Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Argon (Z=18)
  36Ar   38Ar   39Ar   40Ar
Go to isotope
Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
40Ar 41Ar




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.22.54 ± 0.10--
0.02.6 ± 0.2--

(Version 0.0 corresponds to Bao et al.)
Comment
MACS vs. kT: Energy dependence taken from BSR02a.
Last review: July 18th, 2005
List of all available values
originalrenorm.yeartypeCommentRef
2.52 ± 0.28
2002cVdG, Act., Au:RaK88BSR02a
2.79 ± 0.15
1989cLinac, TOF, 6Li, Au:Sat.MWS89
2.33 ± 0.15
2.31985cVdG, Act., 1/v(kT), Au:657mb(25keV)BeP85
0.05
1983eGrK83
4.5
1971eAGM71
2.25
2006eendfb7
2.25
2004ejeff31
2.25
2002ejendl33
3.8
2000tRaT99
3.6
1978tWFH78
13.3
2002tMOST 2002Gor02
12.1
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
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
 3.34 
 3.21 
 3.00 
 2.69 
 2.62 
 2.59 
2.55 ± 0.15
 2.41 
 2.26 
 2.10 
 1.85 
1.65 
SEF1.001.01.001.001.001.001.001.001.001.001.001.00
Rate
2.00
2.43
2.54
2.79
3.14
3.47
3.74
4.08
4.28
4.36
4.43
4.42

MACS:
Reference: BSR02a
Procedure: 'e+t' (The MACS from kT=5 keV to 100 keV are derived from calculated cross sections, which are then normalized to experimental data, e.g. to the values at kT=25 keV obtained in activation measurements. In these cases the uncertainties should be linearly increased below 25 and above 30 keV to reach about 30% at the extreme kT values.)
Year: 2002

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
40Ca
96.94
6.7 mb
41Ca
102.01 ka
30 mb, β+
42Ca
0.647
15.6 mb
43Ca
0.135
51 mb
44Ca
2.09
9.4 mb
39K
93.2581
11.8 mb
40K
1.25x109 y
31 mb, β-
41K
6.7302
22 mb
42K
12.32 h
β-
43K
22.30 h
β-
38Ar
0.0632
3 mb
39Ar
269.01 a
8 mb, β-
40Ar
99.6003
2.6 mb
41Ar
1.83 h
β-
42Ar
32.90 a
β-
37Cl
24.23
2.15 mb
38Cl
37.24 m
β-
39Cl
55.60 m
β-
40Cl
1.35 m
β-
41Cl
38.40 s
β-
36S
0.02
0.171 mb
37S
5.05 m
β-
38S
2.84 h
β-
39S
11.50 s
β-
40S
8.80 s
β-
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Isotope: Argon
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