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)
31Si 32Si




Cross sections do not include stellar enhancement factors!
* only theoretical data available
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.00.36 ± 0.09*--

(Version 0.0 corresponds to Bao et al.)
Comment
New dataset. No experimental data available. New rec. value is theoretical prediction from TENDL-2015 assuming 25% uncertainty.
Last review: April 2016
List of all available values
originalrenorm.yeartypeCommentRef
0.36
2015tTENDL-2015 using the TALYS codetendl15
0.57
2014eJEFF-3.2jeff32
25.0
2005eJEFF-3.0Ajeff30A
2.47
2000tNON-SMOKERRaT99


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:
tTheoretical value
eEvaluated value taken directly from the reference
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
0.15
-
0.30
0.37
0.38
0.37
0.36 ± 0.09
0.33
0.31
0.29
0.25
0.22
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
9.01
-
25.49
38.50
45.66
49.71
52.98
56.08
58.90
60.35
60.08
59.11

MACS:
Reference: tendl15
Procedure: 't' (The MACS from kT=5 keV to 100 keV are obtained from theoretical calculations with corresponding uncertainties between 25 and 50% in most cases.)
Year: 2016

X-factor:
Reference: Rau12
Year: 2012

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

Rate:
Reaction rate NA<σv> given in 103 cm3/mole/s, including SEF
Chart of nuclei
up
left
31S
2.57 s
β+
32S
95.02
4.1 mb
33S
0.75
7.4 mb
34S
4.21
0.226 mb
35S
87.51 d
β-
30P
2.50 m
β+
31P
100
1.74 mb
32P
14.26 d
β-
33P
25.34 d
β-
34P
12.43 s
β-
29Si
4.683
7.9 mb
30Si
3.087
6.5 mb
31Si
2.62 h
β-
32Si
132.02 a
β-
33Si
6.18 s
β-
28Al
2.24 m
β-
29Al
6.56 m
β-
30Al
3.60 s
β-
31Al
644.00 ms
β-
32Al
33.00 ms
β-
27Mg
9.46 m
β-
28Mg
20.91 h
β-
29Mg
1.30 s
β-
30Mg
335.00 ms
β-
31Mg
230.00 ms
β-
right
down
Style: (S, M, L, XL or Alberto)


Isotope: Silicon