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Emergence of Long-Range Angular Correlations in Low-Multiplicity Proton-Proton Collisions.
Phys Rev Lett
April 2024
INFN, Sezione di Pavia, Pavia, Italy.
Article Synopsis
- - This Letter discusses the measurement of ridge yields from charged hadron angular correlations in proton-proton collisions at a high energy of 13 TeV, specifically within certain pseudorapidity and transverse momentum ranges.
- - The research extends ridge yield measurements to low charged-particle multiplicity regions, where typically a strong interacting medium is not expected to form during collisions.
- - Findings indicate that ridge yields in pp collisions are significantly higher than those observed in e^{+}e^{-} collisions, suggesting that processes in e^{+}e^{-} annihilations do not significantly influence long-range correlations in proton-proton interactions.
Octahedral Zirconium Salan Catalysts for Olefin Polymerization: Substituent and Solvent Effects on Structure and Dynamics.
Inorg Chem
October 2023
Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Via dell'Elce di sotto 8, 06123 Perugia, Italy.
Group 4 metal-Salan olefin polymerization catalysts typically have relatively low activity, being slowed down by a pre-equilibrium favoring a non-polymerization active resting state identified as a isomer (MM); formation of the polymerization active species (FF) requires isomerization. We now show that the chemistry is more subtle than previously realized. Salan variations bearing large, flat substituents can achieve very high activity, and we ascribe this to the stabilization of the FF isomer, which becomes in energy than MM.
View Article and Find Full Text PDFPreequilibrium models for Ni (n, xp) and Ni (n, xp) reactions in neutrons at 8, 9, 9.4, 11 and 14.8 MeV using the EMPIRE and TALYS codes.
Appl Radiat Isot
March 2023
University of Sciences and Technology Houari Boumediene, Faculty of Physics, BP 32 El Alia, 16111, Bab Ezzouar, Algiers, Algeria.
In this study, the calculations of proton emission spectra produced by Ni (n, xp) and Ni (n, xp) reactions are used in the framework of preequilibrium models with the EMPIRE and TALYS codes. Exciton Model predictions combined with the Kalbach angular distributions systematics, quantum-mechanical preequilibrium models (Multi-step Direct (MSD) theory and Multi-step Compound (MSC) processes) were used, and some necessary parameters have been investigated for our calculations. The comparison with experimental data shows clear improvement over the Exciton and quantum-mechanical preequilibrium models calculations.
View Article and Find Full Text PDFFrozen in time: analyzing molecular dynamics with time-resolved cryo-EM.
Structure
January 2023
IMP - Research Institute of Molecular Pathology, Campus-Vienna-Biocenter 1, 1030 Vienna, Austria; Institute for Physical Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg, Germany. Electronic address:
Molecular machines, such as polymerases, ribosomes, or proteasomes, fulfill complex tasks requiring the thermal energy of their environment. They achieve this by restricting random motion along a path of possible conformational changes. These changes are often directed through engagement with different cofactors, which can best be compared to a Brownian ratchet.
View Article and Find Full Text PDFTheoretical Study on Abstraction and Addition Reaction Kinetics for a Medium-Size Unsaturated Methyl Ester: Methyl-3-hexenoate + H/OH Radicals.
J Phys Chem A
December 2022
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu610031, P. R. China.
Combustion chemistry of methyl esters with long alkyl chains and different degrees of unsaturation has been of particular interest for biodiesel combustion. Methyl-3-hexenoate (mhx3d) with a medium-size unsaturated aliphatic chain is regarded as a valuable surrogate of biodiesel components. Here, the abstraction and addition reaction kinetics of mhx3d + H/OH radicals are comprehensively investigated.
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