Hassium-272

Properties and data of the isotope ²⁷²Hs.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

Hassium-272 is a radioisotope of the chemical element Hassium, which, in addition to the element-specific 108 protons, has 164 neutrons in the atomic nucleus, resulting in the mass number 272. The superheavy nuclide ²⁷²Hs was first reported in 2023 as part of the synthesis of the isotope darmstadtium-276, in which the Hassium nuclide was observed as an α-decay product [1].

The very short-lived, unstable and therefore radioactive nuclide has no practical significance; The study of ²⁷²Hs serves exclusively academic purposes.

General data

Name of the isotope:Hassium-272; Hs-272Symbol:²⁷²Hs or 272108HsMass number A:272 (= number of nucleons)Atomic number Z:108 (= number of protons)Neutrons N:164Isotopic mass:272.13850(55) u (atomic weight of Hassium-272)Nuclide mass:272.0792631 u (calculated nuclear mass without electrons)Mass excess:129.01192 MeVMass defect:2.12764968 u (per nucleus)Nuclear binding energy:1981.89291102 MeV (per nucleus)
7.286371 MeV (average binding energy per nucleon)Half-life:160 msDecay constant λ:4.3321698784997 s^-1Specific activity α:9.591521043198 × 10⁺²¹ Bq g^-1
259230298464.82 Ci g^-1Spin and parity:
(nuclear angular momentum)0+

Radioactive Decay

Half-life T_½ = 160 ms respectively 1.60 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁶⁸Sg	100 %	9.63 MeV

Parent Nuclides

Direct parent isotope is: ²⁷⁶Ds.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 164) and isobaric (same nucleon number A = 272) with Hassium-272. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 164	Isobar A = 272
104	²⁶⁸Rf
105	²⁶⁹Db
106	²⁷⁰Sg
107	²⁷¹Bh	²⁷²Bh
108	²⁷²Hs	²⁷²Hs
109	²⁷³Mt	²⁷²Mt
110	²⁷⁴Ds	²⁷²Ds
111	²⁷⁵Rg	²⁷²Rg