Search academic texts

Information × Registration Number 0219U001282, 0118U002254 , R & D reports Title REACTIONS OF TWO-NEUTRON TRANSMISSION AND SCALE OF QUANTUM CHAOS OF NUCLEAR SPECTRA popup.stage_title Head Levon Alexandr, Registration Date 23-01-2019 Organization Sceintific Center "Inststute for nuclear reaseach National Academy of sciences Ukraine popup.description2 The excited states of the deformed 158Gd nuclear were studied in the reaction (p, t) with the help of the Munich Tandem and Q3D spectrograph. 30 new excited 0+ states (three orientation) corresponded to an excitation energy of up to 4.3 MeV. The total number of 34 excited 0+ states (four of which, conditionally) in a deformed nucleus is close to a complete level scheme, opens up a new opportunity for testing nuclear models and obtaining additional information on the structure of these special states. Statistical analysis of the distribution of collective states in actinide and rare earth nuclei is carried out in terms of nearest-neighbor spacing distribution intervals between levels. For the analysis, some approximations were applied, such as the linear approach to the repulsion levels density and Brody's proposed approach to these distributions. An intermediate nature of the experimental spectra of these states between order and chaos for a number of rare-earth nuclei and actinides is found. They are closer to the Wigner distribution for energies bounded by 3 MeV and to the Poisson distribution for data that includes higher excitation energies and higher spins. These features are confirmed by cumulative distributions, where the contribution of Wigner distributions dominates at smaller distances, while the Poisson distributions are more important at greater distances. An intermediate structure was found between the statistical features of Poisson and Wigner in experimental spectra by evaluating their individual contributions. NNSD for a smaller region of excitation energy may be better described by Wigner distribution. Product Description popup.authors Войтер Анатолій Петрович Горпинич Ольга Костянтинівна ГПоворозник Орест Михайлович Доронін Михайло Іванович Кісурін Костянтин Костянтинович Карлишев Юрій Якович Ковальов Олександр Миколайович Магнер Олександр Григорович Мазний Іван Олександрович Радіонов Сергій Вікторович Рознюк Юрій Сергійович Соколов Олександр Михайлович Шевчук Анатолій Антонович, popup.nrat_date 2020-04-02 Close