Many-particle rapidity correlations in light-ion interactions at the CERN intersecting storage rings

Many-particle rapidity correlations have been studied for αα,dd, andpp interactions at the CERN Intersecting Storage Rings using the Split-Field Magnet detector, and basing the investigating on the distributions of rapidity gaps between particles. In the framework of a simple cluster model, it is found that all the data samples have similar features and that the events contain clusters of two different types.     

High energy proton emission in reactions induced by 315 MeV 16O ions

Inclusive proton spectra have been measured for the reaction ¹⁹⁷Au(¹⁶O, p)X at 315 MeV. The data, which are consistent with emission from a moving source, are compared with the fireball model and with models preequilibrium emission.     

The radicals Ph4 Ás and Me4Śn-

ESR spectra obtained from γ-irradiated tetraphenylarsonium salts and tetramethylstannane are shown to be in agreement with expectation for the electron-excess centres Ph₄ās and Me₄?n^?.     

The formation of (CH3)3Ċ, H2ĊC(Me)2OH and ĊH3 radicals in the radiolysis of aqueous t-butyl alcohol: on the solvation of t-butyl alcohol by water

Exposure of aqueous glassy solutions of t-butyl alcohol to ⁶⁰Co γ-rays at 77°K gave ESR spectra characteristic of Me₃Ċ, and H₂ĊC(Me)₂OH radicals. The results for the former were unusual in that, for very dilute aqueous solutions and for solutions of 0.4 mole fraction through to the pure alcohol, all the Me₃Ċ radicals were apparently freely rotating, whilst for solutions in the mole fraction region 0.05 to 0.4, some or all of these radicals were stationary. Implications with respect to water structural factors are discussed.     

Zur Unterscheidung der verschiedenen St?rkearten

Ohne Zusammenfassung     

Die Unterscheidung des Reismehles von Buchweizenmehl

Ohne Zusammenfassung     

Zur ann?hernden Bestimmung von Harzim Ceresin

Ohne Zusammenfassung     

Quadrupole Moments of Na Isotopes

The electric quadrupole coupling constants eqQ/h of ²⁰Na (I ^π = 2⁺, T _1/2 = 449.7 ms), ²¹Na (I ^π = 3/2, T _1/2 = 22.49 s) and ²⁵Na (I ^π = 5/2, T _1/2 = 59.6 s) in single crystal ZnO and TiO₂ were precisely measured by applying the β-NMR technique. The ratio of the quadrupole moments between ²⁰Na (²⁵Na) and ²¹Na was determined to be 0.728 ± 0.023 (0.011 ± 0.002).     

ESR spectroscopy applied to the study of radiation mechanisms

ESR spectroscopy is a powerful tool for detecting radicals or radical-ions trapped in solids, and in many cases “primary” electron-gain and-loss centres can be identified and their structures elucidated. Sometimes these primary centres are trapped in pairs, separated byca. 5 to 15 Å giving triplet state ESR spectra. The significance of pair-trapping in relation to current theories for the action of ionizing radiation will be discussed with reference to several recent examples. Generally, the primary centres are well separated and ESR does not give useful information about spurs or local regions of high radical densities. Reasons for trapping will be summarized with specific reference to DNA and proteins. The question of electron-return will be discussed, and several examples of this will be reported.