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)
41K 42K




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.020.1 ± 2.0--
0.022.0 ± 0.7--

(Version 0.0 corresponds to Bao et al.)
Comment
Rec. value is average from recent evaluations (endfb71, tendl15) assuming 10% uncertainty.
Last review: February 2013
List of all available values
originalrenorm.yeartypeCommentRef
22.0 ± 0.7
1984cLinac, TOF, 6Li, Au:Sat.Mac84c
19.9
2015eTENDL-2015 using the TALYS codetendl15
12.7
2014eJEFF-3.2 using an older TENDL version jeff32
20.3
2011eENDF/B-VII.1endfb71
31.41
2011eJENDL-4.0jendl40
31.41
2007eENDF/B-VII.0endfb7
31.41
2004eJEFF-3.1jeff31
22 ± 3
1971eAGM71
44.2
2005tMOST 2005Gor05
94.8
2002tMOST 2002Gor02
22.7
2000tNON-SMOKERRaT99
17
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
77.0
-
44.0
32.2
26.2
22.5
20.1 ± 2.0
16.9
14.7
13.0
10.7
9.1
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
4.61
-
3.72
3.34
3.14
3.01
2.95
2.86
2.78
2.70
2.56
2.44

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
41Sc
596.00 ms
β+
42Sc
681.00 ms
β+
43Sc
3.89 h
β+
44Sc
3.97 h
β+
45Sc
100
69 mb
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-
right
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Style: (S, M, L, XL or Alberto)


Isotope: Potassium