Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Argon (Z=18)
  36Ar   37Ar   38Ar   39Ar   40Ar   41Ar   42Ar
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]
1.01.6 ± 0.4*--
0.08 ± 2*--

(Version 0.0 corresponds to Bao et al.)
Comment
No experimental data. New rec. value is from JEFF-3.2 which uses an older prediction from the TALYS code. Assuming 25% uncertainty. The TENDL-2015 predictions seems to overestimate the cross section by 2 orders of magnitude (similar behaviour seen with 41Ar). However, this recommended value is lower than its even-N neighbors, which is unusual. More investigation needed.
Last review: April 2016
List of all available values
originalrenorm.yeartypeCommentRef
278.3
2015tTENDL-2015 using the TALYS codetendl15
1.57
2014tJEFF-3.2 using an older TALYS codejeff32
48.9
2005tMOST 2005Gor05
53.7
2002tMOST 2002Gor02
8.9
2000tNON-SMOKERRaT99
8
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:
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
6.2
-
3.2
2.2
1.8
1.7
1.6 ± 0.4
1.5
1.4
1.3
1.2
1.1
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
3.71
-
2.71
2.28
2.16
2.28
2.35
2.54
2.65
2.70
2.87
2.95

MACS:
Reference: jeff32
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 105 cm3/mole/s, including SEF
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
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Style: (S, M, L, XL or Alberto)


Isotope: Argon