Darmstadtium-276

Properties and data of the isotope ²⁷⁶Ds.

Content

Darmstadtium-276 is a radioisotope of the superheavy element Darmstadtium, first described in 2023. The atomic nucleus of the nuclide consists of 166 neutrons and the element-specific 110 protons; the sum of these nucleons is the mass number 276.

The very short-lived, unstable and therefore radioactive nuclide, which can only be produced artificially, has no practical significance; The study of ²⁷⁶Ds is for academic purposes only.

The isotope was synthesized through the reaction between thorium-232 and calcium-48 ; only 7 atoms were created [1].

In the same experiment, two other isotopes were discovered that have not yet been described and that appear as radioactive decay products of ²⁷⁶Ds: hassium-272 and seaborgium-268 (decay scheme: see below).

The following data are calculated values or - based on periodic trends - estimated values!

See also: list of Darmstadtium isotopes.

General data

Name of the isotope:Darmstadtium-276; Ds-276Symbol:²⁷⁶Ds or 276110DsMass number A:276 (= number of nucleons)Atomic number Z:110 (= number of protons)Neutrons N:166Isotopic mass:276.15303(59) u (atomic weight of Darmstadtium-276)Nuclide mass:276.0926963 u (calculated nuclear mass without electrons)Mass excess:142.54653 MeVMass defect:2.146099576 u (per nucleus)Nuclear binding energy:1999.07887845 MeV (per nucleus)
7.24303941 MeV (average binding energy per nucleon)Half-life:0.15 msDecay constant λ:4620.981203733 s^-1Specific activity α:1.008268105797 × 10⁺²⁵ Bq g^-1
2.725048934586 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2022

Radioactive Decay

Half-life T_½ = 0.15 ms respectively 1.5 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁷²Hs	43 %	10.75 MeV
SF	var	57 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 166) and isobaric (same nucleon number A = 276) with Darmstadtium-276. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 166	Isobar A = 276
107	²⁷³Bh	²⁷⁶Bh
108	²⁷⁴Hs	²⁷⁶Hs
109	²⁷⁵Mt	²⁷⁶Mt
110	²⁷⁶Ds	²⁷⁶Ds
111	²⁷⁷Rg	²⁷⁶Rg
112	²⁷⁸Cn
113	²⁷⁹Nh