Cerium-154

Properties and data of the isotope ¹⁵⁴Ce.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

Cerium-154 is a radioisotope of the chemical element cerium, which has 96 neutrons in its atomic nucleus in addition to the element-specific 58 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 154. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ¹⁵⁴Ce is exclusively for academic purposes.

The neutron-rich isotope cerium-154 was produced in 1994 during experiments using a uranium-235 beam of 750 MeV per nucleon directed at a lead-208 target. For identification, the magnetic stiffness of the fragment separator was adjusted, and the particles were characterized using energy loss and time-of-flight measurements. Due to the small number of observed events, the discovery was initially considered preliminary.

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

General data

Name of the isotope:Cerium-154; Ce-154Symbol:¹⁵⁴Ce or 15458CeMass number A:154 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:96Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.6551724137931 (= neutron-proton ratio)Neutron excess (N-Z):38Isotopic mass:153.94394(22) u (atomic weight of Cerium-154)Nuclide mass:153.9121246 u (calculated nuclear mass without electrons)Mass excess:-52.21955 MeVMass defect:1.341743792 u (per nucleus)Nuclear binding energy:1249.82629179 MeV (per nucleus)
8.11575514 MeV (average binding energy per nucleon)Separation energy:S_N = 5.381(283) MeV (first neutron)
S_P = 13.449(361) MeV (first proton)Half-life:722(14) msDecay constant λ:0.96003764620491 s^-1Specific activity α:3.77874636358 × 10⁺²¹ Bq g^-1
102128280096.95 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1994

Radioactive Decay

Half-life T_½ = 722(14) ms respectively 7.22 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵⁴Pr	100 %	5.650(220) MeV
β^-		?	1.28(20) MeV

Parent Nuclides

Direct parent isotope is: ¹⁵⁴La.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 96) and isobaric (same nucleon number A = 154) with Cerium-154. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 96	Isobar A = 154
55	¹⁵¹Cs
56	¹⁵²Ba
57	¹⁵³La	¹⁵⁴La
58	¹⁵⁴Ce	¹⁵⁴Ce
59	¹⁵⁵Pr	¹⁵⁴Pr
60	¹⁵⁶Nd	¹⁵⁴Nd
61	¹⁵⁷Pm	¹⁵⁴Pm
62	¹⁵⁸Sm	¹⁵⁴Sm
63	¹⁵⁹Eu	¹⁵⁴Eu
64	¹⁶⁰Gd	¹⁵⁴Gd
65	¹⁶¹Tb	¹⁵⁴Tb
66	¹⁶²Dy	¹⁵⁴Dy
67	¹⁶³Ho	¹⁵⁴Ho
68	¹⁶⁴Er	¹⁵⁴Er
69	¹⁶⁵Tm	¹⁵⁴Tm
70	¹⁶⁶Yb	¹⁵⁴Yb
71	¹⁶⁷Lu	¹⁵⁴Lu
72	¹⁶⁸Hf	¹⁵⁴Hf
73	¹⁶⁹Ta
74	¹⁷⁰W
75	¹⁷¹Re
76	¹⁷²Os
77	¹⁷³Ir
78	¹⁷⁴Pt
79	¹⁷⁵Au
80	¹⁷⁶Hg
81	¹⁷⁷Tl
82	¹⁷⁸Pb