Moscovium-287

Properties and data of the isotope ²⁸⁷Mc.

Contents

Moscovium-287 is a radioisotope of the chemical element Moscovium, which, in addition to the element-specific 115 protons, has 172 neutrons in the atomic nucleus, resulting in the mass number 287. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with ²⁸⁷Mc is for academic purposes only.

The discovery and detection of the isotope was first reported in 2003; the synthesis succeeded through the nuclear reaction:

²⁴³Am(⁴⁸Ca, 4n).

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

General data

Name of the isotope:Moscovium-287; Mc-287Symbol:²⁸⁷Mc or 287115McMass number A:287 (= number of nucleons)Atomic number Z:115 (= number of protons)Neutrons N:172Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.495652173913 (= neutron-proton ratio)Neutron excess (N-Z):57Isotopic mass:287.19082(48) u (atomic weight of Moscovium-287)Nuclide mass:287.1277445 u (calculated nuclear mass without electrons)Mass excess:177.74769 MeVMass defect:2.199424232 u (per nucleus)Nuclear binding energy:2048.75047556 MeV (per nucleus)
7.1385034 MeV (average binding energy per nucleon)Separation energy:
S_P = 1.147(705) MeV (first proton)Half-life:37 msDecay constant λ:18.733707582701 s^-1Specific activity α:3.930906825501 × 10⁺²² Bq g^-1
1062407250135.5 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2004

Radioactive Decay

Half-life T_½ = 37 ms respectively 3.7 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁸³Nh	≥ 75 %	10.760(71) MeV
SZ	div	≤ 25 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 172) and isobaric (same nucleon number A = 287) with Moscovium-287. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.