Moscovium (₁₁₅Mc) is asynthetic element, and thus astandard atomic weight cannot be given. Like all synthetic elements, it has no knownstable isotopes. The firstisotope to be synthesized was²⁸⁸Mc in 2004. There are five knownradioisotopes from²⁸⁶Mc to²⁹⁰Mc. The longest-lived isotope is²⁹⁰Mc with ahalf-life of 0.65 seconds.

The isotopes undergoalpha decay into the correspondingisotope of nihonium, with half-lives increasing as neutron numbers increase.

The table below contains various combinations of targets and projectiles which could be used to form compound nuclei withZ = 115. Each entry is a combination for which calculations have provided estimates for cross section yields from various neutron evaporation channels. The channel with the highest expected yield is given.

Hot fusion reactions are processes that create compound nuclei at high excitation energy (~40–50 MeV, hence "hot"), leading to a reduced probability of survival from fission. The excited nucleus then decays to the ground state via the emission of 3–5 neutrons. Fusion reactions utilizing⁴⁸Ca nuclei usually produce compound nuclei with intermediate excitation energies (~30–35 MeV) and are sometimes referred to as "warm" fusion reactions. This leads, in part, to relatively high yields from these reactions.

There are strong indications that this reaction was performed in late 2004 as part of a uranium(IV) fluoride target test at the GSI. No reports have been published, suggesting that no product atoms were detected, as anticipated by the team.^[9]

This reaction was first performed by the team in Dubna in July–August 2003. In two separate runs they were able to detect 3 atoms of²⁸⁸Mc and a single atom of²⁸⁷Mc. The reaction was studied further in June 2004 in an attempt to isolate the descendant²⁶⁸Db from the²⁸⁸Mc decay chain. After chemical separation of a +4/+5 fraction, 15 SF decays were measured with a lifetime consistent with²⁶⁸Db. In order to prove that the decays were from dubnium-268, the team repeated the reaction in August 2005 and separated the +4 and +5 fractions and further separated the +5 fractions into tantalum-like and niobium-like ones. Five SF activities were observed, all occurring in the niobium-like fractions and none in the tantalum-like fractions, proving that the product was indeed isotopes of dubnium.

In a series of experiments between October 2010 – February 2011, scientists at the FLNR studied this reaction at a range of excitation energies. They were able to detect 21 atoms of²⁸⁸Mc and one atom of²⁸⁹Mc, from the 2n exit channel. This latter result was used to support the synthesis oftennessine. The 3n excitation function was completed with a maximum at ~8 pb. The data was consistent with that found in the first experiments in 2003.

This reaction was run again at five different energies in 2021 to test the new gas-filled separator at Dubna's SHE-factory. They detected 6 chains of²⁸⁹Mc, 58 chains of²⁸⁸Mc, and 2 chains of²⁸⁷Mc. For the first time the 5n channel was observed with 2 atoms of²⁸⁶Mc.^[10]

This reaction was studied by the team in Dubna in 2024. For the first time, a pxn reaction was successful with actinide targets and⁴⁸Ca/⁵⁰Ti/⁵⁴Cr projectiles, producing one atom of the known²⁸⁹Mc in the p2n channel (evaporating one proton and two neutrons).^[11]

The table below provides cross-sections and excitation energies for hot fusion reactions producing moscovium isotopes directly. Data in bold represent maxima derived from excitation function measurements. + represents an observed exit channel.

Theoretical calculations using a quantum-tunneling model support the experimental alpha-decay half-lives.^[12]

The table below contains various target-projectile combinations for which calculations have provided estimates for cross section yields from various neutron evaporation channels. The channel with the highest expected yield is given.

MD = multi-dimensional; DNS = Di-nuclear system; σ = cross section

• Half-life, spin, and isomer data selected from the following sources.
  • Audi, Georges; Bersillon, Olivier; Blachot, Jean;Wapstra, Aaldert Hendrik (2003),"The NUBASE evaluation of nuclear and decay properties",Nuclear Physics A,729:3–128,Bibcode:2003NuPhA.729....3A,doi:10.1016/j.nuclphysa.2003.11.001
  • National Nuclear Data Center."NuDat 3.0 database".Brookhaven National Laboratory.
  • Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.).CRC Handbook of Chemistry and Physics (85th ed.).Boca Raton, Florida:CRC Press.ISBN 978-0-8493-0485-9.

• Isotopes of moscovium
• Moscovium
• Lists of isotopes by element

• Articles with short description
• Short description is different from Wikidata