Darmstadtium

Element 110, darmstadtium, is a superheavy transition metal that exists only in accelerator laboratories. First synthesized in 1994 at GSI Darmstadt, it sits near the theoretical island of stability — a region of the nuclear chart where certain superheavy isotopes might be surprisingly long-lived. So far it remains firmly in the short-lived zone, but its isotopes are among the longest-lived confirmed in its neighborhood of the periodic table.

Darmstadtium serves exclusively as a subject of nuclear physics research. No practical applications exist or are foreseen. Scientists study its isotopes to probe the structure of superheavy nuclei and gather data that tests theoretical predictions about nuclear binding energy and the boundaries of the island of stability.

Sigurd Hofmann and a team at GSI Darmstadt produced the first atoms of element 110 in November 1994 by bombarding lead-208 targets with nickel-62 ions. The fusion reaction yielded just a few atoms over several days of continuous bombardment. Each atom was identified by the chain of alpha decays it triggered, a signature unique enough to confirm the parent nucleus. IUPAC officially named the element darmstadtium in 2003, honoring the German city of Darmstadt where GSI is located and where so many transactinide elements were first created. The symbol Ds was assigned.

Darmstadtium does not exist in nature and cannot be found anywhere outside a particle accelerator. Every atom ever produced has been created deliberately through nuclear fusion reactions. Darmstadtium-281 has a half-life of roughly 12.7 seconds, making it the longest-lived confirmed isotope of the element, though it still decays completely within a fraction of a minute.

No chemical experiments have been performed on darmstadtium. Half-lives are too short and quantities too small to permit any analysis beyond nuclear detection. Darmstadtium sits in Group 10 below platinum and palladium, and theoretical models predict it should share some of their chemical characteristics, but no experimental data is available to test this expectation.

• Darmstadtium-281 has a half-life of about 12.7 seconds, which sounds brief but is long enough to make it one of the more stable isotopes among elements heavier than copernicium.
• The island of stability, a theoretical region where certain superheavy nuclei might persist for hours or even days, is predicted to lie near element 114 — darmstadtium at element 110 is a near neighbor being explored as scientists map the approach to that island.
• GSI Darmstadt has now had two elements named after it — darmstadtium (110) directly, and hassium (108) indirectly through Hassia, the Latin name of the surrounding state of Hesse.
• To produce darmstadtium, the nickel-62 beam must strike a lead-208 target with enough energy to fuse the nuclei but not so much energy that the resulting nucleus immediately flies apart — a window of just a few MeV.
• Because darmstadtium sits between meitnerium and roentgenium, all three of its neighbors in the periodic table were also first synthesized at the same laboratory in Darmstadt within a decade of each other.