6533b85bfe1ef96bd12bb443
RESEARCH PRODUCT
The performance of the cryogenic buffer-gas stopping cell of SHIPTRAP
P. ChhetriMichael BlockM. EibachS. RaederNasser Kalantar-nayestanakiS. GötzE. Minaya RamirezA. K. MistryJulia EvenKlaus BlaumSergey EliseevLutz SchweikhardT. MurböckC. DroeseB. AnđelićCh. E. DüllmannM. LaatiaouiF. GiacoppoO. KalejaO. KalejaP. G. Thirolfsubject
Speichertechnik - Abteilung BlaumNuclear and High Energy PhysicsMaterials scienceDIRECT MASS MEASUREMENTSProtonBuffer gaschemistry.chemical_elementPenning trapsMass spectrometry7. Clean energy01 natural sciencesFusion-evaporation reaction productsNuclear physicsIonization0103 physical sciencesCalibrationStopping and extraction efficiencyNuclide010306 general physicsInstrumentationCALIBRATION[PHYS]Physics [physics]nobeliumSPECTROSCOPYMass spectrometry010308 nuclear & particles physicsTransfermium elementsCryogenic gas stopping cellExtraction timeHEAVIEST ELEMENTSchemistryIONIZATIONNobeliumOrder of magnitudedescription
Direct high-precision mass spectrometry of the heaviest elements with SHIPTRAP, at GSI in Darmstadt, Germany, requires high efficiency to deal with the low production rates of such exotic nuclides. A second-generation gas stopping cell, operating at cryogenic temperatures, was developed and recently integrated into the relocated system to boost the overall efficiency. Offline measurements using 223Ra and 225Ac recoil-ion sources placed inside the gas volume were performed to characterize the gas stopping cell with respect to purity and extraction efficiency. In addition, a first online test using the fusion-evaporation residue 254No was performed, resulting in a combined stopping and extraction efficiency of 33(5)%. An extraction time of 55(44) ms was achieved. The overall efficiency of SHIPTRAP for fusion-evaporation reaction products was increased by an order of magnitude to 6(1)%. This will pave the way for direct mass spectrometry of heavier and more exotic nuclei, eventually in the region of superheavy elements with proton numbers .
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-09-16 |