Flerovium-287

Properties and data of the isotope ²⁸⁷Fl.

Content

Flerovium-287 is a radioisotope of the chemical element flerovium, which, in addition to the element-specific 114 protons, has 173 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 ²⁸⁷Fl is for academic purposes only.

General data

Name of the isotope:Flerovium-287; Fl-287Symbol:²⁸⁷Fl or 287114FlMass number A:287 (= number of nucleons)Atomic number Z:114 (= number of protons)Neutrons N:173Isotopic mass:287.18672(66) u (atomic weight of Flerovium-287)Nuclide mass:287.1241929 u (calculated nuclear mass without electrons)Mass excess:173.92856 MeVMass defect:2.204364116 u (per nucleus)Nuclear binding energy:2053.35194787 MeV (per nucleus)
7.1545364 MeV (average binding energy per nucleon)Separation energy:S_N = 5.748(826) MeV (first neutron)
S_P = 3.317(854) MeV (first proton)Half-life:0.40 sDecay constant λ:1.7328679513999 s^-1Specific activity α:3.636088813588 × 10⁺²¹ Bq g^-1
98272670637.535 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2004

Radioactive Decay

Half-life T_½ = 0.40 s respectively 4 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁸³Cn	> 95 %	10.167(52) MeV
SF	div	< 5 %

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
^287mFl

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 173) and isobaric (same nucleon number A = 287) with Flerovium-287. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.