Meitnerium-277

Properties and data of the isotope ²⁷⁷Mt.

Contents

General data

Name of the isotope:Meitnerium-277; Mt-277Symbol:²⁷⁷Mt or 277109MtMass number A:277 (= number of nucleons)Atomic number Z:109 (= number of protons)Neutrons N:168Isotopic mass:277.153530(710) u (atomic weight of Meitnerium-277)Nuclide mass:277.0937447 u (calculated nuclear mass without electrons)Mass excess:143.01227 MeVMass defect:2.155104376 u (per nucleus)Nuclear binding energy:2007.46679562 MeV (per nucleus)
7.24717255 MeV (average binding energy per nucleon)Separation energy:S_N = 6.376(850) MeV (first neutron)
S_P = 2.466(979) MeV (first proton)Half-life:4 msDecay constant λ:173.28679513999 s^-1Specific activity α:3.767355557761 × 10⁺²³ Bq g^-1
10182042048005 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:2013

Radioactive Decay

Half-life T_½ = 4 ms respectively 4 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
SF	div	ca. 100 %
α	²⁷³Bh	≤ 20 %	9.90(10) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 168) and isobaric (same nucleon number A = 277) with Meitnerium-277. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 168	Isobar A = 277
107	²⁷⁵Bh	²⁷⁷Bh
108	²⁷⁶Hs	²⁷⁷Hs
109	²⁷⁷Mt	²⁷⁷Mt
110	²⁷⁸Ds	²⁷⁷Ds
111	²⁷⁹Rg	²⁷⁷Rg
112	²⁸⁰Cn	²⁷⁷Cn
113	²⁸¹Nh