| s-process | p-process |
Available isotopes for Iron (Z=26)
Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
56Fe 
57Fe
57Fe
| Total MACS at 30keV: | 11.7 | ± | 1.2 | mb |
Cross sections do not include stellar enhancement factors!
History
| Version | Total MACS [mb] | Partial to gs [mb] | Partial to isomer [mb] |
|---|---|---|---|
| 1.0 | 11.7 ± 1.2 | - | - |
| 0.0 | 11.7 ± 0.5 | - | - |
(Version 0.0 corresponds to Bao et al.)
Comment
New rec. value is average from recent evaluated libraries (endfb71,jendl40,tendl15,jeff32) including covariance data. Rec. value did not change, but uncertainty and MACS vs. kT table. Given the importance as main seed nucleus a more accurate measurement is desired.
Last review: June 2016
Last review: June 2016
List of all available values
| original | renorm. | year | type | Comment | Ref |
12.22 ± 2.06 | 2009 | c | Pelletron, TOF, Au: endfb7 | WLK09 | |
11.7 ± 0.5 | 1992 | a | Linac, TOF, 6Li+10B+235U, Au:Sat. | CFM91,CFM92 | |
13.9 ± 0.7 | 10.9 | 1983 | r | VdG, TOF, Au:(B-IV)+(B-V) | KWH83,CBB83 |
14.4 ± 2.0 | 1977 | b | Linac, TOF, 6Li, Au:Sat. | AlM77,AMB76 | |
13.2 ± 2.0 | 1976 | b,2 | Linac, TOF, 6Li, Au:Sat., k=1.0000 | AMB76 | |
15.1 ± 1.3 | 1976 | c,2 | Linac, TOF, 6Li, Au:Sat., k=1.0000 | AMB76 | |
11.85 | 2015 | e | TENDL-2015 using the TALYS code | tendl15 | |
11.48 | 2014 | e | JEFF-3.2 | jeff32 | |
11.84 ± 1.17 | 2011 | e | JENDL-4.0 incl. covariance data | jendl40 | |
11.50 ± 1.18 | 2011 | e | ENDF/B-VII.1 incl. covariance data | endfb71 | |
11.48 | 2004 | e | JEFF-3.1 | jeff31 | |
13.5 ± 2.0 | 1971 | e | AGM71 | ||
36.0 | 2005 | t | MOST 2005 | Gor05 | |
37.2 | 2002 | t | MOST 2002 | Gor02 | |
26.2 | 2000 | t | NON-SMOKER | RaT99 | |
15 | 1981 | t | Har81 | ||
19 | 1978 | t | WFH78 |
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:
| c | Directly quoted from the reference itself |
| a | Calculated from resonance parameters with the formula from Ref. 45 |
| r | Recalculated for kT = 30keV with the code described in Ref. 2 after renormalizing the original data to updated standard cross sections |
| b | Calculated from smooth cross sections with model fit: ln(sigma) = a + a1 ln(E) + a2 ln^2(E) |
| 2 | Including k from Ref. ABM82, where k is a correction factor which has been applied to the originally reported cross section |
| e | Evaluated value taken directly from the reference |
| t | Theoretical value |
MACS, SEF and Reaction Rates for different energies
| Energy | 5keV | 8keV | 10keV | 15keV | 20keV | 25keV | 30keV | 40keV | 50keV | 60keV | 80keV | 100keV |
| MACS | 11.0 ± 1.1 | - | 9.2 ± 1.0 | 10.6 ± 1.1 | 11.3 ± 1.2 | 11.7 ± 1.2 | 11.7 ± 1.2 | 11.4 ± 1.1 | 10.8 ± 1.1 | 10.3 ± 1.0 | 9.4 ± 1.0 | 8.7 ± 1.0 |
| Xfactor | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| SEF | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| Rate | 6.56 | - | 7.76 | 10.95 | 13.48 | 15.61 | 17.10 | 19.24 | 20.37 | 21.29 | 22.43 | 23.21 |
MACS:
Reference: endfb71,jendl40,tendl15,jeff32
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:
Year:
SEF (Stellar enhancement factor):
Reference:
Year:
Comment:
Rate:
Reaction rate NA<σv> given in 105 cm3/mole/s, including SEF
Chart of nuclei
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Isotope: Iron