Karlsruhe Astrophysical Database of Nucleosynthesis in Stars
s-process
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p-process
Available isotopes for Niobium (Z=41)
  91Nb   92Nb   93Nb   94Nb   95Nb
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Recommended MACS30 (Maxwellian Averaged Cross Section @ 30keV)
93Nb 94Nb




Cross sections do not include stellar enhancement factors!
History
VersionTotal MACS [mb]Partial to gs [mb]Partial to isomer [mb]
1.0276.9 ± 5.3--
0.0266 ± 5--

(Version 0.0 corresponds to Bao et al.)
Comment
Rec. value is from WVK90 norm. by f=1.042. For the new MACS vs. kT table the normalized average from recent evaluated libraries (tendl15,endfb71,jendl40) was used. The uncertainty is 1.9% from WVK90 at kT= 30 keV, and interpolated to the deviation between the libraries for values between kT= 5 and 100 keV.
Last review: January 2017
List of all available values
originalrenorm.yeartypeCommentRef
265.7 ± 5.1
276.9 ± 5.31990cVdG, TOF, Au:RaK88; Mac82e norm. by 613/588= 1.042WVK90
267 ± 13
272.3 ± 13.31982cVdG, TOF, Au:endfb52 norm. by 613/601= 1.02RFW82
260 ± 17
1980bLinac, TOF, 10B:endfb4YSE80
304 ± 17
1978cF.N.B., Act.,1/v(E), 10B, Ag:Sat.YDM78
310 ± 16
1976c,1Linac, TOF, 6Li, Au:Sat., k=1.0737Mac76a
285.5
2015eTENDL-2015 using the TALYS codetendl15
266.1
2014eJEFF-3.2, same as endfb71jeff32
266.1
2011eENDF/B-VII.1; strange unres. res. regionendfb71
265.1
2011eJENDL-4.0jendl40
266.1
2004eJEFF-3.1jeff31
262.1
2002eJENDL-3.3jendl33
255
1997eMug97
285 ± 30
1971eAGM71
241
2005tMOST 2005Gor05
261
2002tMOST 2002Gor02
338
2000tNON-SMOKERRaT99
180-220
1990tKoU90
512
1981tHar81
415
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
bCalculated from smooth cross sections with model fit: ln(sigma) = a + a1 ln(E) + a2 ln^2(E)
1Including k from Ref. MaW81, 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
862 ± 45
-
579 ± 26
447 ± 17
368 ± 12
315 ± 8
277 ± 5
226 ± 5
194 ± 5
171 ± 5
142 ± 4
123 ± 5
Xfactor1.001.000.990.980.970.960.950.940.930.920.910.91
SEF1.001.001.000.990.990.980.980.970.970.970.960.96
Rate
5.12
-
4.86
4.57
4.32
4.12
3.95
3.70
3.54
3.40
3.25
3.14

MACS:
Reference: WVK90,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: 2017

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
93Tc
2.75 h
β+
94Tc
4.88 h
β+
95Tc
20.00 h
β+
96Tc
4.28 d
β+
97Tc
4.21 Ma
β+
92Mo
14.84
70 mb
93Mo
4.00 ka
β+
94Mo
9.25
102 mb
95Mo
15.92
292 mb
96Mo
16.68
112 mb
91Nb
680.04 a
β+
92Nb
34.70 Ma
β+
93Nb
100
266 mb
94Nb
20.30 ka
482 mb, β-
95Nb
34.99 d
310 mb, β-
90Zr
51.45
19.4 mb
91Zr
11.22
60 mb
92Zr
17.15
33 mb
93Zr
1.53 Ma
95 mb, β-
94Zr
17.38
26 mb
89Y
100
19 mb
90Y
2.67 d
β-
91Y
58.51 d
β-
92Y
3.54 h
β-
93Y
10.18 h
β-
right
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Style: (S, M, L, XL or Alberto)


Isotope: Niobium