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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Physik mit schweren Ionen
HK 26.3: Vortrag
Mittwoch, 14. März 2007, 11:45–12:00, F
Kinematical properties of fragmentation residues — •Antoine Bacquias — GSI, Darmstadt, Germany
The width of momentum distributions of fragmentation residues is important for the design of hybrid reactors ADS and for radioactive beam production. Predictions commonly used for the features of longitudinal momentum distributions are Morrissey systematic and Goldhaber model. Morrissey formula is only valid for small mass losses and does not fit the data over the whole mass range. Goldhaber model relies on a physical description which is not complete. We propose a model which is based on abrasion as described by Goldhaber, but also includes other features of the reaction (evaporation of nucleons and light fragments, multifragmentation). It contains a more complete physical ground and gives satisfactory predictions over the whole mass range covered by observed fragments.
Using FRS, a high resolution magnetic spectrometer, fragments from heavy ions collisions are fully identified, both in mass and nuclear charge. Furthermore, longitudinal velocities are measured with a relative precision around 5 · 10−4. We will compare our model with these data, from light fragments to the projectile.