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RESEARCH PRODUCT

Study of the average charge states of 188Pb and 252,254No ions at the gas-filled separator TASCA

Alexander YakushevA. TuerlerM. SchaedelA. SemchenkovDieter AckermannR. GraegerA. SerovB. SchaustenE. JaegerH. SchaffnerMoumita MaitiJ. BallofKlaus EberhardtDirk RudolphW. BruechleJulia EvenJ. V. KratzLise-lotte AnderssonA. V. GorshkovRobert HoischenE. MerchanE. MerchanBettina LommelJadambaa KhuyagbaatarBirgit KindlerF. P. HessbergerSusanta LahiriJ. DvorakD. HildCh. E. DuellmannE. Schimpf

subject

PhysicsNuclear and High Energy PhysicsHelium gasHydrogen010308 nuclear & particles physicschemistry.chemical_elementSeparator (oil production)Magnetic separatorActinideAverage charge stateAccelerator Physics and Instrumentation01 natural sciencesRecoil separatorGas-filled separatorIonchemistry0103 physical sciencesTASCAPhysics::Atomic PhysicsAtomic physics010306 general physicsHeavy ionInstrumentationHelium

description

The average charge states of Pb-188 and No-252,No-254 ions in dilute helium gas were measured at the gas-filled recoil separator TASCA. Hydrogen gas was also used as a filling gas for measurements of the average charge state of No-254. Helium and hydrogen gases at pressures from 0.2 mbar to 2.0 mbar were used. A strong dependence of the average charge state on the pressure of the filling gases was observed for both, helium and hydrogen. The influence of this dependence, classically attributed to the so-called "density effect", on the performance of TASCA was investigated. The average charge states of No-254 ions were also measured in mixtures of helium and hydrogen gases at low gas pressures around 1.0 mbar. From the experimental results simple expressions for the prediction of average charge states of heavy ions moving in rarefied helium gas, hydrogen gas, and in their mixture were derived. (C) 2012 Elsevier B.V. All rights reserved.

yearjournalcountryeditionlanguage
2012-10-01Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detecto
10.1016/j.nima.2012.06.007http://dx.doi.org/10.1016/j.nima.2012.06.007