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)
40Ar 41Ar




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.02.78 ± 0.30--
0.22.54 ± 0.10--
0.02.6 ± 0.2--

(Version 0.0 corresponds to Bao et al.)
Comment
New rec. value is weighted average of BSR02a (normalized by 632/586= 1.0785) and MWS89. MACS vs. kT calculated with energy dependence and uncertainties from BSR02a. Note that there is a strong discrepancy between the energy dependence of the evaluations (based on the measurement of MWS89) and the values given in BSR02a. Investigation needed!
Last review: May 2016
List of all available values
originalrenorm.yeartypeCommentRef
2.52 ± 0.28
2.72 ± 0.302002,2015cVdG, Act., Au:RaK88 corrected by 632/586= 1.0785BSR02a
2.35 ± 0.24
kT= 52 keV
2.48 ± 0.252002, 2016cVdG, Act., Au:KNA87 corrected by 455/431= 1.057BSR02a
2.79 ± 0.15
1989cLinac, TOF, 6Li, Au:Sat.MWS89
2.33 ± 0.15
2.42 ± 0.161985,2015cVdG, Act., 1/v(kT), Au: 657 mb (25keV) norm. by 683/657= 1.04 BeP85
2.37
2015tTENDL-2015 using the TALYS codetendl15
2.25
2014eJEFF-3.2jeff32
2.25
2011eENDF/B-VII.1endfb71
2.25
2011eJENDL-4.0jendl40
2.25
2004eJEFF-3.1jeff31
0.05
1983eGrK83
4.5
1971eAGM71
12.1
2005tMOST 2005Gor05
13.3
2002tMOST 2002Gor02
3.7
2000tNON-SMOKERRaT99
3.6
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
tTheoretical value
eEvaluated value taken directly from the reference
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
3.64 ± 0.15
3.50 ± 0.16
3.27 ± 0.16
2.93 ± 0.19
2.86 ± 0.24
2.82 ± 0.29
2.78 ± 0.30
2.60 ± 0.33
2.41 ± 0.31
2.25 ± 0.29
1.98 ± 0.25
1.76 ± 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
2.18
2.65
2.77
3.04
3.42
3.78
4.08
4.40
4.56
4.67
4.74
4.71

MACS:
Reference: BSR02a,MWS89
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: 2002,2016

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
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-
right
down
Style: (S, M, L, XL or Alberto)


Isotope: Argon