Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Krypton (Z=36)
  78Kr   79Kr   80Kr   81Kr   82Kr   83Kr   84Kr   85Kr   86Kr
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
80Kr 81Kr




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.0276 ± 15-95.1 ± 3.8
0.0267 ± 14-88.2 ± 3.5

(Version 0.0 corresponds to Bao et al.)
Comment
New rec. value is weighted average of MBB05 and WLK86 (normalized by 613 mb/ 601 mb= 1.02). Uncertainty in MBB05 is only statistical, assumed 5% total uncertainty.
New MACS vs. kT table is normalized average from recently evaluated databases (jendl40, endfb71, jeff32, tendl15). There is an additional uncertainty introduced in the MACS vs. kT table from the deviation of the evaluations, which can be as high as 11% for kT= 5 keV.
Isomeric ratio at kT= 30 keV is IR= 0.345.
Last review: December 2016
List of all available values
originalrenorm.yeartypeCommentRef
290 ± 2
290 ± 152004cLinac, TOF, 131XeMBB05
257 ± 15
262 ± 151986rVdG, TOF, Au:B-V norm. by 613 mb/601 mb= 1.02WLK86
250.8
2015eTENDL-2015 using the TALYS codetendl15
264.9
2014eJEFF-3.2 using calculations from TENDL-2012jeff32
295.2
2011eENDF/B-VII.1endfb71
282.3
2011eJENDL-4.0jendl33
212.0
2004eJEFF-3.1jeff31
295.2
2002eJENDL-3.3jendl33
310
1988eKWN88
140
1971sAGM71
223
2005tMOST 2005Gor05
206
2002tMOST 2002Gor02
203
2000tNON-SMOKERRaT99
242
1986tWLK86
156
1981tHar81
150
1978tWFH78
Partial cross section to 81mKr:
65.5 ± 6.7
kT= 52 keV
2002cVdG, Fast Cycling Act., Au:RaK88; partial xs to isomerBSR02a
45.9 - 46.7
E(n)= 149 - 215 keV
2002cVdG, Fast Cycling Act., Au:RaK88; partial xs to isomerBSR02a
88.2 ± 3.5
95.1 ± 3.81991,2015cVdG, Act., 1/v(kT),Au:RaK88 corrected by 632/586= 1.0785Bee91


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
rRecalculated for kT = 30keV with the code described in Ref. 2 after renormalizing the original data to updated standard cross sections
eEvaluated value taken directly from the reference
sSemiempirical estimates given in the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
701 ± 76
-
488 ± 48
396 ± 34
341 ± 26
303 ± 20
276 ± 15
239 ± 12
214 ± 11
197 ± 10
175 ± 9
162 ± 7
Xfactor1.001.001.001.001.001.001.001.001.001.001.000.99
SEF1.001.001.001.001.001.001.001.001.001.001.001.00
Rate
4.17
-
4.11
4.08
4.06
4.03
4.02
4.02
4.03
4.06
4.17
4.33

MACS:
Reference: MBB05,WLK86,jendl40, endfb71, jeff32, 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 107 cm3/mole/s, including SEF
Chart of nuclei
up
left
80Sr
1.77 h
β+
81Sr
22.30 m
β+
82Sr
25.55 d
β+
83Sr
1.35 d
β+
84Sr
0.56
368 mb
79Rb
22.90 m
β+
80Rb
33.40 s
β+
81Rb
4.57 h
β+
82Rb
1.27 m
β+
83Rb
86.20 d
β+
78Kr
0.35
321 mb
79Kr
1.46 d
959 mb, β+
80Kr
2.28
267 mb
81Kr
229.02 ka
607 mb, β+
82Kr
11.58
90 mb
77Br
2.38 d
β+
78Br
6.46 m
β+
79Br
50.69
622 mb
80Br
17.68 m
β-
81Br
49.31
239 mb
76Se
9.37
164 mb
77Se
7.63
418 mb
78Se
23.77
109 mb
79Se
294.99 ka
263 mb, β-
80Se
49.61
42 mb
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Isotope: Krypton