Within a dynamical approach, the average spins of fission fragments originating from the 12C + 235,236U and 13C + 235U complete fusion reactions at c.m. energies in the range of Ec.m. = (55–75) MeV are analyzed as a function of energy. Particular attention is given to the process of formation of initial distributions for the components of the total angular momentum of compound nuclei. It is shown that substantial distinctions in the behavior of average spins of fission fragments for different fusion reaction channels are expected to be observed in the range of subbarrier energies.

The pharmacokinetics of the Astatine-211 radiopharmaceutical was investigated after a single injection in male SD (Sprague–Dawley) rats that had normal and iodine-free diets. Twelve groups of SD male rats were examined in the study. The tested drug was intravenously injected into the tail vein of the animals once at a volume of 10 mL/kg and dose of 100 μCi per animal. In the study, the animals were subjected to necropsy at specific time points with retrieval of the organs and tissues for further analysis of the activity of the samples using a well-type scintillation gamma spectrometer. It was found that the 211At absorption by the thyroid in the male rats that had an iodine-free diet was greater than in the rats that had a conventional diet.

A new approach to calculating the mean spins of induced-fission fragments is proposed. This approach, which has the key dynamic aspects of induced fission factored in, was used to analyze experimental data on the angular and energy dependences of mean spins and on the anisotropy of the angular distributions of fission fragments for the 16 O + 232 Th reaction at E cm = 80–150 MeV. The range of relaxation times that provide a consistent description of the experimental data was determined for the degree of freedom associated with the orientation of the symmetry axis of a fissioning nucleus with respect to the total angular momentum.

A way of calculating the average spins of induced fission fragments is developed, based on the dynamic model of their angular distributions. The range of relaxation times for the degree of freedom associated with the orientation of the axis of symmetry of a fissioning nucleus relative to its total angular momentum is determined by analyzing experimental data on the energy dependences of average spins and the anisotropy of the angular distributions of fission fragments for the 12C, 16O + 232Th reactions at E сm = 55–150 MeV.

1 Dipartimento di Fisica, Università “Federico II” di Napoli, Napoli, Italy. 2 INFN Sezione di Padova, Padova, Italy. 3 INFN, Laboratori Nazionali di Legnaro, Legnaro (Padova), Italy. 4 Nevsehir Haci Bektas Veli University, Science & Art Faculty, Physics Department, Nevsehir, Turkey. 5 National Research Center “Kurchatov Institute”, Moscow, Russia. 6 Dipartimento di Fisica e Astronomia dell’Università di Bologna and INFN, Bologna, Italy. 7 Dipartimento di Fisica e Astronomia dell’Università di Firenze and INFN, Firenze, Italy. 8 Skobeltsyn Institute of Nuclear Physics, Moscow state University, Moscow, Russia.

The possibility of a self consistent description of a large set of the experimental data concerning the induced fission reactions of heavy nuclei is demonstrated in terms of a theoretical approach to describing the decay of excited heavy nuclei that considers nuclear dissipation and the double-humped structure of the fission barrier. The experimental data on the probability of fission for a large set of nuclei, yields of shape isomers, total fission lifetime, and angular distributions of fission fragments for reactions induced by deuterons and α-particles are analyzed. Theoretical analysis yields new information on the parameters of double-humped fission barriers, magnitude of nuclear viscosity, and relaxation time for K -mode.

This work is a continuation of the development of Astatine-211, a new α-emitter radiopharmaceutical for treating cancer of the thyroid gland. The internal doses in a patient’s organs, e.g., the eye and the lens of the eye, are estimated using the GEANT-4 software for calculating absorbed doses in different organs with allowance for the complex anatomy of the human body. The results of calculations show that with the same therapeutic dose in an irradiated organ (the thyroid gland), the use of Astatine-211 radiopharmaceutical reduces the radiation dose of the eye by several orders of magnitude, compared to the use of pharmaceuticals containing 131I.

D. Fabris1, T. Marchi2, F. Gramegna2, M. Degerlier3, V. L. Kravchuk4, M. Cinausero2, S. Appannababu2, G. Baiocco5, L. Morelli5, G. Casini6, S. Barlini6, M. Bini6, S. Carboni6, N. Gelli6, A. Olmi6, G. Pasquali6, S. Piantelli6, G. Poggi6, S. Valdrè6, O. V. Fotina7, S. A. Goncharov7, D. O. Eremenko7, O. A. Yuminov7, Yu. L. Parfenova7, S. Yu. Platonov7, V. A. Drozdov7, A. Brondi8, R. Moro8, E. Vardaci8

A dynamic model of the mass-angular correlations of quasi-fission fragments was developed. The projection of the angular momentum onto the symmetry axis of the dinuclear system and its rotation angle are treated as dynamic variables in the model. The model was tested in the analysis of the experimental data for the 64Ni + 198Au reaction at E lab = 383 and 418 MeV. Information on lifetimes of the dinuclear system was obtained.

An approach was developed to describe the double-differential spectra of secondary particles formed in heavy-ion reactions. Griffin model of nonequilibrium processes was used to account for the nonequilibrium stage of the compound system formation. Simulation of de-excitation of the compound system was carried out using the Monte-Carlo method. Analysis of the probability of neutron, proton, and α-particle emission was performed both in equilibrium, and in the pre-equilibrium stages of the process. Fission and γ-ray emission were also considered after equilibration. The analysis of the experimental data on the double-differential cross sections of p, α particles for the 16O + 116Sn reaction at the oxygen energy E = 130 and 250 MeV were performed.

We propose to investigate the alpha-particle emission from hot Rb nucleus, formed in the reactions with alpha-cluster O projectile on Cu target and with non alpha-cluster F projectile on Ni target, using the GARFIELD and RCo detector arrays. The main goal of the proposal is to measure the pre-equilibrium alpha-particle emission for the two systems indicated above in order to extract information about the influence of alpha-clustering in the O projectile on productions alpha particles during the non-equilibrium stage of the nuclear reactions. Experimental study of the effect is a perspective way for investigation of alpha clusterization in exotic neutron rich nucleus. We propose to study two cases. In the first one the projectile energy per nucleon will be the same: 16 MeV/u for the O and F beams. In the second case the composite system formed in the same two reactions will have the same excitation energy of 209 MeV. The total request of beam time is 10 days (not including tuning of ALPI). 1 pnA pulsed beams with a resolution of 1 ns and a repetition time of 400 ns (or 800ns depending on the accelerator performances) is required. Targets, Cu and Ni, will be 0.5 mg/cm thick each.