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Search Completed | Title | OXIDE FIBER TARGETS AT ISOLDE
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Text | OXIDE FIBER TARGETS AT ISOLDE | 001
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
OXIDE FIBER TARGETS AT ISOLDE
U. Ko ̈ster1) U.C. Bergmann1) D. Carminati1) R. Catherall1) J. Cederka ̈ll1) J.G. Correia1) B. Crepieux1) M. Dietrich1) K. Elder1)2) V.N. Fedoseyev1)3) L. Fraile1) S. Franchoo1) H. Fynbo1) U. Georg1) T. Giles1) A. Joinet1) O.C. Jonsson1) R. Kirchner4) Ch. Lau1) J. Lettry1) H.J. Maier5) V.I. Mishin3) M. Oinonen1) K. Pera ̈ja ̈rvi1) H.L. Ravn1)
T. Rinaldi1)6) M. Santana-Leitner1) U. Wahl7) L. Weissman1)
and the ISOLDE Collaboration1)
Many elements are rapidly released from oxide matrices. Some oxide powder targets show a fast sintering, thus losing their favorable release characteristics. Loosely packed oxide fiber targets are less critical since they may maintain their open structure even when starting to fuse together at some contact points.
The experience with various oxide fiber targets (titania, zirconia, ceria and thoria) used in the last years at ISOLDE is reviewed. For short-lived isotopes of Cu, Ga and Xe the zirconia and ceria targets respectively provided significantly higher yields than any other target (metal foils, oxide powders, etc.) tested before.
Titania fibers, which were not commercially available, were produced in a relic pro- cess by impregnation of a rayon felt in a titanium chloride solution and subsequent calcination by heating the dried felt in air. Thoria fibers were obtained either by the same process or by burning commercial gas lantern mantle cloth.
In the future a beryllia fiber target could be used to produce very intense 6He beams (order of 1013 ions per s) via the 9Be(n,α) reaction using spallation neutrons.
(Submitted to Nuclear Instruments and Methods in Physics Research B)
1) ISOLDE, CERN, 1211 Gen`eve 23, Switzerland
2) Department of Chemical Engineering, University of Edinburgh, Edinburgh EH9 3JL, Scotland 3) Institute of Spectroscopy, Russian Academy of Sciences, 142190 Troitsk Russia
4) Gesellschaft fu ̈r Schwerionenforschung, 64291 Darmstadt, Germany
5) Sektion Physik, Ludwig-Maximilians-Universita ̈t Mu ̈nchen, 85748 Garching, Bavaria
6) E ́cole Polytechnique F ́edˆerale de Lausanne, 1015 Lausanne, Switzerland
7) Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, 3001 Leuven, Belgium
CERN-EP/2002-097 14 November 2002
Image | OXIDE FIBER TARGETS AT ISOLDE
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