Roentgenium-286

Properties and data of the isotope ²⁸⁶Rg.

Content

General data

Name of the isotope:Roentgenium-286; Rg-286Symbol:²⁸⁶Rg or 286111RgMass number A:286 (= number of nucleons)Atomic number Z:111 (= number of protons)Neutrons N:175Isotopic mass:286.178760(490) u (atomic weight of Roentgenium-286)Nuclide mass:286.117878 u (calculated nuclear mass without electrons)Mass excess:166.51387 MeVMass defect:2.206178852 u (per nucleus)Nuclear binding energy:2055.04236356 MeV (per nucleus)
7.18546281 MeV (average binding energy per nucleon)Separation energy:S_N = 5.291(755) MeV MeV (first neutron)Half-life:11 minDecay constant λ:0.0010502230008484 s^-1Specific activity α:2.211395400508 × 10⁺¹⁸ Bq g^-1
59767443.256989 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2016

Radioactive Decay

Half-life T_½ = 11 min (minutes) respectively 6.60 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁸²Mt	ca. 100 %	8.630(100) MeV
SZ	div	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 175) and isobaric (same nucleon number A = 286) with Roentgenium-286. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.