A Spectroscopic Investigation of Excited States of the Nucleus 73Br

Author

Brigid Esposito, DePaul UniversityFollow

Date of Award

Spring 6-14-2013

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics

First Advisor

Susan Fischer, Ph.D.

Abstract

Gamma rays emitted in the de-excitation of the nucleus ⁷³Br were created in two distinct experiments. Using Gammasphere and Microball, the first experiment selected nuclei created in the reaction for an incident ⁴⁰Ca beam and a ⁴⁰Ca target that were coincident with the creation of 1 a particle, 3 protons, and 4 gamma rays. These results were analyzed using a gating procedure that allowed for the validation of published level schemes and the identification of new rotational bands in the level scheme. Using Gammasphere, the Fragment Mass Analyzer, an ionization chamber, and neutron detectors, the second experiment selected nuclei created in the reaction of ³⁶Ar with ⁴⁰Ca that produced nuclei with Z = 35, A = 73, and no neutrons created. From this second set of data, Direct Correlations from Oriented Nuclei (DCO) Ratios were measured to identify the electromagnetic nature (E1, M1, E2) of the transitions between energy levels, both to verify spin states from published level schemes and to assign spins to newly observed states. This analysis revealed 5 new bands in the ⁷³Br level scheme and determined, or restricted, the total angular momentum of 16 states. Finally, moment of inertia calculations revealed a correlation between positive parity in a band and larger nuclear deformation.

Recommended Citation

Esposito, Brigid, "A Spectroscopic Investigation of Excited States of the Nucleus 73Br" (2013). College of Science and Health Theses and Dissertations. 51.
https://via.library.depaul.edu/csh_etd/51