Hassium-268

Properties and data of the isotope ²⁶⁸Hs.

Contents

General data

Name of the isotope:Hassium-268; Hs-268Symbol:²⁶⁸Hs or 268108HsMass number A:268 (= number of nucleons)Atomic number Z:108 (= number of protons)Neutrons N:160Isotopic mass:268.13186(30) u (atomic weight of Hassium-268)Nuclide mass:268.0726231 u (calculated nuclear mass without electrons)Mass excess:122.8268 MeVMass defect:2.099630016 u (per nucleus)Nuclear binding energy:1955.79276212 MeV (per nucleus)
7.29773419 MeV (average binding energy per nucleon)Separation energy:S_N = 7.89(30) MeV (first neutron)
S_P = 3.22(39) MeV (first proton)Half-life:0.4(+18-2) sDecay constant λ:1.7328679513999 s^-1Specific activity α:3.893871229477 × 10⁺²¹ Bq g^-1
105239762958.85 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2010

Radioactive Decay

Half-life T_½ = 0.4(+18-2) s respectively 4 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁶⁴Sg	ca. 100 %	9.623(16) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 160) and isobaric (same nucleon number A = 268) with Hassium-268. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 160	Isobar A = 268
102	²⁶²No
103	²⁶³Lr
104	²⁶⁴Rf	²⁶⁸Rf
105	²⁶⁵Db	²⁶⁸Db
106	²⁶⁶Sg	²⁶⁸Sg
107	²⁶⁷Bh	²⁶⁸Bh
108	²⁶⁸Hs	²⁶⁸Hs
109	²⁶⁹Mt	²⁶⁸Mt
110	²⁷⁰Ds	²⁶⁸Ds