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Experimental investigation of alpha-gas states using high-multiplicity particle spectroscopy

Bishop, Jack Edward (2018)
Ph.D. thesis, University of Birmingham.

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Abstract

The onset of a new state of matter in the nucleus, whereby the system can be described as a dilute gas of alpha-particles, represents a fantastic probe of the nuclear force. The observables from such an alpha-gas state are discussed here in tandem with a discussion of traditional alpha-cluster structure. An experiment, utilising a high energy compound nucleus reaction to study the \(^1\)\(^2\)C(\(^1\)\(^6\)0,7-alpha) reaction was performed at LNS Catania to search for the signatures of such a state of matter. Direct evidence of near-threshold alpha-gas states was found to be impeded by the effect of the Coulomb barrier. The break-up of the system into alpha-particles was seen to exceed the predictions from a statistical decay model of the compound nucleus which was performed. These results were instead compared with the Fermi break-up model which showed a greater agreement with the data but the limitations of the model meant an exact agreement was not achieved. No evidence of alpha-condensation was found in this experiment however an improved experiment where the effect of the Coulomb barrier is no longer important is presented as a future probe of this structure.

Type of Work:Ph.D. thesis.
Supervisor(s):Freer, Martin and Kokalova, Tzany
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Subjects:QC Physics
Institution:University of Birmingham
ID Code:8347
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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