In this dissertation, proton, two proton, and emission from the 14O + a
interactions were studied with the modified thick target inverse kinematics approach.
The radioactive beam was obtained by using resonances in the 14N(p, n)14O reaction.
The 14O was > 99% pure. By using a beam analysis system, the contaminant-tobeam
ratio was suppressed further to the 10−4 level. This makes the 14O beam at
TAMU one of the best available.
For the 14O(a, 2p) interaction, it was found that the resonance excited states
in 18Ne are populated, and most of them decay sequentially to the ground state of
16O, i.e. 18Ne* ! 17F* + p ! 16O + p + p. Two proton events corresponding to the
excited state of 18Ne*(8.45MeV), were found to have strong 2p correlation, which is
the fingerprint of 2He-decay. Several models were used to explain this decay process,
and evidence suggests that this state decays by 2He-emission.
By measuring the Time-Of-Flight for protons through the thick target, the location
of 14O(, p) reactions occurring at different places in the helium gas target were
identified. With this information, we were able to measure a spectrum of protons
corresponding to the population of 17F particle stable states in the 14O(a, p)17F reaction.
This method provides a new way to measure astrophysically important reactions
which involve radioactive nuclei and a particles.
By analyzing elastic scattering of 14O and 14C on 4He, a-cluster states in 18Ne* and 18O* were found. Some a-cluster states in 18Ne* were found for the first time.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-1357 |
| Date | 15 May 2009 |
| Creators | Fu, Changbo |
| Contributors | Tribble, Robert E. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation, text |
| Format | electronic, application/pdf, born digital |
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