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Sobiczewski A.,Andrzej Soltan Institute for Nuclear Studies
Acta Physica Polonica B | Year: 2010

Predictions for the decay chains of the nuclei 293117 and 294117 are done within a macroscopic-microscopic model. The nuclei are planned to be synthesized in the reaction 249Bk + 48Ca (4n and 3n channels), to be performed in Dubna. It is obtained in our study that at least three α decays in both 293117 and 294117 chains should be observed. Thus, at least six new superheavy nuclides and one new superheavy element should be seen, if cross-sections for the reactions are sufficiently large. Additionally, it is expected that the decay chain of 294117 would be the first one in which the isotope of the element 113, 286113, has a chance to be studied chemically. Source

MacKintosh R.S.,Open University Milton Keynes | Keeley N.,Andrzej Soltan Institute for Nuclear Studies
Physical Review C - Nuclear Physics | Year: 2010

We present dynamic polarization potentials (DPPs), due to both neutron and neutron-pair pickup coupled reaction channels, contributing to the proton-nucleus interaction for the case of He8 at 15.66, 25, and 61.3 MeV/nucleon. The available elastic scattering and transfer data were fitted in coupled reaction channels calculations that allowed full interpartition couplings. In addition, the contributions with various different combinations of coupled reaction channels were considered; we show that this can throw light on the nonlocality of the underlying DPP, for which we determine the local and L-independent equivalent. © 2010 The American Physical Society. Source

Smolanczuk R.,Andrzej Soltan Institute for Nuclear Studies
Physical Review C - Nuclear Physics | Year: 2010

Chances of synthesis of transactinide nuclei in cold fusion reactions (one-neutron-out reactions) using radioactive beams are evaluated. Because in most of the cases intensities of radioactive beams are significantly less than those of the stable beams, reactions with the greatest radioactive-beam intensities for the particular elements are considered. The results are compared with the recent ones obtained by Loveland [Phys. Rev. CPRVCAN0556-281310.1103/ PhysRevC.76.014612 76, 014612 (2007)], who investigated the same nuclei. © 2010 The American Physical Society. Source

Sobiczewski A.,Andrzej Soltan Institute for Nuclear Studies
Radiochimica Acta | Year: 2011

A short review of the studies of superheavy nuclei (SHN), done recently in our theoretical group of Warsaw, is presented. Main attention is given to description of the properties of SHN. The description is performed by macroscopic-microscopic methods. Such properties as mass, α-decay energy and α-decay half-life are considered. Special attention is devoted to the analysis of the half-life. Although mainly treated in a phenomenological way, the role of the microscopic structure of a nucleus in this quantity is tested. It is found that this structure may significantly change the half-life of nuclei with the odd nucleon (or nucleons). © by Oldenbourg Wissenschaftsverlag, München. Source

Moszynski M.,Andrzej Soltan Institute for Nuclear Studies
Radiation Measurements | Year: 2010

According to the present knowledge, the non-proportionality of the light yield of scintillators appears to be the fundamental limitation of energy resolution and it is related to the intrinsic properties of the crystals. However, several observations collected in the last 10 years suggest more complex processes in the scintillators. First, the study of undoped NaI and CsI crystals showed that the non-proportionality and energy resolution are very sensitive to the accidental traces of impurities. For some crystals, like CsI(Tl), ZnSe(Te), undoped NaI at liquid nitrogen temperature and finally for NaI(Tl) at temperatures reduced below 0 °C, an influence of slow components of the light pulses on energy resolution and non-proportionality is observed. A common conclusion of these observations is the fact that the highest energy resolution, and particularly the intrinsic resolution measured with scintillators, characterized by two components of the light pulse decay, is obtainable when the spectrometry equipment integrates the whole light of both components. In the limiting case, the afterglow could be considered also as a very slow component destroying the energy resolution. The aim of this work is to summarize all above observations looking for their origin. © 2009 Elsevier Ltd. All rights reserved. Source

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