Darmstadtium-275

Properties and data of the isotope ²⁷⁵Ds.

Contents

Darmstadtium-275 is a radioisotope of the chemical element darmstadtium, which has 165 neutrons in its atomic nucleus in addition to the element-specific 110 protons, resulting in a mass number of 275. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ²⁷⁵Ds serves exclusively academic purposes.

The synthesis and properties of the superheavy isotope were first reported in 2024; The production of darmstadtium-275 was achieved by bombarding thorium-232 with calcium-48 nuclei:

²³²Th(⁴⁸Ca,5n)²⁷⁵Ds.

The α-decay to Hassium-271 with a half-life of 0.43+0.29-0.12 milliseconds was observed [1].

See also: list of Darmstadtium isotopes.

General data

Name of the isotope:Darmstadtium-275; Ds-275Symbol:²⁷⁵Ds or 275110DsMass number A:275 (= number of nucleons)Atomic number Z:110 (= number of protons)Neutrons N:165Isotopic mass:275.15209(37) u (atomic weight of Darmstadtium-275)Nuclide mass:275.0917563 u (calculated nuclear mass without electrons)Mass excess:141.67092 MeVMass defect:2.13837466 u (per nucleus)Nuclear binding energy:1991.88316554 MeV (per nucleus)
7.24321151 MeV (average binding energy per nucleon)Half-life:0.43 msDecay constant λ:1611.9701873487 s^-1Specific activity α:3.530004192811 × 10⁺²⁴ Bq g^-1
95405518724643 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2Year of discovery:2023

Radioactive Decay

Half-life T_½ = 0.43 ms respectively 4.3 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁷¹Hs		11.20(2) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 165) and isobaric (same nucleon number A = 275) with Darmstadtium-275. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 165	Isobar A = 275
105	²⁷⁰Db
106	²⁷¹Sg
107	²⁷²Bh	²⁷⁵Bh
108	²⁷³Hs	²⁷⁵Hs
109	²⁷⁴Mt	²⁷⁵Mt
110	²⁷⁵Ds	²⁷⁵Ds
111	²⁷⁶Rg	²⁷⁵Rg
112	²⁷⁷Cn
113	²⁷⁸Nh