Hassium-277

Properties and data of the isotope ²⁷⁷Hs.

Contents

General data

Name of the isotope:Hassium-277; Hs-277Symbol:²⁷⁷Hs or 277108HsMass number A:277 (= number of nucleons)Atomic number Z:108 (= number of protons)Neutrons N:169Isotopic mass:277.15190(58) u (atomic weight of Hassium-277)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)Separation energy:S_N = 4.86(93) MeV (first neutron)Half-life:3(+15-1) msDecay constant λ:231.04906018665 s^-1Specific activity α:5.023140743682 × 10⁺²³ Bq g^-1
13576056064006 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Year of discovery:2010

Radioactive Decay

Half-life T_½ = 3(+15-1) ms respectively 3 × 10^-3 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
^277mHs	+x keV	0.6(+27-3) min

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-277. 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