Livermorium-289

Properties and data of the isotope ²⁸⁹Lv.

Contents

Livermorium-289 is a radioisotope of the chemical element livermorium, which has 173 neutrons in its atomic nucleus in addition to the element-specific 116 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 289. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ²⁸⁹Lv is exclusively for academic purposes.

The superheavy isotope was first described in 2024/25; according to this, livermorium-289 was first produced by the nuclear reaction ²⁴²Pu(⁵⁰Ti,3n)²⁸⁹Lv between plutonium-242 and titanium-50 ions. The report gives a half-life for the ²⁸⁹Lv nuclide of T_1/2 = 2.4+4.4-0.9 ms and an alpha particle energy of E_α = 10.90 MeV, with flerovium-285 as the direct decay product.

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

General data

Name of the isotope:Livermorium-289; Lv-289Symbol:²⁸⁹Lv or 289116LvMass number A:289 (= number of nucleons)Atomic number Z:116 (= number of protons)Neutrons N:173Isotopic mass:289.19802(54) u (atomic weight of Livermorium-289)Nuclide mass:289.1343962 u (calculated nuclear mass without electrons)Mass excess:184.45444 MeVMass defect:2.20871418 u (per nucleus)Nuclear binding energy:2057.40400638 MeV (per nucleus)
7.119045 MeV (average binding energy per nucleon)Half-life:2.4 msDecay constant λ:288.81132523331 s^-1Specific activity α:6.018209282006 × 10⁺²³ Bq g^-1
16265430491911 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2024

Radioactive Decay

Half-life T_½ = 2.4 ms respectively 2.4 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	Details	γ energy (intensity)
α	²⁸⁵Fl	100 %		E_{α = 10.90 MeV}

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 173) and isobaric (same nucleon number A = 289) with Livermorium-289. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 173	Isobar A = 289
109	²⁸²Mt
111	²⁸⁴Rg
112	²⁸⁵Cn
113	²⁸⁶Nh
114	²⁸⁷Fl	²⁸⁹Fl
115	²⁸⁸Mc	²⁸⁹Mc
116	²⁸⁹Lv	²⁸⁹Lv

Literature and References

[1] - Yu. Ts. Oganessian, V. K. Utyonkov, F. Sh. Abdullin et al.:
Investigation of reactions with ⁵⁰Ti and ⁵⁴Cr for the synthesis of new elements.
In: Physical Review C, 112, 014603, (2025), DOI 10.1103/k2g4-5k7x.