Study of excited states in \(^1\)\(^4\)C via the \(^4\)He(\(^1\)\(^0\)Be\(\alpha\))\(^1\)\(^0\)Be resonance scattering reaction

Malcolm, Jonathan (2013). Study of excited states in \(^1\)\(^4\)C via the \(^4\)He(\(^1\)\(^0\)Be\(\alpha\))\(^1\)\(^0\)Be resonance scattering reaction. University of Birmingham. Ph.D.

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A study has been made of the \(^4\)He(\(^1\)\(^0\)Be\(\alpha\))\(^1\)\(^0\)Be resonant scattering reaction to explore possible molecular rotation bands in \(^1\)\(^4\)C. The experiment was performed at a range of beam energies from 25 to 42 MeV. The recoil particles from the reaction were detected by a set of surface barrier zero degree monitors and two 'lampshade' arrays of silicon strip detectors. A range of new resonances were discovered in the excitation function of \(^1\)\(^4\)C between 13 and 24 MeV. Properties of some of these states were identified using angular distribution methods and monte carlo simulations. An R-matrix analysis was performed on the excitation function to provide additional information about the resonances. Three states, at excitation energies of E\(_x\) = 18.8, 19.76 and 20.66 MeV, have been measured and their spins and parities positively determined by angular correlation to be 5\(^-\), 5\(^-\) and 6\(^+\) respectively. Two additional states at energies E\(_x\) = 17.5 and 17.98 MeV have had their spins and parities identified by R-matrix analysis to be 3\(^-\) and 4\(^+\) respectively.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
College/Faculty: Colleges (2008 onwards) > College of Engineering & Physical Sciences
School or Department: School of Physics and Astronomy
Funders: Science and Technology Facilities Council
Subjects: Q Science > Q Science (General)
Q Science > QC Physics


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