As of 2026-09-11 · the last 10 years
Neptunium’s research intensity has declined steadily over the last decade, currently sitting at about 25% of its all-time peak, a level reached in 1964.
Research intensity ran from about 33% of the element's own all-time peak in 2016 to about 25% in 2026 — a steady decline, and the all-time peak (1964) lies before this window. Over the same span its share of research attention across all elements fell. Among the 118 elements, neptunium has one of the smaller research literatures of any element.
The number of papers involving the element rose from about 274 in 2016 to about 354 in 2025 (1.29x). That is slower than the literature as a whole grew over the same years, so the element lost ground in the wider body of research even as its own count rose.
The core of neptunium research remains anchored in Neptunium Separation and Oxidation in Actinide Chemistry, which accounts for about 57% of the element's recent research. This community focuses on solvent extraction, redox behavior, and complexation of neptunium alongside uranium and plutonium for nuclear fuel reprocessing, with distinctive work on oxidation states and acid solutions. Neptunium is a minor presence in this much larger community, appearing in about 4% of its papers. The share of neptunium research in this area has remained steady. A key anchor is a 2017 paper in Nature Communications on the role of 5f valence orbitals in chemical bonding, cited over 220 times, alongside recent 2025 work on breaking the neptunyl barrier via polyoxometalate-mediated reduction, cited about 9 times.
A second major area is Neptunium Separation from Uranium and Plutonium Streams, representing about 15% of recent research. Here, papers focus on solvent extraction and liquid membrane techniques to isolate neptunium from uranium and plutonium in spent nuclear fuel. Neptunium is a minor presence in this community, involved in about 2% of its papers. The share has held steady. Notable work includes a 2023 review in Sustainable Chemistry for the Environment on radionuclides in water bodies, cited about 31 times, and a 2023 analytical method for determining neptunium isotopes in seawater, cited about 19 times.
The third material community is Neptunium Transmutation in Water Reactor Fuel Cycles, holding about 14% of the element's research. This group examines neptunium as a minor actinide target for transmutation within pressurized water reactor and subcritical systems. Neptunium is a minor presence here, involved in about 1% of the community's papers. The share has remained steady. The most cited paper in this area is a 2025 study in Advanced Science on optimal neutron spectrum databases for plutonium production, cited about 28 times.
Overall, the composition of neptunium research has remained remarkably stable across the two five-year periods, with no single community gaining or losing significant share. The remainder of the literature, comprising other smaller communities, holds about 13% of the research and has also remained steady.
For a deeper look at the current state of neptunium research, see the element's Last 12 Months and Executive Brief reports.
What changed in the past year: new papers, shifting applications, emerging collaborators. See the momentum over a shorter window than the decade view.
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