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)
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
Rec. value is from GKD03. MACS vs. kT table from GKD03, but extended above kT= 50 keV with norm. energy dependence from KAB76,BAM75b.
Last review: February, 2013
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 ± 0.80
2011eENDF/B-VII.1 plus covariancesendfb71
3.61
2011eJENDL-4.0jendl40
3.61
2004eJEFF 3.1jeff31
1.69
2002eJENDL-3.3jendl33
5.81
2015tTENDL-2015 using the TALYS codetendl15
18.9
2005tMOST 2005Gor05
30.8
2002tMOST 2002Gor02
5.48
2000tNON-SMOKERRaT99
2.4
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
0.41 ± 0.09
0.44 ± 0.09
0.53 ± 0.09
0.86 ± 0.10
1.15 ± 0.11
1.33 ± 0.12
1.42 ± 0.13
1.47 ± 0.14
1.45 ± 0.15
1.34 ± 0.13
1.18 ± 0.12
1.02 ± 0.10
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
2.47
3.35
4.51
8.96
13.84
17.90
20.93
25.02
27.59
27.93
28.40
27.48

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

X-factor:
Reference: Rau12
Year: 2012

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

Rate:
Reaction rate NA<σv> given in 104 cm3/mole/s, including SEF
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