ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
At the 88 Inch Cyclotron at the Lawrence Berkeley National Laboratory (LBNL) we have developed an intense (3×107 pps), low-energy 14O ion beam for precision tests of the standard model. The 70 s half-life of 14O requires on-line production of the isotope. 14O is produced in the form of 12C14O in a high-temperature carbon aerogel target using a 20 MeV 3He beam from the LBNL 88 Inch Cyclotron via the reaction 12C(3He,n)14O. In order to minimize the background radiation for the experiments, the 14O atoms must be separated from the other radioactive isotopes produced in the carbon target. For this purpose, we have developed an experimental setup including the target, transfer line, the electron cyclotron resonance ion source IRIS, and a low-energy ion beam transport line. The major components of the setup are described. The release and transport efficiency for the CO molecules from the target through the transfer line was measured for various target temperatures. The on-line and off-line ion source efficiencies for radioactive and stable oxygen beams are presented. © 2002 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1432458
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