Fragmentation and Multifragmentation of 10.6A GeV Gold Nuclei

We present the results of a study performed on the interactions of 10.6A GeV gold nuclei in nuclear emulsions. In a minimum bias sample of 1311 interac- tions, 5260 helium nuclei and 2622 heavy fragments were observed as Au projec- tile fragments. The experimental data are analyzed with particular emphasis of target separation interactions in emulsions and study of criticalexponents. Multiplicity distributions of the fast-moving projectile fragments are inves- tigated. Charged fragment moments, conditional moments as well as two and three -body asymmetries of the fast moving projectile particles are determined in terms of the total charge remaining bound in the multiply charged projectile fragments. Some differences in the average yields of helium nuclei and heavier fragments are observed, which may be attributed to a target effect. However, two and three-body asymmetries and conditional moments indicate that the breakup mechanism of the projectile seems to be independent of target mass. We looked for evidence of critical point observable in finite nuclei by study the resulting charged fragments distributions. We have obtained the values for the critical exponents gamma, beta and tau and compare our results with those at lower energy experiment (1.0A GeV data). The values suggest that a phase transition like behavior, is observed.Comment: latex, revtex, 28 pages, 12 figures, 3tables, submitted to Europysics Journal

Magnetic cage-like metallasilsesquioxanes

Magnetic Cage-like metallasilsesquioxanes (CLMSs) are made of paramagnetic transition metal ions (or lanthanides) assembled through silsesquioxane ligands to build molecular architectures of different structural organization. Numerous parameters govern the magnetic properties in such systems, which range from simple paramagnetic behaviour to slow relaxation of the magnetization. Here we present a short overview focusing on recent advances in this family of compounds giving an emphasis on their magnetic properties and trying to provide a property-structure relationship. (C) 2019 Elsevier B.V. All rights reserved

Distributions of Rapidity Intervals, Jet Ranges and Maximum Rapidity Gaps in Proton - Proton Interactions at 200-GeV/c

The semiinclusive reaction p+p {yields} n charged particles + anything was investigated with nuclear emulsions irradiated with 200 GeV/c protons at the NAL accelerator (Batavia, US). They measured angles {Theta} of all charged particles. In every event particles were ordered on rapidity which was approximated by the value y = -lntg {Theta}lab/2. In every event particles were numbered on increasing the rapidity. Let us consider, for example, distributions of ordered rapidities and distributions of differences of various ordered rapidities and try to make a physical conclusion from the analysis of these distributions

New Ni4Na2-phenylgermsesquioxane architecture: Synthesis, structure and slow dynamic behaviour

The first Ni(ii)-based metallagermaniumsesquioxane cage compound [(PhGeO1.5)10(NiO)4(NaO0.5)2] presents a sandwich-like structure where two germsesquioxane cages are linked through an {NiO}4 core and exhibits slow dynamics of the magnetization. © 2018 The Royal Society of Chemistry

Novel carbonate/pyridine tetranuclear nickel complex, exhibiting slow relaxation of the magnetization

Tetranuclear [Ni4(CO3)4(pyridine)8·Na]Cl·pyridine·H2O compound with unusual square-planar geometry was obtained via spontaneous fixation of atmospheric CO2 and its conversion into carbonate bridging ligands. This compound exhibits a slow relaxation of the magnetization caused by a spin-glass behaviour. © 2021 Elsevier B.V

New Ni4Na2-phenylgermsesquioxane architecture: Synthesis, structure and slow dynamic behaviour

The first Ni(ii)-based metallagermaniumsesquioxane cage compound [(PhGeO1.5)10(NiO)4(NaO0.5)2] presents a sandwich-like structure where two germsesquioxane cages are linked through an {NiO}4 core and exhibits slow dynamics of the magnetization. © 2018 The Royal Society of Chemistry

Unusual penta- and hexanuclear Ni(ii)-based silsesquioxane polynuclear complexes

Fine-tuning of the reaction between alkali metal siloxanolate [PhSi(O)ONa]n and [Ni(NH3)6]Cl2 allowed us to design new hexa- [(PhSiO1,5)12(NiO)6(H2O)(DMSO)9] (1) and pentanuclear [(PhSiO1,5)10(NiO)5(NaOH)(DMF)7] (2) cage-like silsesquioxanes. Their specific structures were studied by single crystal X-ray diffraction and topological analyses. Compound 2 is the first example of a pentanuclear "cylinder"-like metallasilsesquioxane. Magnetic property investigations demonstrate the presence of a slow relaxation of the magnetization, induced by spin glass-like behavior in both cases. © The Royal Society of Chemistry 2016

Unusual penta- and hexanuclear Ni(ii)-based silsesquioxane polynuclear complexes

Fine-tuning of the reaction between alkali metal siloxanolate [PhSi(O)ONa]n and [Ni(NH3)6]Cl2 allowed us to design new hexa- [(PhSiO1,5)12(NiO)6(H2O)(DMSO)9] (1) and pentanuclear [(PhSiO1,5)10(NiO)5(NaOH)(DMF)7] (2) cage-like silsesquioxanes. Their specific structures were studied by single crystal X-ray diffraction and topological analyses. Compound 2 is the first example of a pentanuclear "cylinder"-like metallasilsesquioxane. Magnetic property investigations demonstrate the presence of a slow relaxation of the magnetization, induced by spin glass-like behavior in both cases. © The Royal Society of Chemistry 2016

New Luminescent Tetranuclear Lanthanide-Based Silsesquioxane Cage-Like Architectures

The synthesis, structure, magnetic, and luminescence properties investigations of four new cage-like lanthanide-based silsesquioxanes (Cat)2[(PhSiO1.5)8(LnO1.5)4(O)(NO2.5)6(EtOH)2(MeCN)2] (where Cat+=Et4N+, PPh4P+ and Ln3+=Eu3+, Tb3+ and (Ph4P)4[(PhSiO1.5)8(TbO1.5)4(O)2(NO2.5)8]⋅10MeCN are reported. They present an unusual prism-like topology of cage architectures and lanthanide-characteristic emission, which makes them the first luminescent cage-like lanthanide silsesquioxanes. One of the Tb3+-based cages presents a magnetic spin-flip transition. © 2020 Wiley-VCH Gmb