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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Poster

HK 49.43: Poster

Donnerstag, 15. März 2007, 16:00–17:00, P

Isobar separation at FRS-ESR, a development study towards pure isomeric stored beams — •Christoph Scheidenberger^1,2, Karl Beckert¹, Peter Beller¹, Fritz Bosch¹, David Boutin², Lixin Chen², Bernhard Franzke¹, Hans Geissel^1,2, Ronja Knöbel¹, Christophor Kozhuharov¹, Sergei Litvinov¹, Yuri Litvinov¹, Gottfried Münzenberg¹, Fritz Nolden¹, Wolfgang Plaß², Markus Steck¹, Baohua Sun¹, Helmut Weick¹, and Martin Winkler¹ — ¹GSI, Planckstraße 1, D-64291 Darmstadt — ²II. Physikalisches Institut, Justus-Liebig-Universität, Heinrich-Buff-Ring 14-16,

It is one important goal of the ILIMA project at FAIR to study masses and decay properties of relativistic isomeric beams stored and cooled in the planned storage-ring complex. Coupled to the Super-FRS, which provides secondary beams of highest intensities, one expects to access the structure of exotic nuclei with new experimental opportunities (such as reactions with and scattering off internal targets) and also to discover new phenomena (such as neutron radioactivity from high-energy isomers in neutron-rich nuclei).

In favorable cases pure isomeric beams can be obtained. The present paper investigates possibilities, how such isomeric beams can be produced after projectile fragmentation and in-flight separation. First results from the spatial separation of crystalline secondary beams, delivered from the FRS and stored in the ESR, are shown, where a mass resolution of Δ m / m ≈ 2 · 10⁻⁵ is obtained.