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Cerium-127

Properties and data of the isotope 127Ce.


Contents

See also: list of Cerium isotopes.

 

General data

Name of the isotope:Cerium-127; Ce-127Symbol:127Ce or 12758CeMass number A:127 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:69Isotopic mass:126.92273(3) u (atomic weight of Cerium-127)Nuclide mass:126.8909146 u (calculated nuclear mass without electrons)Mass excess:-71.97654 MeVMass defect:1.12900106 u (per nucleus)Nuclear binding energy:1051.65771338 MeV (per nucleus)
8.2807694 MeV (average binding energy per nucleon)
Separation energy:SN = 9.23(4) MeV (first neutron)
SP = 4.29(9) MeV (first proton)
Half-life:34(2) sDecay constant λ:0.020386681781175 s-1Specific activity α:9.743767408963 × 10+19 Bq g-1
2633450651.0712 Ci g-1
Spin and parity:
(nuclear angular momentum)
1/2+Year of discovery:1978

 

Radioactive Decay

Half-life T½ = 34(2) s respectively 3.4 × 101 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+127La100 %5.92(4) MeV

 

Parent Nuclides

Direct parent isotope is: 127Pr.

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
127mCe7.3(11) keV28.6(7) s(5/2+)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 69) and isobaric (same nucleon number A = 127) with Cerium-127. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 69Isobar A = 127
38107Sr
39108Y
40109Zr
41110Nb
42111Mo
43112Tc
44113Ru
45114Rh127Rh
46115Pd127Pd
47116Ag127Ag
48117Cd127Cd
49118In127In
50119Sn127Sn
51120Sb127Sb
52121Te127Te
53122I127I
54123Xe127Xe
55124Cs127Cs
56125Ba127Ba
57126La127La
58127Ce127Ce
59128Pr127Pr
60129Nd127Nd
61130Pm127Pm
62131Sm
63132Eu

 

External data and identifiers

Adopted Levels, Gammas:NuDat 127Ce

 


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Last update: 2020-10-19


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