Электронный каталог

Статья

Jia, Z.
LEGEND - A Detection System for Next-Generation Gas-Adsorption Thermochromatography Experiments with Nh / Z.Jia, N.Aksenov, A.Astakhov, G.Bozhikov, A.Madumarov, [a.o.] // Nuclear Instruments & Methods in Physics Research A [Electronic resource]. – 2025. – Vol. 1072. – P. 170166. – URL: https://doi.org/10.1016/j.nima.2024.170166. – Bibliogr.: 42.

In the field of superheavy element chemistry, the study of the chemical properties of nihonium (Nh, Z = 113) is currently in the focus. To chemically characterize Nh, fast gas-phase chemistry experiments are essential. Hereto, a new thermochromatographic detection system named LEGEND has been developed for chemistry experiments behind the gas-filled recoil separators SHANS/SHANS2. The presented system will be further developed to higher starting point temperatures of the negative temperature gradient, thereby enabling the investigation of less volatile chemical species. A recoil transfer chamber with a vacuum window acts as an interface between the separator and the thermochromatography detector array, whereas a gas circulation and purification system ensures the required high gas purities. Finally, a state-of-the-art data acquisition system allows for event-by-event α-particle and spontaneous fission fragment spectroscopy. The measurement efficiency of detecting α-particles adsorbed on the active surface is 89.1%. Using the nuclear fusion-evaporation reactions &sup(169)Tm(&sup(40)Ar, xn)&sup(204-206)Fr and &sup(153)Eu(&sup(40)Ar, xn)&sup(184-185)Tl, short-lived radioisotopes 205Fr (t&sub(1/2) = 3.92 s) and &sup(185)Tl (t&sub(1/2) = 1.93 s) were produced for first online experiments behind SHANS. The herein presented results render the LEGEND system suitable for gas adsorption chromatography experiments with short-lived &sup(284)Nh (t&sub(1/2) ≈ 0.77 s).



Спец.(статьи,препринты) = С 344.1 - Методы и аппаратура для регистрации элементарных частиц и фотонов$
Спец.(статьи,препринты) = С 413 - Радиохимия
ОИЯИ = ОИЯИ (JINR)2025