Dynamical and statistical fragment emission properties in 200AMeV20Ne+40Ar collisions

Dynamical and statistical fragment emission processes in 200 A-bar MeV 20Ne+40Ar collisions are well probed by measurements of charge (Z), mass (A) and momentum vector (p->) of all fragments in large parts of the available momentum space. We present such data obtained at the cluster-jet target of the CELSIUS storage ring, for the first time with an internal, ultra-high vacuum (UHV) compatible detector system (CHICSi). Energy and angular dependence in Z and A distributions are not reproduced by a single-step model, e.g., those based on molecular dynamics (MD), but require a complete three-step model. We use here the intranuclear cascade+statistical multifragmentation+secondary evaporation model (CFEM). The angular dependence of isobaric ratios, like 6He/6Li at low emission velocities and temperatures extracted from isotopic (double) ratios, do exhibit differences, even from this model. These differences, which call for adjustment of model parameters, are discussed