Hassium-267

Properties and data of the isotope ²⁶⁷Hs.

Content

General data

Name of the isotope:Hassium-267; Hs-267Symbol:²⁶⁷Hs or 267108HsMass number A:267 (= number of nucleons)Atomic number Z:108 (= number of protons)Neutrons N:159Isotopic mass:267.13167(10) u (atomic weight of Hassium-267)Nuclide mass:267.0724331 u (calculated nuclear mass without electrons)Mass excess:122.64981 MeVMass defect:2.0911551 u (per nucleus)Nuclear binding energy:1947.89842872 MeV (per nucleus)
7.29549973 MeV (average binding energy per nucleon)Separation energy:S_N = 6.55(10) MeV (first neutron)
S_P = 2.74(19) MeV (first proton)Half-life:52 msDecay constant λ:13.329753472307 s^-1Specific activity α:3.006503859118 × 10⁺²² Bq g^-1
812568610572.54 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Year of discovery:1995

Radioactive Decay

Half-life T_½ = 52 ms respectively 5.2 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁶³Sg	≥ 80 %	10.038(13) MeV
SZ	div	< 20 %

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
^267mHs		990(90) μs	9-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 159) and isobaric (same nucleon number A = 267) with Hassium-267. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 159	Isobar A = 267
100	²⁵⁹Fm
101	²⁶⁰Md
102	²⁶¹No
103	²⁶²Lr
104	²⁶³Rf	²⁶⁷Rf
105	²⁶⁴Db	²⁶⁷Db
106	²⁶⁵Sg	²⁶⁷Sg
107	²⁶⁶Bh	²⁶⁷Bh
108	²⁶⁷Hs	²⁶⁷Hs
109	²⁶⁸Mt	²⁶⁷Mt
110	²⁶⁹Ds	²⁶⁷Ds