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)
41K 42K




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

(Version 0.0 corresponds to Bao et al.)
Comment
Last review: 1999
List of all available values
originalrenorm.yeartypeCommentRef
22.0 ± 0.7
1984cLinac, TOF, 6Li, Au:Sat.Mac84c
22 ± 3
1971eAGM71
31.41
2006eendfb7
31.41
2004ejeff31
31.41
2002ejendl33
26
2000tRaT99
17
1978tWFH78
94.8
2002tMOST 2002Gor02
44.2
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
88.0
49.3
35.7
28.8
24.7
22.0 ± 0.7
18.7
16.7
15.3
13.5
12.1
SEF1.001.001.001.001.001.001.001.001.001.001.00
Rate
5.27
4.17
3.70
3.45
3.31
3.23
3.17
3.16
3.17
3.23
3.24

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


Isotope: Potassium