| s-process | p-process |
Available isotopes for Chromium (Z=24)
Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
50Cr 
51Cr
51Cr
| Total MACS at 30keV: | 36.2 | ± | 2.4 | mb |
Cross sections do not include stellar enhancement factors!
History
| Version | Total MACS [mb] | Partial to gs [mb] | Partial to isomer [mb] |
|---|---|---|---|
| 1.0 | 36.2 ± 2.4 | - | - |
| 0.0 | 49 ± 13 | - | - |
(Version 0.0 corresponds to Bao et al.)
Comment
Rec. value is unpublished work from ID13b using energy dependences from endfb71, jeff31, jendl40. Value in v1.0 renormalized by f= 1.0785 (632 mb/586 mb) due to corrected Gold cross section from RaK88 for activations. Evaluation in endfb71 done with unpublished data from Oakridge Nat. Lab. (Harvey, priv. comm. 2007).
Last review: December 2014
Last review: December 2014
List of all available values
| original | renorm. | year | type | Comment | Ref |
33.6 ± 1.7 | 36.2 ± 2.4 | 2013,2014 | u | VdG, Act., Au:RaK88 corrected by 632/586= 1.0785; en. dep. from endfb71, jeff31, jendl40; unpublished | ID13b |
48.5 ± 13.0 | 1977 | r | Linac, TOF, 6Li, Au+Ti:Sat., k=1.0737; Recalcul. including data of MDH81 | KAM77b | |
52 ± 13 | 1977 | c,2 | Linac, TOF, 6Li, Au+Ti:Sat., k=1.0737 | KAM77b | |
50 ± 15 | 51 ± 15 | 1975 | c | VdG, TOF, Au:596mb Kom69; renorm. by 613/596= 1.029 | BSE74,BeS75 |
38.3 | 2015 | e | TENDL-2015 using the TALYS code | tendl15 | |
38.3 ± 0.2 | 2011 | e | ENDF/B-VII.1 incl. covariances | endfb71 | |
37.0 | 2011 | e | JENDL-4.0 | jendl40 | |
37.8 | 2006 | e | ENDF/B-VII.0 | endfb7 | |
37.8 | 2004 | e | JEFF-3.1 | jeff31 | |
31 ± 4 | 1971 | e | AGM71 | ||
63.0 | 2005 | t | MOST 2005 | Gor05 | |
108 | 2002 | t | MOST 2002 | Gor02 | |
44.8 | 2000 | t | NON-SMOKER | RaT99 | |
34 | 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:
| u | Unpublished value |
| r | Recalculated for kT = 30keV with the code described in Ref. 2 after renormalizing the original data to updated standard cross sections |
| c | Directly quoted from the reference itself |
| 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 | 183.1 ± 7.2 | - | 95.7 ± 3.8 | 65.2 ± 2.5 | 50.6 ± 1.8 | 42.0 ± 1.7 | 36.2 ± 2.4 | 29.2 ± 2.0 | 25.0 ± 2.4 | 22.1 ± 2.6 | 18.2 ± 3.0 | 15.6 ± 3.1 |
| 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 | 1.09 | - | 0.81 | 0.67 | 0.60 | 0.56 | 0.53 | 0.49 | 0.47 | 0.46 | 0.43 | 0.42 |
MACS:
Reference: ID13, endfb71, jeff31, jendl40
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: 2013,2014
X-factor:
Reference:
Year:
SEF (Stellar enhancement factor):
Reference:
Year:
Comment:
Rate:
Reaction rate NA<σv> given in 107 cm3/mole/s, including SEF
Chart of nuclei
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Isotope: Chromium