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)
39Ar 40Ar




Cross sections do not include stellar enhancement factors!
* only theoretical data available
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.08 ± 2*--

(Version 0.0 corresponds to Bao et al.)
Comment
Last review: 1999
List of all available values
originalrenorm.yeartypeCommentRef
9.3
2000tRaT99
8
1978tWFH78
53.7
2002tMOST 2002Gor02
48.9
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:
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
35
20
14
11
9.3
8.0 ± 2.0
6.4
5.3
4.6
3.8
3.2
SEF1.001.001.001.001.001.001.001.001.001.001.00
Rate
2.10
1.69
1.45
1.32
1.25
1.17
1.08
1.00
0.95
0.91
0.86

MACS:
Reference:
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: 2000

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

Rate:
Reaction rate NA<σv> given in 106 cm3/mole/s, including SEF
Isotopic mass chain
Isotopic Mass Chain
Chart of nuclei
up
left
39Ca
860.00 ms
β+
40Ca
96.94%
6.7 mb
41Ca
102.01 ka
30 mb, β+
42Ca
0.647%
15.6 mb
43Ca
0.135%
51 mb
38K
7.64 m
β+
39K
93.2581%
11.8 mb
40K
1.25x109 y
31 mb, β-
41K
6.7302%
22 mb
42K
12.32 h
β-
37Ar
34.95 d
β+
38Ar
0.0632%
3 mb
39Ar
269.01 a
8 mb, β-
40Ar
99.6003%
2.6 mb
41Ar
1.83 h
β-
36Cl
301.01 ka
12 mb, β-
37Cl
24.23%
2.15 mb
38Cl
37.24 m
β-
39Cl
55.60 m
β-
40Cl
1.35 m
β-
35S
87.51 d
β-
36S
0.02%
0.171 mb
37S
5.05 m
β-
38S
2.84 h
β-
39S
11.50 s
β-
right
down
Style: (Size: S, M, L, XL, Alberto; No-Macs: nox)


Isotope: Argon