Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 12: Poster Session: Instrumentation and Applications
HK 12.6: Poster
Tuesday, March 9, 2004, 13:30–15:30, Foyer
FRS-Resolution and kinematical cuts. — •Orlin Yordanov1, Jose Benlliure2, Timo Enqvist3, Jorge Pereira2, and Karl-Heinz Schmidt1 — 1Gesellschaft für Schwerionenforschung mbH, Planckstr. 1, D-64291 Darmstadt, Germany — 2Dpto. de Fisica de Particulas, Universidad de Santiago de Compostela, E-15706 Santiago de Compostela, Spain — 3CUPP-Project, P.O.-Box 22, FIN-86801 Pyhäsalmi, Finland
The GSI Projectile Fragment Separator (FRS) as a high-resolution magnetic spectrometer is well suited for studies of fragmentation reactions using the inverse kinematics technique. The capability of the identification in atomic number, combined with the measurement of the time-of-flight and magnetic rigidity of the reaction products, enables studies on reaction kinematics and the precise measurements of production cross sections even of very short-living nuclei. It is shown that rather unique values for the mass resolution (A/ΔA≈500) and for the absolute precision of the velocity of the fragments in the projectile frame (0.01 cm/ns) have been reached at 1 A GeV. The acceptances of the spectrometer in angle and momentum are sufficient to fully cover the distributions of the heavier fragments. Full momentum distributions of lighter fragments can be established by combining the information measured with different settings of the magnetic fields, if appropriate corrections for the momentum dependence of the angular transmission are applied. These data on reaction kinematics give a new experimental access to the physics of nuclear matter under extreme conditions.