# 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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## Abstract

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.
Supervisor(s):
Supervisor(s)EmailORCID
Freer, MartinUNSPECIFIEDUNSPECIFIED
Licence:
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
URI: http://etheses.bham.ac.uk/id/eprint/4688

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