Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Zinc (Z=30)
  64Zn   65Zn   66Zn   67Zn   68Zn   69Zn   70Zn
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
68Zn 69Zn




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.020.9 ± 2.7-3.25 ± 0.09
0.019.2 ± 2.4-3.4 ± 1.0

(Version 0.0 corresponds to Bao et al.)
Comment
New rec. value is from recent evaluations (endfb71/jendl40,tendl15) using uncertainty of 12.5% from GTH82 plus deviation between evaluations.
New rec. partial cross section was calculated with branching ratio to isomeric state of 0.0728 from endfb71. However, a normalization factor of f=2.14 (including the renormalization factor for the new 197Au cross section) was required to reproduce new data of RDH12, which hints either to an underestimation of the branching ratio by this factor or the corresponding total cross section. More investigation needed. (Note: Perfect agreement of RDH12 with an unpublished measurement of ID13b).
Last review: June 2016
List of all available values
originalrenorm.yeartypeCommentRef
19.2 ± 2.4
1982cLinac, TOF, 6Li, Au:Sat.GTH82
21.0
2015eTENDL-2015 using the TALYS codetendl15
20.7
2011eENDF/B-VII.1endfb71
20.7
2011eJENDL-4.0jendl40
23 ± 3
1971eAGM71
20.9
2005tMOST 2005Gor05
24.4
2002tMOST 2002Gor02
28.5
2000tNON-SMOKERRaT99
9.3
1981tHar81
11
1978tWFH78
Partial cross section to 69mZn:
4.0 ± 1.0
3.41973cSb-Be, Act., 1/v(E), 127I:832mb(24keV)MSR73
3.30 ± 0.09
25 keV
3.25 ± 0.092012,2014rVdG, Act., Au:RaK88 corrected by 632/586= 1.0785; en. dep. from endfb71RDH12
3.26 ± 0.65
25 keV
3.20 ± 0.642013,2014uVdG, Act., Au:RaK88 corrected by 632/586= 1.0785; energy dep. from endfb71; unpublishedID13b
1.51
2011eENDF/B-VII.1; branching ratio at 30 keV= 0.0728endfb71


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
rRecalculated for kT = 30keV with the code described in Ref. 2 after renormalizing the original data to updated standard cross sections
uUnpublished value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
66.8 ± 12.8
-
40.7 ± 7.4
31.2 ± 5.2
26.2 ± 4.0
23.0 ± 3.3
20.9 ± 2.7
18.1 ± 2.6
16.4 ± 2.7
15.1 ± 2.8
13.6 ± 3.0
12.6 ± 3.0
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
3.98
-
3.43
3.22
3.12
3.06
3.05
3.05
3.09
3.12
3.24
3.36

MACS:
Reference: endfb71, jendl40,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
68Ge
270.95 d
β+
69Ge
1.63 d
β+
70Ge
20.37
88 mb
71Ge
11.43 d
β+
72Ge
27.31
73 mb
67Ga
3.26 d
β+
68Ga
1.13 h
β+
69Ga
60.108
139 mb
70Ga
21.14 m
β-
71Ga
39.892
123 mb
66Zn
27.9
35 mb
67Zn
4.1
153 mb
68Zn
18.75
19.2 mb
69Zn
56.40 m
β-
70Zn
0.62
21.5 mb
65Cu
30.83
41 mb
66Cu
5.12 m
β-
67Cu
2.58 d
β-
68Cu
31.10 s
β-
69Cu
2.85 m
β-
64Ni
0.926
8.7 mb
65Ni
2.52 h
β-
66Ni
2.27 d
β-
67Ni
21.00 s
β-
68Ni
29.00 s
β-
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Isotope: Zinc