Cerium-124

Properties and data of the isotope ¹²⁴Ce.

Contents

General data

Name of the isotope:Cerium-124; Ce-124Symbol:¹²⁴Ce or 12458CeMass number A:124 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:66Isotopic mass:123.93031(32) u (atomic weight of Cerium-124)Nuclide mass:123.8984946 u (calculated nuclear mass without electrons)Mass excess:-64.91582 MeVMass defect:1.095426312 u (per nucleus)Nuclear binding energy:1020.38303707 MeV (per nucleus)
8.22889546 MeV (average binding energy per nucleon)Separation energy:S_N = 12.70(42) MeV (first neutron)
S_P = 3.55(46) MeV (first proton)Half-life:6(2) sDecay constant λ:0.11552453009332 s^-1Specific activity α:5.656138154471 × 10⁺²⁰ Bq g^-1
15286859876.95 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1978

Radioactive Decay

Half-life T_½ = 6(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹²⁴La	100 %	5.34(30) MeV

Parent Nuclides

Direct parent isotope is: ¹²⁴Pr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 66) and isobaric (same nucleon number A = 124) with Cerium-124. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 66	Isobar A = 124
37	¹⁰³Rb
38	¹⁰⁴Sr
39	¹⁰⁵Y
40	¹⁰⁶Zr
41	¹⁰⁷Nb
42	¹⁰⁸Mo
43	¹⁰⁹Tc
44	¹¹⁰Ru	¹²⁴Ru
45	¹¹¹Rh	¹²⁴Rh
46	¹¹²Pd	¹²⁴Pd
47	¹¹³Ag	¹²⁴Ag
48	¹¹⁴Cd	¹²⁴Cd
49	¹¹⁵In	¹²⁴In
50	¹¹⁶Sn	¹²⁴Sn
51	¹¹⁷Sb	¹²⁴Sb
52	¹¹⁸Te	¹²⁴Te
53	¹¹⁹I	¹²⁴I
54	¹²⁰Xe	¹²⁴Xe
55	¹²¹Cs	¹²⁴Cs
56	¹²²Ba	¹²⁴Ba
57	¹²³La	¹²⁴La
58	¹²⁴Ce	¹²⁴Ce
59	¹²⁵Pr	¹²⁴Pr
60	¹²⁶Nd	¹²⁴Nd
61	¹²⁷Pm
62	¹²⁸Sm