Lutetium-154

Properties and data of the isotope ¹⁵⁴Lu.

Content

Lutetium-154 is a radioisotope of the chemical element lutetium, which, in addition to the element-specific 71 protons, has 83 neutrons in the atomic nucleus, resulting in the mass number 154. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with ¹⁵⁴Lu is for academic purposes only.

General data

Name of the isotope:Lutetium-154; Lu-154Symbol:¹⁵⁴Lu or 15471LuMass number A:154 (= number of nucleons)Atomic number Z:71 (= number of protons)Neutrons N:83Isotopic mass:153.95742(22) u (atomic weight of Lutetium-154)Nuclide mass:153.9184745 u (calculated nuclear mass without electrons)Mass excess:-39.66301 MeVMass defect:1.3173453 u (per nucleus)Nuclear binding energy:1227.09924288 MeV (per nucleus)
7.9681769 MeV (average binding energy per nucleon)Half-life:Spin and parity:
(nuclear angular momentum)(2-)Year of discovery:1981

Parent Nuclides

Direct parent isotope is: ¹⁵⁸Ta.

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
^154m1Lu	+x	1.12(8) s	(9+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 83) and isobaric (same nucleon number A = 154) with Lutetium-154. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 83	Isobar A = 154
46	¹²⁹Pd
47	¹³⁰Ag
48	¹³¹Cd
49	¹³²In
50	¹³³Sn
51	¹³⁴Sb
52	¹³⁵Te
53	¹³⁶I
54	¹³⁷Xe
55	¹³⁸Cs
56	¹³⁹Ba
57	¹⁴⁰La	¹⁵⁴La
58	¹⁴¹Ce	¹⁵⁴Ce
59	¹⁴²Pr	¹⁵⁴Pr
60	¹⁴³Nd	¹⁵⁴Nd
61	¹⁴⁴Pm	¹⁵⁴Pm
62	¹⁴⁵Sm	¹⁵⁴Sm
63	¹⁴⁶Eu	¹⁵⁴Eu
64	¹⁴⁷Gd	¹⁵⁴Gd
65	¹⁴⁸Tb	¹⁵⁴Tb
66	¹⁴⁹Dy	¹⁵⁴Dy
67	¹⁵⁰Ho	¹⁵⁴Ho
68	¹⁵¹Er	¹⁵⁴Er
69	¹⁵²Tm	¹⁵⁴Tm
70	¹⁵³Yb	¹⁵⁴Yb
71	¹⁵⁴Lu	¹⁵⁴Lu
72	¹⁵⁵Hf	¹⁵⁴Hf
73	¹⁵⁶Ta
74	¹⁵⁷W