A Trilogy of Mass A=61 : Superdeformed Structures, Exotic Decay, and Isospin Symmetry

Research output: ThesisDoctoral Thesis (compilation)

Abstract

Three nuclei with mass number A=61 have been studied using four fusion-evaporation experiments carried out at the Oak Ridge, Argonne and Lawrence Berkeley National Laboratories.

Normally deformed states in 61Ga were for the first time ever explored and in addition the experimental knowledge of the mirror nucleus 61Zn was extended. The two nuclei together provide the possibility to explore mirror symmetries and isospin breaking effects in medium-heavy nuclei. Moreover an indication of a prompt proton decay was observed in 61Ga which adds further complexity to the isospin symmetry studies. The normally deformed structures in the two nuclei are compared to the predictions from spherical shell-model calculations using different nuclear interactions. The comparison indicates the importance of the included subshells in the interaction and also the influence of the number of active particles in the calculations.

High-spin states in 61Zn and 61Cu have been studied and the previously published level schemes have been greatly extended for both nuclei in the current analysis. In total thirteen rotational structures dominated by quadrupole transitions and five dominated by dipole transitions have been found in the two nuclei. Each structure is compared to predictions from cranked Nilsson-Strutinsky calculations and associated with certain predicted configurations. The general agreement with the predictions is good but the results may be further enhanced if modifying the standard Nilsson parameters. Suggestions on how to improve the agreement are given and first results are also indicated in the thesis.

Details

Authors
  • Lise-Lotte Andersson
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics

Keywords

  • fusion-evaporation reactions, cranked Nilsson-Strutinsky calculations, prompt particle decay, shell-model calculations, mirror nuclei, Fysicumarkivet A:000, high-spin states, Superdeformation
Original languageEnglish
QualificationDoctor
Awarding Institution
Supervisors/Assistant supervisor
Award date2008 Sep 26
Publisher
  • Lund University (Media-Tryck)
Print ISBNs978-91-628-7584-8
Publication statusPublished - 2008
Publication categoryResearch

Bibliographic note

Defence details Date: 2008-09-26 Time: 13:15 Place: Sal B, Fysiska Institutionen External reviewer(s) Name: Jungclaus, Andrea Title: Dr Affiliation: Instituto de Estructura de la Materia, Madrid, Spain ---

Related research output

Andersson, L-L., Ingemar Ragnarsson, Dirk Rudolph, Johansson, E. K., Torres, D. A., Andreoiu, C., Carpenter, M. P., Charity, R. J., Chiara, C. J., Ekman, J., Claes Fahlander, Hoel, C., Pechenaya, O. L., Reviol, W., du Rietz, R., Sarantites, D. G., Seweryniak, D., Sobotka, L. G. & Zhu, S., 2009, In : Physical Review C (Nuclear Physics). 79, 2, 024312.

Research output: Contribution to journalArticle

Andersson, L-L., Dirk Rudolph, Gillis Carlsson, Claes Fahlander, Johansson, E., Ingemar Ragnarsson & Torres, D., 2008, Nuclear Physics and Astrophysics. American Institute of Physics, Vol. 1072. p. 211-214

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Andersson, L-L., Rudolph, D., Johansson, E., Torres, D. A., Carlsson, G., Ragnarsson, I., Andreoiu, C., Baktash, C., Carpenter, M. P., Charity, R. J., Chiara, C. J., Ekman, J., Fahlander, C., Hoel, C., Pechenaya, O. L., Reviol, W., du Rietz, R., Sarantites, D. G., Seweryniak, D., Sobotka, L. G. & 2 othersYu, C. H. & Zhu, S., 2008, In : European Physical Journal A. Hadrons and Nuclei. 36, 3, p. 251-278

Research output: Contribution to journalArticle

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