Abstract
A pair of twin position-sensitive parallel plate avalanche counters have been developed at the Australian National University as a tracking system to aid in the further rejection of unwanted beam particles from a 6.5 T super conducting solenoid separator named SOLEROO. Their function is to track and identify each beam particle passing through the detectors on an event-by-event basis. In-beam studies have been completed and the detectors are in successful operation, demonstrating the tracking capability. A high efficiency 512-pixelwide-angle silicon detector array will then be integrated with the tracking system for nuclear reactions studies of radioactive ions.
Highlights
A pair of twin position-sensitive parallel plate avalanche counters have been developed at the Australian National University as a tracking system to aid in the further rejection of unwanted beam particles from a 6.5 T super conducting solenoid separator named SOLEROO
Each ion exiting the solenoid prior to reaching the secondary target will pass through the tracking detector, where it will be electronically identified on an event-by-event basis before hitting the secondary target
The electrons produced in the gas feel the positive bias from a central foil between the X and Y foils and the charge collected gives the energy lost by the ions passing through the Parallel Plate Avalanche Counters (PPACs)
Summary
Most of our current understanding in nuclear physics has come from using stable targets and beams. The ability to study unstable nuclei has opened up a vast new range of physics to be explored Whilst decay of these isotopes makes most of them unsuitable as targets, they can be used as beams, known as Radioactive (or Rare) Isotope Beams (RIB) [2]. The Australian National University (ANU) RIB capability, based on a super-conducting solenoidal separator, is currently being developed [3] This capability is successfully producing radioactive nuclei such as (6He, 8Li, 10Be, 12B) by transfer reactions, which are transmitted and focussed by the solenoid onto the secondary target position for nuclear reaction studies. Each ion exiting the solenoid prior to reaching the secondary target will pass through the tracking detector, where it will be electronically identified on an event-by-event basis before hitting the secondary target This information will allow reconstruction of ion trajec-.
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