Particle detection at REX-ISOLDE and the d(30Mg, 31Mg)p reaction

Abstract

Due to the production and acceleration method for radioactive ions at REX-ISOLDE, a newly commissioned accelerator, there are three sources for beam contamination: isobaric contamination from the ISOLDE target, isobaric contamination from β-decay while the ions are captured in the REXtrap and charge bred in the EBIS, and stable contamination from the residual gas in the EBIS if the mass to charge ratio allows it to pass the mass separator of REX. In order to determine the beam contamination qualitatively and quantitatively two 10 μm thick silicon pin-diodes were installed in the beamline behind the target chamber in September 2004. The results of measurements with exotic 30Mg and 32Mg beams are presented in the first part. In the second part a partial analysis of an experiment employing the(d, p) reaction in inverse kinematics with a 30Mg beam is presented. The aim of this experiment was to study the level scheme of 31Mg and to get additional information about the spin and parity of its states via the angular distribution of the protons emitted