At ISOLDE, CERN the development of charge breeding techniques is one of the key points for numerous future experiments. We report in this article on the latest online tests of the Daresbury Phoenix booster at ISOLDE. The performances of the continuous mode were investigated for different injected stable beams. Preliminary results were obtained with the afterglow pulsing method and two injected noble gas isotopes. These latter tests are of particular interest for the postacceleration of ISOL-type beams. FIG. 4. Scope signals of the O 7+ afterglow pulse for a 20 Hz squared TTL signal ͑left͒ and a 10 Hz 10% duty cycle ͑right, zoomed͒. For indication 1 V =10 A. 03B105-3 Phoenix booster tests at ISOLDE Rev. Sci. Instrum. 77, 03B105 ͑2006͒ This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitationnew.aip.org/termsconditions. Downloaded to IP: 202.28.191.34 On: Sun, 21 Dec 2014 01:09:15 03B105-5 Phoenix booster tests at ISOLDE Rev. Sci. Instrum. 77, 03B105 ͑2006͒

The onset of collective features is expected to occur in the high-spin structure of the light lead isotopes. We have searched for new features in lg4Pb using the '"Dy ("S, 4n) and the 15'Sm ("Ca, 4") reactions with projectiles from the Tandem accelerator at Daresbury Laboratory. The level scheme was extended to J D 34R, a much higher spin than has been observed in other investigations. The highest spin is observed in a band structure consisting of dipole transitions ending at a proposed isomeric state. We find indications of collective band structures among the high-spin states in the spin region J > 16 h. Cranked'shell model calculations were performed and the results of these are compared with shell model calculations.NUCLEAR REACTIONS 162Dy (36S, 4n), E = 155 MeV; lsoSm ('8Ca, 4"). E = 200 MeV; measured E.,, I.,, I ( c c , , ?(e), yy, y-multiplicity. lg4Pb deduced levels, decays, E,; J,r. Enriched targets, Ge, Si(Li) detectors, array of anti-Compton spectrometers, B G O ball.

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