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Clustering Phenomena in the a = 10 T = 1 Isobaric Multiplet

Title: Clustering Phenomena in the a = 10 T = 1 Isobaric Multiplet.
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Name(s): Kuchera, Anthony N., author
Rogachev, Grigory, professor directing dissertation
Tabor, Samuel, professor directing dissertation
Aldrovandi, Ettore, university representative
Prosper, Harrison, committee member
Volya, Alexander, committee member
Department of Physics, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2013
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Clustering of α particles plays an important role in light atomic nuclei. For example, multicenter structures built on the well-known low-lying states of 8Be can be formed. The addition of nucleons to the system may result in covalent-like bonding between the two α-cores. These structures have been called ''nuclear molecules" because of their analog to atomic molecules. Investigation of these exotic nuclear structures is the main subject of this experimental work. Much of the experimental and theoretical work for molecular-like states has been done within the Be isotopes, however, despite of significant effort, our knowledge and understanding of molecular-like structures is still deficient. This is due to limited experimental information on the states of interest. The main goal of this work is to provide this information for the unbound T=1 states in A=10 systems and look for signatures of the exotic α:2N:α configurations. The T=1 states in 10B between Ex = 8.7- 12.1 MeV were studied using the 1H(9Be,α)6Li*(T=1, 0+, 3.56 MeV) reaction. An R-matrix analysis was used to extract parameters for the five resonances observed. The widths of the known 2+ resonance at 8.9 MeV have been measured and support the theoretical predictions that it is a highly clustered state and can be identified as a member of the α-np-α rotational band. The 4+ member was not observed in this reaction channel. In a second experiment, 6He+4He elastic scattering was used to probe resonances in 10Be in search of α-2n-α structures. Using the active target detector system, ANASEN, the excitation function was measured from Ex = 9.6 - 15.4 MeV. This was the first experiment in which the new active target detector, ANASEN, was used in filled (active target) mode. The excitation function shows a strong resonance at 10.2 MeV which was identified as 4+ and assigned to the extremely stretched α:2n:α configuration. A broad structure centered at 13.5 MeV was also observed and it may possibly be the 6+ member of this rotational band.
Identifier: FSU_migr_etd-8585 (IID)
Submitted Note: A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Fall Semester, 2013.
Date of Defense: November 6, 2013.
Bibliography Note: Includes bibliographical references.
Advisory Committee: Grigory Rogachev, Professor Directing Dissertation; Samuel Tabor, Professor Directing Dissertation; Ettore Aldrovandi, University Representative; Harrison Prosper, Committee Member; Alexander Volya, Committee Member.
Subject(s): Physics
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8585
Owner Institution: FSU

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Kuchera, A. N. (2013). Clustering Phenomena in the a = 10 T = 1 Isobaric Multiplet. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-8585