Cerium-130m

Properties and data of the isotope ^130mCe.

Contents

Cerium-130m (Ce-130m1) is a high-spin isomer of the isotope cerium-123 with an excitation energy of 2453.6 keV. Its half-life is approximately 100 ns. It decays isomerically via a γ-transition into lower excited states of the same nuclide. This isomeric state is characterized by a high spin position and is studied in the structural physics of neutron-poor rare-earth nuclei.

See also: List of individual Cerium isotopes (and general data sources).

General data

Name of the isotope:Cerium-130m; Ce-130mSymbol:^130mCe or 130m58CeMass number A:130 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:72Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2413793103448 (= neutron-proton ratio)Neutron excess (N-Z):14Excitation energy:2453.6(3) keVIsotopic mass:129.91474(3) u (atomic weight of Cerium-130m)Nuclide mass:129.8829246 u (calculated nuclear mass without electrons)Mass excess:-79.41918 MeVMass defect:1.162985808 u (per nucleus)Nuclear binding energy:1083.31430224 MeV (per nucleus)
8.33318694 MeV (average binding energy per nucleon)Half-life:100(8) nsDecay constant λ:6931471.8055995 s^-1Specific activity α:3.235837176744 × 10⁺²⁸ Bq g^-1
8.745505883092 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(7-)Year of discovery:1999

Radioactive Decay

Half-life T_½ = 100(8) ns respectively 1 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹³⁰Ce	100 %

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
¹³⁰Ce		22.9(5) min	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 72) and isobaric (same nucleon number A = 130) with Cerium-130m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 72	Isobar A = 130
40	¹¹²Zr
41	¹¹³Nb
42	¹¹⁴Mo
43	¹¹⁵Tc
44	¹¹⁶Ru
45	¹¹⁷Rh
46	¹¹⁸Pd
47	¹¹⁹Ag	¹³⁰Ag
48	¹²⁰Cd	¹³⁰Cd
49	¹²¹In	¹³⁰In
50	¹²²Sn	¹³⁰Sn
51	¹²³Sb	¹³⁰Sb
52	¹²⁴Te	¹³⁰Te
53	¹²⁵I	¹³⁰I
54	¹²⁶Xe	¹³⁰Xe
55	¹²⁷Cs	¹³⁰Cs
56	¹²⁸Ba	¹³⁰Ba
57	¹²⁹La	¹³⁰La
58	¹³⁰Ce	¹³⁰Ce
59	¹³¹Pr	¹³⁰Pr
60	¹³²Nd	¹³⁰Nd
61	¹³³Pm	¹³⁰Pm
62	¹³⁴Sm	¹³⁰Sm
63	¹³⁵Eu	¹³⁰Eu
64	¹³⁶Gd
65	¹³⁷Tb
66	¹³⁸Dy