Cerium-120

Properties and data of the isotope ¹²⁰Ce.

Contents

General data

Name of the isotope:Cerium-120; Ce-120Symbol:¹²⁰Ce or 12058CeMass number A:120 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:62Isotopic mass:119.94664(75) u (atomic weight of Cerium-120)Nuclide mass:119.9148246 u (calculated nuclear mass without electrons)Mass excess:-49.70452 MeVMass defect:1.044436648 u (per nucleus)Nuclear binding energy:972.88647099 MeV (per nucleus)
8.10738726 MeV (average binding energy per nucleon)Half-life:250 msDecay constant λ:2.7725887222398 s^-1Specific activity α:1.403102506890 × 10⁺²² Bq g^-1
379216893754.27 Ci g^-1Spin and parity:
(nuclear angular momentum)0+

Radioactive Decay

Half-life T_½ = 250 ms respectively 2.5 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹²⁰La

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 62) and isobaric (same nucleon number A = 120) with Cerium-120. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 62	Isobar A = 120
35	⁹⁷Br
36	⁹⁸Kr
37	⁹⁹Rb
38	¹⁰⁰Sr
39	¹⁰¹Y
40	¹⁰²Zr
41	¹⁰³Nb
42	¹⁰⁴Mo
43	¹⁰⁵Tc	¹²⁰Tc
44	¹⁰⁶Ru	¹²⁰Ru
45	¹⁰⁷Rh	¹²⁰Rh
46	¹⁰⁸Pd	¹²⁰Pd
47	¹⁰⁹Ag	¹²⁰Ag
48	¹¹⁰Cd	¹²⁰Cd
49	¹¹¹In	¹²⁰In
50	¹¹²Sn	¹²⁰Sn
51	¹¹³Sb	¹²⁰Sb
52	¹¹⁴Te	¹²⁰Te
53	¹¹⁵I	¹²⁰I
54	¹¹⁶Xe	¹²⁰Xe
55	¹¹⁷Cs	¹²⁰Cs
56	¹¹⁸Ba	¹²⁰Ba
57	¹¹⁹La	¹²⁰La
58	¹²⁰Ce	¹²⁰Ce
59	¹²¹Pr