A present mystery in nuclear physics is the location of mirror states in the nuclei $\sp9$B, $\sp9$Be, with much less known about $\sp9$B. A measurement of the location of the low lying states of $\sp9$B was made using the reaction $\rm\sp6 Li(\sp6 Li,\sp9 B)t$ at a bombarding energy of 56 MeV. These states have not been previously observed due to their expected large width and small populations which leave them masked by other strongly populated states in the same energy region. Resonant Particle Decay Spectroscopy was applied to the $\alpha{+}\alpha{+}\rm p$ particles resulting from the decay of $\sp9$B. With this technique, relative energy spectra could be constructed that had low background because states were removed which decay via other reaction channels. In addition, singles spectra for both $\sp9$B and $\sp9$Be were obtained to provide evidence for the population of the excited states in the mirror nuclei $\sp9$B and $\sp9$Be. The relative energy spectra of $\sp9$B were analyzed using the one-level R-matrix approximation, in which the reduced widths of the excited states were taken from $\sp9$Be data, and the excitation energies of the unknown states and the formation factors were used as adjustable parameters in this fit. The previously unresolved ${1\over 2}\sp+$ state of $\sp9$B was clearly found, and it lies at an excitation energy $\le$1.6 MeV. In addition, there was evidence that the location of the ${1\over 2}\sp-$ state, which must exist in $\sp9$B, lies between 2.0 and 2.5 MeV in excitation. / Source: Dissertation Abstracts International, Volume: 55-08, Section: B, page: 3379. / Major Professor: Kirby W. Kemper. / Thesis (Ph.D.)--The Florida State University, 1994.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_77225 |
| Contributors | Tiede, Mark Allen., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 119 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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