Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 4: Instrumentation and Applications I

HK 4.1: Gruppenbericht

Montag, 8. März 2004, 15:45–16:15, C

Calorimeter Telescope for identification of relativistic HI reaction channels — •R. Lozeva^1,2, S. Mandal¹, and M. Gorska¹ — ¹GSI, Darmstadt, Germany — ²Faculty of Physics, University of Sofia "St. Kl. Ohridski", Sofia, Bulgaria

During a recent RISING [1] campaign at GSI, stable and radioactive heavy-ion beams at relativistic energies between 100 MeV/u and 200 MeV/u have been used to perform fragmentation and Coulomb excitation reactions on a secondary target. To distinguish the reaction channels, to obtain information about the impact parameter and to identify the outgoing projectiles, a newly developed CAlorimeter TElescope (CATE) [2] system has been employed. CATE consists of a position sensitive Si detector array with 9 elements for Z-identification and a corresponding CsI(Tl) detector array for A-identification. The detectors cover a large opening angle between 0^∘ and 3^∘.

The CATE system has been used for the detection of heavy ions from ⁵⁵Ni up to ¹³²Xe, with instantaneous rates of up to ∼5x10⁴ particles/s and ion energies in the range 90 MeV/u and 150 MeV/u. Under these conditions the detector system revealed an excellent Z resolution ΔZ∼1, a good position resolution (Δx,Δy)∼(5x5)mm and a mass resolution after several corrections corresponding to E_residual∼1% (FWHM).

[1] http://www-aix.gsi.de/^∼wolle/EB_at_GSI/rising.html

[2] http://www-linux.gsi.de/^∼lozeva/cate/cateweb.htm