| s-process | p-process |
Available isotopes for Selenium (Z=34)
Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
80Se 
81Se
81Se
| Total MACS at 30keV: | 39.8 | ± | 4.1 | mb |
| Partial c.s. to isomer: | 8.6 | ± | 0.9 | mb |
Cross sections do not include stellar enhancement factors!
History
| Version | Total MACS [mb] | Partial to gs [mb] | Partial to isomer [mb] |
|---|---|---|---|
| 1.0 | 39.8 ± 4.1 | - | 8.6 ± 0.9 |
| 0.0 | 42 ± 3 | - | - |
(Version 0.0 corresponds to Bao et al.)
Comment
New rec. value and MACS vs. kT table is average from recent evaluations (tendl15,endfb71,jendl40) which fits measurement of IKK11. Uncertainty is 4.7% from IKK11 plus deviation between the evaluations. No values shown for Se-80 in the paper, only available as private communication to EXFOR. There is reasonable agreement with the older data of WBK86b. Isomeric ratio at kT= 30 keV is IR= 0.217.
Last review: June 2016
Last review: June 2016
List of all available values
| original | renorm. | year | type | Comment | Ref |
34.8-11.5E(n)= 21-542 keV | 2010 | c | Pelletron, TOF, Au:ENDF/B-VI and MaG67b | IKK11 | |
44 ± 3 | 44.9 | 1986 | c | VdG, TOF, Au:B-V norm. by 613/602=1.02 | WBK86b |
42.3 | 2015 | e | TENDL-2015 using the TALYS code | tendl15 | |
39.5 | 2014 | e | JEFF-3.2 using calculations from TENDL-2012 | jeff32 | |
39.4 | 2011 | e | ENDF/B-VII.1 | endfb71 | |
38.0 | 2011 | e | JENDL-4.0 | jendl40 | |
67.2 | 2004 | e | JEFF-3.1 | jeff31 | |
39.4 | 2002 | e | JENDL-3.3 | jendl33 | |
50.7 | 2005 | t | MOST 2005 | Gor05 | |
55.9 | 2002 | t | MOST 2002 | Gor02 | |
38.2 | 2000 | t | NON-SMOKER | RaT99 | |
20 ± 12 | 1971 | e | AGM71 | ||
34 | 1981 | t | Har81 | ||
41 | 1978 | t | WFH78 | ||
| Partial cross section to 81mSe: | |||||
9.125 keV | 8.6 ± 0.9 | 2013 | u | VdG, Act., Au:RaK88 corrected by 632/586= 1.0785; energy dep. from jendl40; unpublished | ID13b |
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 |
| e | Evaluated value taken directly from the reference |
| t | Theoretical value |
| u | Unpublished value |
MACS, SEF and Reaction Rates for different energies
| Energy | 5keV | 8keV | 10keV | 15keV | 20keV | 25keV | 30keV | 40keV | 50keV | 60keV | 80keV | 100keV |
| MACS | 173.8 ± 23.1 | - | 93.6 ± 6.8 | 65.7 ± 4.3 | 52.4 ± 3.7 | 44.8 ± 3.8 | 39.8 ± 4.1 | 33.8 ± 4.5 | 30.1 ± 4.6 | 27.7 ± 4.6 | 24.6 ± 4.4 | 22.7 ± 4.2 |
| Xfactor | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 0.99 |
| 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 | 1.03 | - | 0.79 | 0.68 | 0.62 | 0.60 | 0.58 | 0.57 | 0.57 | 0.57 | 0.59 | 0.60 |
MACS:
Reference: tendl15,endfb71,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: 2016
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: Selenium