14 
 0.42 
 0.93 
 1.22 
 1.37 
1.42 ± 0.13
 1.37 
 1.32 
 1.22 
 1.08 
0.93 
SEF1.001.001.001.001.001.001.001.001.001.001.00
Rate
8.43
35.74
96.94
146.84
184.35
209.32
233.19
251.20
254.33
259.97
250.54

MACS:
Reference: KAB76,BAM75b, GKD03
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 103 cm3/mole/s, including SEF
Isotopic mass chain
Isotopic Mass Chain
Chart of nuclei
up
left
28S
125.00 ms
β+
29S
187.00 ms
β+
30S
1.18 s
β+
31S
2.57 s
β+
32S
95.02
4.1 mb
27P
260.00 ms
β+
28P
270.00 ms
β+
29P
4.14 s
β+
30P
2.50 m
β+
31P
100
1.74 mb
26Si
2.23 s
β+
27Si
4.16 s
β+
28Si
92.23
2.9 mb
29Si
4.683
7.9 mb
30Si
3.087
6.5 mb
25Al
7.18 s
β+
26Al
717.12 ka
3.7 mb, β+
27Al
100
3.74 mb
28Al
2.24 m
β-
29Al
6.56 m
β-
24Mg
78.99
3.3 mb
25Mg
10
6.4 mb
26Mg
11.01
0.126 mb
27Mg
9.46 m
β-
28Mg
20.91 h
β-
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Isotope: Silicon
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