The transition between order and chaos is studied in the warm rotating nucleus 174W by γ-spectroscopy, focusing on the conservation of selection rules of the K quantum number with the excitation energy, where K is the projection of the total angular momentum on the symmetry axis. The 174W nucleus was populated by the fusion-evaporation reaction of 80Ti (at 217 MeV) on a 128Te backed target. The measurement was performed in July 2010 at Legnaro National Laboratories of INFN using the AGATA Demonstrator HPGe-array coupled to an array of 27 BaF 2 scintillators, named Helena. The data analysis concentrates on γ-γ coincidence matrices selecting the γ-decay flow populating low-K and high-K structures. By a statistical fluctuation analysis the total number of low-K and high-K bands can be evaluated as a function of excitation energy. Comparisons with cranked shell model calculations at finite temperature are used to extract information on the onset of the chaotic regime as a function of excitation energy.
Study of the order-to-chaos transition in 174W with the AGATA-demonstrator / V. Vandone, S. Leoni, D. Assanelli, S. Bottoni, A. Bracco, F. Camera, F.C.L. Crespi, A. Giaz, R. Nicolini, L. Pellegri, G. Benzoni, N. Blasi, C. Boiano, S. Brambilla, B. Million, O. Wieland, A. Corsi, D. Bortolato, E. Calore, A. Gottardo, D.R. Napoli, E. Sahin, J..J..V. Dobon, D. Bazzacco, M. Bellato, E. Farnea, S. Lunardi, D. Mengoni, C. Michelagnoli, D. Montanari, F. Recchia, C.A. Ur, A. Gadea, T. Hüyük, N. Cieplicka, A. Maj, M. Kmiecik, A. Atac, S. Akkoyun, A. Kaskas, J. Nyberg, P.A. Söderström - In: Journal of Physics: Conference Series Volume 366, Issue 1, 2012, Article number 012045 19th International School on Nuclear Physics, Neutron Physics and Applications, VARNA 2011; Varna; Bulgaria; 19 September 2011 through 25 September 2011 / [a cura di] C. Stoyanov , S. Dimitrova, V. Voronov. - [s.l] : IOP, 2012. - pp. 012045 (( convegno 19th International School on Nuclear Physics, Neutron Physics and Applications, VARNA 2011 tenutosi a Varna, nel 2011 [10.1088/1742-6596/366/1/012045].
Study of the order-to-chaos transition in 174W with the AGATA-demonstrator
V. Vandone
;S. Leoni;S. Bottoni;A. Bracco;F. Camera;F.C.L. Crespi;A. Giaz;R. Nicolini;L. Pellegri;A. Corsi;D. Montanari
;
2012
Abstract
The transition between order and chaos is studied in the warm rotating nucleus 174W by γ-spectroscopy, focusing on the conservation of selection rules of the K quantum number with the excitation energy, where K is the projection of the total angular momentum on the symmetry axis. The 174W nucleus was populated by the fusion-evaporation reaction of 80Ti (at 217 MeV) on a 128Te backed target. The measurement was performed in July 2010 at Legnaro National Laboratories of INFN using the AGATA Demonstrator HPGe-array coupled to an array of 27 BaF 2 scintillators, named Helena. The data analysis concentrates on γ-γ coincidence matrices selecting the γ-decay flow populating low-K and high-K structures. By a statistical fluctuation analysis the total number of low-K and high-K bands can be evaluated as a function of excitation energy. Comparisons with cranked shell model calculations at finite temperature are used to extract information on the onset of the chaotic regime as a function of excitation energy.
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