Cerium-127
Properties and data of the isotope 127Ce.
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-1Spin 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 | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 127La | 100 % | 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 Isomer | Excitation Energy | Half-life | Spin |
---|
127mCe | 7.3(11) keV | 28.6(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.
Z | Isotone N = 69 | Isobar A = 127 |
38 | 107Sr | |
39 | 108Y | |
40 | 109Zr | |
41 | 110Nb | |
42 | 111Mo | |
43 | 112Tc | |
44 | 113Ru | |
45 | 114Rh | 127Rh |
46 | 115Pd | 127Pd |
47 | 116Ag | 127Ag |
48 | 117Cd | 127Cd |
49 | 118In | 127In |
50 | 119Sn | 127Sn |
51 | 120Sb | 127Sb |
52 | 121Te | 127Te |
53 | 122I | 127I |
54 | 123Xe | 127Xe |
55 | 124Cs | 127Cs |
56 | 125Ba | 127Ba |
57 | 126La | 127La |
58 | 127Ce | 127Ce |
59 | 128Pr | 127Pr |
60 | 129Nd | 127Nd |
61 | 130Pm | 127Pm |
62 | 131Sm | |
63 | 132Eu | |
External data and identifiers
Last update: 2020-10-19
Perma link: https://www.chemlin.org/isotope/cerium-127
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