Morgan, Thomas James (2008): Identification of Nilsson Orbitals in the Superdeformed Minimum of 237Pu. Dissertation, LMU München: Faculty of Physics |
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Abstract
As the first case ever studied with high - resolution spectroscopy for odd-N nuclei in the second potential minimum, the fission isomers in 237Pu (t1/2 = 110ns/1.1 μs) were investigated using the 235U(alpha,2n) reaction with a pulsed alpha beam (Ealpha =24 MeV, Deltat=400 ns) from the Cologne Tandem accelerator. A metallic 235U target (3.7 mg/cm2)was used, where the 237Pu reaction products were stopped and fission products were emitted in opposite directions. The rare gamma-rays from the second potential well in delayed coincidence with fission products were measured with the MINIBALL spectrometer. The identified level scheme will be presented and compared to single - particle calculations allowing for the first time an identification of the Nilsson quantum numbers. The identification of Nilsson orbitals will provide an important input for the validation and improvement of theoretical nuclear models and will lead to improved predictions for fission barriers and their extrapolations to neutron-rich heavy elements in the mass region of the r-process path of the astrophysical nucleosynthesis.
Item Type: | Theses (Dissertation, LMU Munich) |
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Subjects: | 500 Natural sciences and mathematics > 530 Physics 500 Natural sciences and mathematics |
Faculties: | Faculty of Physics |
Language: | English |
Date of oral examination: | 27. May 2008 |
1. Referee: | Habs, Dietrich |
MD5 Checksum of the PDF-file: | 1abbee78f9111892134c3f50c344ff09 |
Signature of the printed copy: | 0001/UMC 17040 |
ID Code: | 8576 |
Deposited On: | 24. Jun 2008 06:07 |
Last Modified: | 24. Oct 2020 07:22 |