Hassium-277m

Properties and data of the isotope ^277mHs.

Contents

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

General data

Name of the isotope:Hassium-277m; Hs-277mSymbol:^277mHs or 277m108HsMass number A:277 (= number of nucleons)Atomic number Z:108 (= number of protons)Neutrons N:169Excitation energy:+x keVIsotopic mass:277.15190(58) u (atomic weight of Hassium-277m)Nuclide mass:277.0926631 u (calculated nuclear mass without electrons)Mass excess:141.49394 MeVMass defect:2.15757426 u (per nucleus)Nuclear binding energy:2009.76747774 MeV (per nucleus)
7.25547826 MeV (average binding energy per nucleon)Half-life:0.6(+27-3) minDecay constant λ:0.019254088348887 s^-1Specific activity α:4.185950619735 × 10⁺¹⁹ Bq g^-1
1131338005.3339 Ci g^-1Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Half-life T_½ = 0.6(+27-3) min respectively 3.6 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
SF		100 %

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
²⁷⁷Hs		3(+15-1) ms	3/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 169) and isobaric (same nucleon number A = 277) with Hassium-277m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 169	Isobar A = 277
107	²⁷⁶Bh	²⁷⁷Bh
108	²⁷⁷Hs	²⁷⁷Hs
109	²⁷⁸Mt	²⁷⁷Mt
110	²⁷⁹Ds	²⁷⁷Ds
111	²⁸⁰Rg	²⁷⁷Rg
112	²⁸¹Cn	²⁷⁷Cn
113	²⁸²Nh