Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Selenium (Z=34)
  74Se   76Se   77Se   78Se   79Se   80Se   82Se
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
74Se 75Se




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
0.2271 ± 15--
0.0267 ± 25*--

(Version 0.0 corresponds to Bao et al.)
Comment
Previous MACS vs. kT table multiplied by 1.015.
Last review: January 30th, 2006
List of all available values
originalrenorm.yeartypeCommentRef
271 ± 15
2006cVdG, Act., Au:RaK88DHK06a
160
1971sAGM71
209.0
2006eendfb7
156.0
2004ejeff31
209.0
2002ejendl33
201
2000tRaT99
96 ± 31
1988tZZC88
193
1981tHar81
360
1978tWFH78
301
2002tMOST 2002Gor02
245
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
sSemiempirical estimates given in the reference
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
 687 
 473 
 384 
 332 
 296 
271 ± 15
 235 
 212 
 195 
 173 
 159 
SEF1.001.001.001.001.001.001.001.001.001.001.00
Rate
4.09
3.98
3.96
3.95
3.94
3.95
3.96
3.99
4.02
4.12
4.25

MACS:
Reference: DHK06a,RaT99
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: 2000,2006

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

Rate:
Reaction rate NA<σv> given in 107 cm3/mole/s, including SEF
Isotopic mass chain
Isotopic Mass Chain
Chart of nuclei
up
left
74Kr
11.50 m
β+
75Kr
4.29 m
β+
76Kr
14.80 h
β+
77Kr
1.24 h
β+
78Kr
0.35
321 mb
73Br
3.40 m
β+
74Br
25.40 m
β+
75Br
1.61 h
β+
76Br
16.20 h
β+
77Br
2.38 d
β+
72Se
8.40 d
β+
73Se
7.15 h
β+
74Se
0.89
267 mb
75Se
119.78 d
β+
76Se
9.37
164 mb
71As
2.72 d
β+
72As
1.08 d
β+
73As
80.30 d
β+
74As
17.77 d
β+
75As
100
362 mb
70Ge
20.37
88 mb
71Ge
11.43 d
β+
72Ge
27.31
73 mb
73Ge
7.76
243 mb
74Ge
36.73
37.6 mb
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Isotope: Selenium
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