Studies of neutron-rich nuclei close to magicity
This thesis deals with the experimental study of exotic neutron-rich nuclei. Three N~20 nuclei close to the so-called island of inversion have been studied via beta decay at the ISOLDE facility at CERN. The low energy level scheme of ³⁴Si (N=20) has been confirmed and the first level schemes for ³⁵Si (N=21) and ³³Mg (N=21) have been proposed. Single particle energies for ³⁵Si have been determined according to which the effective interaction in the sd-fp shell-model has been modified and comparison between theory and experiment is given for different neutron-rich isotopes. The ground state of ³³3Mg has been assigned as Jπ3/2⁺, manifesting the inversion of states in the island of inversion. In addition, superasymmetric fission yields have been obtained for 30 MeV proton induced fission of ²³⁸U at the IGISOL mass separator facility at the Accelerator Laboratory of the University of Jyväskylä. A velocity filter has been designed and built in connection with the IGISOL beam line in order t
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ISBN
978-951-39-9477-8ISSN Hae Julkaisufoorumista
0075-465XJulkaisuun sisältyy osajulkaisuja
- Artikkeli I: Hankonen, S., Dendooven, P., Huikari, J., Jokinen, A., Kolhinen, V., Lhersonneau, G., Nieminen, A., Peräjärvi, K., Rubchenya, V. A., Trzaska, W. H., Wang, J. C. and Äystö, J. (1999). Production of neutron-rich nuclei with A <80 in superasymmetric fission at IGISOL. Acta Physica Polonica B, 30, 677.
- Artikkeli II: Nummela, S., Baumann, P., Caurier, E., Dessagne, P., Jokinen, A., Knipper, A., Scornet, G. L., Miehé, C., Nowacki, F., Oinonen, M., Radivojevic, Z., Ramdhane, M., Walter, G., Äystö, J., & Collaboration, I. (2001). Spectroscopy of 34,35Si by beta decay : sd-fp shell gap and single-particle states. Physical Review C, 63(4), Article 044316. DOI: 10.1103/PhysRevC.63.044316
- Artikkeli III: Nummela, S., Nowacki, F., Baumann, P., Caurier, E., Cederkäll, J., Courtin, S., Dessagne, P., Jokinen, A., Knipper, A., Scornet, G. L., Lyapin, L. G., Miehé, C., Oinonen, M., Poirier, E., Radivojevic, Z., Ramdhane, M., Trzaska, W., Walter, G., Äystö, J., & Collaboration, I. (2001). Intruder features in the island of inversion : The 33Mg case. Physical Review C, 64(5), Article 054313. DOI: 10.1103/PhysRevC.64.054313
- Artikkeli IV: Nummela, S., Heikkinen, P., Dendooven, P., Nieminen, A., Huikari, J., Rinta-Antila, S., Jokinen, A., Äystö, J., & Rubchenya, V. (2002). Wien filter for cooled low-energy radioactive ion beams. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 481(1–3), 718-730. DOI: 10.1016/s0168-9002(01)01362-6
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