Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Potassium (Z=19)
  39K   40K   41K
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
39K 40K




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.010.4 ± 1.0--
0.011.8 ± 0.4--

(Version 0.0 corresponds to Bao et al.)
Comment
Rec. value is average from recent evaluations (endfb71, tendl15) assuming 10% uncertainty.
Last review: May 2016
List of all available values
originalrenorm.yeartypeCommentRef
11.8 ± 0.4
1984cLinac, TOF, 6Li, Au:Sat.Mac84c
10.29
2015eTENDL-2015 using the TALYS codetendl15
10.30
2014eJEFF-3.2 using an older TENDL versionjeff32
10.56
2011eENDF/B-VII.1endfb71
18.51
2011eJENDL-4.0jendl40
18.51
2007eENDF/B-VII.0endfb7
18.51
2004eJEFF-3.1jeff31
16 ± 2
1971eAGM71
30.7
2005tMOST 2005Gor05
33.8
2002tMOST 2002Gor02
13.8
2000tNON-SMOKERRaT99
12
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
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
20.9
-
17.4
14.7
12.8
11.5
10.4 ± 1.0
8.9
7.8
6.9
5.5
4.6
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
1.25
-
1.47
1.52
1.53
1.54
1.53
1.51
1.48
1.43
1.32
1.23

MACS:
Reference: endfb71,tendl15
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: 2016

X-factor:
Reference: Rau12
Year: 2012

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

Rate:
Reaction rate NA<σv> given in 106 cm3/mole/s, including SEF
Chart of nuclei
up
left
39Sc
0.00 ms
P
40Sc
182.00 ms
β+
41Sc
596.00 ms
β+
42Sc
681.00 ms
β+
43Sc
3.89 h
β+
38Ca
440.00 ms
β+
39Ca
860.00 ms
β+
40Ca
96.94
6.7 mb
41Ca
102.01 ka
30 mb, β+
42Ca
0.647
15.6 mb
37K
1.23 s
β+
38K
7.64 m
β+
39K
93.2581
11.8 mb
40K
1.25x109 y
31 mb, β-
41K
6.7302
22 mb
36Ar
0.3365
9 mb
37Ar
34.95 d
β+
38Ar
0.0632
3 mb
39Ar
269.01 a
8 mb, β-
40Ar
99.6003
2.6 mb
35Cl
75.77
10 mb
36Cl
301.01 ka
12 mb, β-
37Cl
24.23
2.15 mb
38Cl
37.24 m
β-
39Cl
55.60 m
β-
right
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Style: (S, M, L, XL or Alberto)


Isotope: Potassium