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Beta Decay Studies of Neutron-Rich ³⁰,³¹Al and in-Beam Studies of Neutron-Rich ³⁰Al

Title: Beta Decay Studies of Neutron-Rich ³⁰,³¹Al and in-Beam Studies of Neutron-Rich ³⁰Al.
Name(s): Hinners, Trisha, 1979-, author
Tabor, Samuel L., professor directing dissertation
Aldrovandi, Ettore, outside committee member
Blessing, Susan, committee member
Riley, Mark, committee member
Piekarewicz, Jorge, committee member
Department of Physics, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2008
Publisher: Florida State University
Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Low-spin states were studied in 30Al following the β decay of 30Mg produced in the fragmentation of 140 MeV/AMU 48Ca. Analysis of the β-γ and β-γ-γ coincidences revealed a new 1+ state at 2413 keV, confirmation of the level scheme, and a more accurate half life measurement of 315(6)ms for the 30Mg ground state. Higher-spin states were investigated in the reaction of 14C on 18O at 22 MeV. Protons and deuterons were detected in a segmented E-Δ E Si telescope in coincidence with one or two gamma rays in the FSU Ge detector array. A comparison of the resulting level and decay scheme with predictions of the sd shell model shows good agreement with all but 6 of the states in both excitation energy and γ decay branching ratios. The RMS deviations in energy of these states using the older USD and newer USDA and USDB interactions were 265, 176, and 173 keV respectively. The remaining 6 states are well described as 4-to 7- states, similar in relative energy to those in 28Al but shifted down by about 1200 keV. These states also agree well with the predictions of shell model calculations using the WBP interaction. A comparison of the lowest 4- states in even A Na, Al, and P isotopes shows a systematic decrease in energy with increasing N and with decreasing Z. The energies of the 4- states are almost identical in nuclei with the same N - Z values. In addition to the study of 30Al, 31Al was also produced following the β decay of 31Mg in the fragmentation of 140 MeV/AMU 48Ca. The β-γ and β-γ-γ coincidences were able to show all previously known work. However, no new transitions were observed.
Identifier: FSU_migr_etd-4033 (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: Spring Semester, 2008.
Date of Defense: March 6, 2008.
Keywords: Negative Parity States, USDA/USDB, Nuclear Structure
Bibliography Note: Includes bibliographical references.
Advisory Committee: Samuel L. Tabor, Professor Directing Dissertation; Ettore Aldrovandi, Outside Committee Member; Susan Blessing, Committee Member; Mark Riley, Committee Member; Jorge Piekarewicz, Committee Member.
Subject(s): Physics
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Host Institution: FSU

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Hinners, T. (2008). Beta Decay Studies of Neutron-Rich ³⁰,³¹Al and in-Beam Studies of Neutron-Rich ³⁰Al. Retrieved from