Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Gold (Z=79)
  197Au   198Au
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
197Au 198Au




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.0611.6 ± 6.0--
0.0582 ± 9--

(Version 0.0 corresponds to Bao et al.)
Comment
RR: will provide new text here.

Au-197 is used as standard for most astrophysical cross section measurements. Unfortunately, it is at the moment only a standard in the thermal region and between E(n)= 200 keV and 2.8 MeV (au197). Recent measurements at nTOF (CL11, CM10) and GELINA (MBD14) show a discrepancy of about 5% to the previously used standard value at kT= 30 keV from RaK88 and Mac82e.
The new recommended standard cross section for the astrophysical energy region was derived between kT= 5 and 50 keV by the weighted average of the GELINA measurement of MBD14 and the nTOF measurement of CL11,CM10. The uncertainty in this energy range was taken from MBD14. For the energies between kT= 60-100 keV we used the average of the recent libraries (jeff32, jendl40, endfb71) and the uncertainty from the standard deviation given in jeff32 and endfb71.
The previous standard value used for activations with the Li-7(p,n)Be-7 reaction at E(p)= 1912 keV was 586 (9) mb, the so-called "Ratynski value" (RaK88). At this energy the neutrons are collimated in a forward cone of 120 degree opening angle and resemble a quasi-stellar neutron spectrum of kT= 25 keV. With the new results this value would change to 632 (9) mb.
Last review: In process
List of all available values
originalrenorm.yeartypeCommentRef
613 ± 7
2014ceLINAC, U(gamma,f)/(gamma,n), TOF; Au:Sat.; incl. data from jeff32 MBD14
611 ± 22
2011cPb Spall., TOF; Au:Sat. CL11,CM10
617.8 ± 11.0
E(n)= 23 keV
5411991cSb-Be, Act., 1/v(E), 4pi manganese bath meth.SQK91
582 ± 9
1988cVdG, Act., 1/v(kT), Activity of 7Be from 7Li(p,n)RaK88
611 ± 18
1985rVdG, TOF., 6Li; Au:Sat.KKP85
592 ± 18
1984cVdG, Act., Activity of 7Be from 7Li(p,n)ZJC84
599 ± 33
1983bLinac, TOF, 10B, endfb52YIS83
588 ± 20
1982cLinac, TOF, 6Li, Au:Sat.Mac82e
628 ± 30
1977bVdG, TOF, 10B:Mag75KYM77
600 ± 40
1976cLinac, TOF, 10B:SPU71, 235U: endfb3GSI76
640 ± 40
1976cLinac, TOF, 10B:SPU71, 235U: endfb3GSI76
579 ± 8
1982cLinac, TOF, 6Li, Au:Sat.Mac82e
585 ± 17
1973cLinac, TOF, 10B:SPU71, 235U:Dav68CzS73
788 ± 79
23keV
5911973cSb-Be, Act., 1 /v(E), 127I: 836mb (23keV)SSR73
600 ± 50
1970cquoted from GSI76FLF70
596 ± 18
1969cVdG, TOF, 10B+6Li: endfb4Kom69
600 ± 9
1966cVdG, Act., Activity of 7Be from 7Li(p,n) + Mn bath methodPoe66a
600 ± 30
1963cLinac, TOF, 10B, quoted from GSI76MoR63
618.3 ± 7.9
2014eJEFF-3.2 plus standard dev.jeff32
614.1 ± 8.0
2011eENDF/B-VII.1 plus standard dev.endfb71
611.4
2011eJENDL-4.0jendl40
611.5
2004eJEFF-3.1jeff31
608.2
2001eENDF/B-VI.8endfb68
601.0
1994eENDF/B-V.2endfb52
626.2
1975eENDF/B-IVendfb4
691.0
1972eENDF/B-IIIendfb3
610 ± 20
1979eKin79
600 ± 50
1971eAGM71
399
2005tMOST 2005Gor05
420
2002tMOST 2002Gor02
528
2000tNON-SMOKERRaT99
1181
1981tHar81
842
1976tHWF76


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
bCalculated from smooth cross sections with model fit: ln(sigma) = a + a1 ln(E) + a2 ln^2(E)
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
2056 ± 37
1455 ± 19
1241 ± 14
940 ± 10
781 ± 8
681 ± 7
612 ± 6
521 ± 5
463 ± 5
423 ± 4
367 ± 4
329 ± 3
Xfactor1.001.001.001.001.000.990.980.970.940.920.840.74
SEF1.001.001.001.000.990.990.980.960.950.930.920.92
Rate
1.22
1.09
1.04
0.96
0.92
0.89
0.87
0.84
0.82
0.81
0.80
0.81

MACS:
Reference: Rei18
Procedure: 'd' (Renormalized 2017 based on updated Au measurement)
Year: 2018

X-factor:
Reference: Rau12
Year: 2012

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

Rate:
Reaction rate NA<σv> given in 108 cm3/mole/s, including SEF
Chart of nuclei
up
left
197Tl
2.84 h
β+
198Tl
5.30 h
β+
199Tl
7.42 h
β+
200Tl
1.09 d
β+
201Tl
3.04 d
β+
196Hg
0.15
204 mb
197Hg
2.67 d
β+
198Hg
9.97
173 mb
199Hg
16.87
374 mb
200Hg
23.1
115 mb
195Au
186.11 d
β+
196Au
6.17 d
β+
197Au
100
582 mb
198Au
2.70 d
840 mb, β-
199Au
3.14 d
β-
194Pt
32.967
365 mb
195Pt
33.832
860 mb
196Pt
25.242
183 mb
197Pt
19.89 h
β-
198Pt
7.163
92.2 mb
193Ir
62.7
994 mb
194Ir
19.28 h
β-
195Ir
2.50 h
β-
196Ir
52.00 s
β-
197Ir
5.80 m
β-
right
down
Style: (S, M, L, XL or Alberto)


Isotope: Gold