Erlangen 2001 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 14: Instrumentation und Anwendungen I

HK 14.5: Vortrag

Dienstag, 20. März 2001, 15:45–16:00, A

Magnetic moment measurements with radioactive beams ⁺ — •O. Kenn¹, K.-H. Speidel¹, R. Ernst¹, J. Gerber², P. Maier-Komor³, N. Benczer-Koller⁴, G. Kumbartzki⁴, and F. Becker⁵ — ¹Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn, Germany — ²Institut de Recherches Subatomiques, F-67037 Strasbourg, France — ³Physik-Dept., TU München, D-85748 Garching, Germany — ⁴Dept. of Physics and Astronomy, Rutgers Univ., New Brunswick, NJ 08903, USA — ⁵CEA-Saclay, F-91191 Gif-sur-Yvette, France

Recent experiments have shown that the technique of Coulomb excitation of beam ions in inverse kinematics where the target nuclei are lighter than the beam particles, combined with transient magnetic fields, provides a powerful method to measure magnetic moments of short-lived states with high precision and efficiency [1]. The method is directly applicable to beams of radioactive nuclei. In contrast to stable beam ions where the beam is stopped in a stopper foil placed behind the target and in front of the particle detector, for radioactive beams the ions have to be stopped in a downstream beam dump to avoid an excessive accumulation of activity near the target. To achieve this goal a particle detector of annular type is proposed which allows to pass the beam through the centre hole of the detector. A test was carried out in these experimental conditions using ⁵⁰Ti beams with its known g factor of the 2₁⁺ state [2].
[1] R. Ernst et al., Phys. Rev. Lett. 84 (2000) 416
[2] O. Kenn et al., NIM B 171 (2000) 589
⁺ supported by DFG and BMBF