Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Potassium (Z=19)
  39K   40K   41K
Go to isotope
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]
0.011.8 ± 0.4--

(Version 0.0 corresponds to Bao et al.)
Comment
Last review: 1999
List of all available values
originalrenorm.yeartypeCommentRef
11.8 ± 0.4
1984cLinac, TOF, 6Li, Au:Sat.Mac84c
16 ± 2
1971eAGM71
18.51
2006eendfb7
18.51
2004ejeff31
18.51
2002ejendl33
16
2000tRaT99
12
1978tWFH78
33.8
2002tMOST 2002Gor02
30.7
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:
cDirectly quoted from the reference itself
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
24.2
20.2
17.1
14.8
13.1
11.8 ± 0.4
9.8
8.5
7.5
6.1
5.1
SEF1.001.001.001.001.001.001.001.001.001.001.00
Rate
1.45
1.71
1.77
1.77
1.75
1.73
1.66
1.61
1.56
1.46
1.37

MACS:
Reference: Mac84c
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: 1984

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
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
down
Style: (Size: S, M, L, XL, Alberto; No-Macs: nox)


Isotope: Potassium