Study of the order-to-chaos transition in 174W with the AGATA-demonstrator
19th International School on Nuclear Physics, Neutron Physics and Applications, VARNA 2011, Varna, Bulgaristan, 19 - 25 Eylül 2011, cilt.366, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Cilt numarası: 366
- Doi Numarası: 10.1088/1742-6596/366/1/012045
- Basıldığı Şehir: Varna
- Basıldığı Ülke: Bulgaristan
- Ankara Üniversitesi Adresli: Evet
Özet
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.