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| Dissertation / PhD Thesis | GSI-2019-00714 |
2010
Abstract: An important and growing sub-field of modern subatomic physics is the studyof exotic isotopes using radioactive beams. Experiments started out simple,but are becoming more and more advanced. The increased complexity makesthe use of software at all levels, from data acquisition to analysis, evermorepresent. However, it is rather the vast amounts of data collected in eachexperiment, than the sophistication of the calculations needed, that mandatesthe use of computers.This thesis describes methods to unpack and handle raw data acquired in nuclearphysics experiments, and discusses the importance of transparency inthe data formats to allow access to the information also after long times. Themajor part of the work has been performed at the ALADiN-LAND setup atGSI, in conjunction with experiments studying halo nuclei. Aspects of datacollection and issues related to network-based event-building are discussedand resolved. It outlines a possible mechanism extending the existing MBSdata acquisition system to allow injection of persistent slow-control information,stored along with the events. At the detector level, it discusses thecalibration and reconstruction of a device where the digitised signals needmultiple levels of transformations before the physical interactions are recovered.Moving outwards to the level of analysing data for the entire setup, anongoing work to develop an experiment-independent scheme for tracking ofparticles in a barely overdetermined setup is described.Experimental findings for the very exotic 9,10He and 12,13Li systems beyondthe dripline are shown, where 12,13Li have been observed for the first time inthis experiment. The intriguing results obtained earlier at the same facilityfor 7He showing initially a weakening of the spin-orbit splitting have beenreexamined using additional experimental information.
Note: Dissertation, Chalmers University of Technology, Göteborg (Sweden), 2010
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