Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Chromium (Z=24)
  50Cr   51Cr   52Cr   53Cr   54Cr
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
53Cr 54Cr




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.041.5 ± 10.4--
0.058 ± 10--

(Version 0.0 corresponds to Bao et al.)
Comment
New rec. value and MACS vs. kT table taken from TENDL-2015. Assuming 25% uncertainty (Cp. to uncertainty of 17% in KAM77b). Note that there is a large discrepancy (factor f= 1.4 and higher) between the data from KAM77b, BSE74,BeS75 and the values from the evaluated libraries (for 50,53,54Cr). More investigation of the discrepancies needed!
Last review: May 2016
List of all available values
originalrenorm.yeartypeCommentRef
58 ± 10
1977c,2Linac, TOF, 6Li, Au+Ti:Sat., k=1.0737KAM77b
61 ± 24
63 ± 251975cVdG, TOF, Au:596mb Kom69; renorm. by 613/596= 1.029BSE74,BeS75
41.5
2015eTENDL-2015 using the TALYS codetendl15
26.0
2011eENDF/B-VII.1endfb71
26.2
2011eJENDL-4.0jendl40
31.4
2006eENDF/B-VII.0endfb7
31.4
2004eJEFF-3.1jeff31
31.8
2002eJENDL-3.3jendl33
40 ± 5
1971eAGM71
35.1
2005tMOST 2005Gor05
39.7
2002tMOST 2002Gor02
26
2000tNON-SMOKERRaT99
24
1978tWFH78


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
2Including k from Ref. ABM82, where k is a correction factor which has been applied to the originally reported cross section
eEvaluated value taken directly from the reference
tTheoretical value
MACS, SEF and Reaction Rates for different energies
Energy5keV8keV10keV15keV20keV25keV30keV40keV50keV60keV80keV100keV
MACS
233.9
-
128.4
84.4
62.3
49.6
41.5 ± 10.4
31.8
26.1
22.3
17.2
14.0
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
1.40
-
1.08
0.87
0.74
0.66
0.61
0.54
0.49
0.46
0.41
0.37

MACS:
Reference: KAM77b,BSE74,BeS75,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 107 cm3/mole/s, including SEF
Chart of nuclei
up
left
53Fe
8.51 m
β+
54Fe
5.845
27.6 mb
55Fe
2.74 a
75 mb, β+
56Fe
91.754
11.7 mb
57Fe
2.119
40 mb
52Mn
5.59 d
β+
53Mn
3.74 Ma
β+
54Mn
312.15 d
β+
55Mn
100
39.6 mb
56Mn
2.58 h
β-
51Cr
27.70 d
87 mb, β+
52Cr
83.789
8.8 mb
53Cr
9.501
58 mb
54Cr
2.365
6.7 mb
55Cr
3.50 m
β-
50V
0.25
50 mb
51V
99.75
38 mb
52V
3.74 m
β-
53V
1.60 m
β-
54V
49.80 s
β-
49Ti
5.41
22.1 mb
50Ti
5.18
3.6 mb
51Ti
5.76 m
β-
52Ti
1.70 m
β-
53Ti
32.70 s
β-
right
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Style: (S, M, L, XL or Alberto)


Isotope: Chromium