6533b7d5fe1ef96bd1264957
RESEARCH PRODUCT
Production of zero energy radioactive beams through extraction across superfluid helium surface
Juha ÄYstöJuha ÄYstöK. GloosWenxue HuangJukka P. PekolaN. TakahashiPeter Dendoovensubject
Materials scienceIon beamSpectrometerLiquid heliumSNOWBALLSAlpha particleNUCLEAR-SPIN POLARIZATIONCondensed Matter PhysicsElectronic Optical and Magnetic Materialslaw.inventionIonimpurities in superfluid heliumlawradioactive snowballsElectric fieldSecond soundPhysics::Accelerator PhysicsElectrical and Electronic EngineeringAtomic physicssecond sound waveradioactive ion beamsSuperfluid helium-4LIQUID HELIUMCORE IONSdescription
A radioactive Ra-223 source was immersed in superfluid helium at 1.2-1.7 K. Electric fields transported recoiled Rn-219 ions in the form of snowballs to the surface and further extracted them across the surface. The ions were focussed onto an aluminium foil and alpha particle spectra were taken with a surface barrier spectrometer. This enabled us to determine the efficiency for each process unambiguously. The pulsed second sound wave proved effective in enhancing the extraction of positive ions from the surface. Thus we offer a novel method for study of impurities in superfluid helium and propose this method for production of zero energy nuclear beams for use at radioactive ion beam facilities. (C) 2003 Elsevier Science B.V. All rights reserved.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-05-01 | Physica B: Condensed Matter |