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Digitale Medien

Inclusive excitation-energy distributions of hot nuclei from 44 MeV/nucleon Ar- and 32 MeV/nucleon Kr-induced reactions (1993)

Lott, B. ; Charvet, J. L. ; Crema, E. ; [weitere]

Springer

The European physical journal 346 (1993), S. 201-208

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ISSN: 1434-601X

Schlagwort(e): 25.70.Gh ; 25.70.Lm

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Inclusive neutron multiplicity distributions were measured by means of 4π liquid-scintillator detectors for Ar and Kr-induced reactions at 44 MeV/nucleon and 32 MeV/nucleon, respectively. For all the systems studied, the observed distributions exhibit a bump structure at large multiplicity, corresponding to highly dissipative collisions. For Ar-induced reactions, the excitation energies necessary to explain the most probable neutron multiplicity associated with these dissipative collisions are estimated, the correspondence between excitation energy and neutron multiplicity being calculated in the framework of the statistical model. The so-obtained values of excitation energies, which are systematically lower than those predicted using the massive-transfer picture, are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01306080

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Digitale Medien

Electronegativity scheme for reactions involving radical addition to vinyl monomers (1992)

Sokolov, A. V.

Springer

Russian chemical bulletin 41 (1992), S. 1750-1755

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ISSN: 1573-9171

Schlagwort(e): vinyl monomers ; radical addition ; reactivity ; correlation schemes

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract The concept of the apparent electronegativity of a reaction site has been introduced. This has been used to develop a new scheme for calculating the relative rate constants of addition of radicals with different structures to vinyl monomers. The parameters of the scheme are given for 40 reagents. The results of a comparison of calculated and literature rate constants of addition are presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00863803

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Transition states in the reaction of radical addition to the vinyl double bond (1993)

Sokolov, A. V.

Springer

Russian chemical bulletin 42 (1993), S. 640-644

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ISSN: 1573-9171

Schlagwort(e): vinyl monomers ; radical addition ; MO calculations ; transition states of reaction

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract The transition states for the addition of.CH3, CH3O.,.CCl3,.CF3, and HOO. radicals to the Cβ and Cα atoms of ethylene, propylene, styrerie, acrylonitrile, methyl acrylate, vinyl acetate, and vinyl- and vinylidene chlorides were calculated using the MNDO method. A satisfactory correlation between the heats of reaction and activation energies was found. The calculated coefficients of proportionality, 0.4–0.5, are twice as high as those in the Polyani—Semenov equation. The calculated heat of reaction of radical addition was shown to be as «strong» an index of reactivity as the calculated activation barrier.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00703996

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