Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Physik mit schweren Ionen

HK 20.3: Talk

Tuesday, March 11, 2008, 09:15–09:30, 2E

Spallation reactions of ²³⁸U and ⁵⁶Fe on deuterium, measured in inverse kinematics at the FRagment Separator at GSI — •M.Valentina Ricciardi and Strahinja Lukic for the CHARMS collaboration — GSI, Darmstadt, Germany

In 1996, at GSI, Darmstadt, a European collaboration started a long experimental program, devoted to reaching a full comprehension of spallation reactions. The experiments were performed in inverse kinematics, shooting nuclei with high kinetic energy on thin liquid ^1,2H targets. The nuclei escape the target strongly focussed in forward direction. Thanks to the high resolving power of the magnetic spectrometer (FRS) every nuclide can be unambiguously identified, its production cross section determined, and its velocity distribution measured with high precision. Five different nuclei (U, Pb, Au, Xe, Fe) impinging on two targets (hydrogen, deuterium) in the energy range 0.2-1.5A GeV were measured.

In this contribution, we will present the experimental data from two reactions recently analysed, ²³⁸U+²H at 1A GeV and ⁵⁶Fe+²H at 0.5A GeV, and compare them with ²³⁸U+¹H at 1A GeV and ⁵⁶Fe+¹H at 1A GeV. The experimental cases offer two different scenarios: one, where the target mass is doubled, the other where the target mass is doubled and at the same time the beam velocity is reduced to half the value. It will be discussed how the total energy introduced in the systems is a good ordering parameter for the study of the following deexcitation stage.