Nuclear orbiting and anomalies in nuclear reactions

In this paper, we report our measurements of back-angle oxygen and carbon particle yields from ¹⁶O+⁸⁹Y, ¹²C+⁹³Nb reactions forming the same compound nucleus ¹⁰⁵Ag at the same excitation energy and spin distribution. We find anomalously large oxygen yield and entrance channel dependence at high excitation energies from ¹⁶O+⁸⁹Y reaction implying formation of a dinuclear orbiting complex. Possible connection between nuclear orbiting and fast fission is also discussed.     

Soft X-ray resonant magnetic diffraction

We have conducted the first soft x-ray diffraction experiments from a bulk single crystal, studying the bilayer manganite La2-2xSr1+2xMn2O7 with x=0.475 in which we were able to access the (002) Bragg reflection using soft x rays. The Bragg reflection displays a strong resonant enhancement at the L(III) and L(II) manganese absorption edges. We demonstrate that the resonant enhancement of the magnetic diffraction of the (001) is extremely large, indeed so large that it exceeds that of the nonresonant Bragg diffraction. Resonant soft x-ray scattering of 3d transition metal oxides is the only technique for the atomic selective measurement of spin, charge, and orbital correlations in materials, such as high temperature superconductors, colossal magnetoresistance manganites, and charge stripe nickelates.     

Micro chemical investigation of medicinal plants. I

Summary Screening of over 50 medicinal plants has been carried out withM. tuberculosis 607 as the test organism, and thein vitro antitubercular activity of two Chinese traditional drugs-Prunus mume andSchizandra chinensis-has been established. Using bioassay to follow microchemical separation and purification processes, which include solvent extraction, chromatography and ion-exchange, the antitubercular activity has been traced to the fruity part of the berries and related to the presence of citric and malic acids.A simple method is described for the microdetermination of nonvolatile organic acids in plant extracts. It involves paper chromatography of the unknown solution together with solutions of known acids on the same sheet. The paper is then sprayed on both sides with methyl red. The chromatograms are cut out and affixed to a glass slide. The latter is placed in a specially constructed metal block fitted into the Beckman-DU spectrophotometer. The maximum optical densities of the respective red spots are measured at 580 nm. There is a linear relationship between concentration and optical density of each acid. High contents of citric acid and malic acid respectively, have been found in both plant drugs mentioned above.

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Zusammenfassung Über 50 Pflanzendrogen wurden mitM. tuberculosis 607 als Testsubstrat geprüft und dabei in vitro die antituberkuläre Wirkung zweier chinesischer Drogen —Prunus mume undSchizandra chinensis — festgestellt. Durch biologische Kontrolle konnte mittels mikrochemischer Trennung und Reinigung (Lösungsmittelextraktion, Chromatographie und Ionenaustausch) die antituberkuläre Aktivität im Fruchtteil der Beeren lokalisiert und auf die Anwesenheit von Zitronensäure und Äpfelsäure zurückgeführt werden. Eine einfache Mikrobestimmung nichtflüchtiger organischer Säuren in Pflanzenextrakten wurde beschrieben. Sie beruht auf Papierchromatographie der zu prüfenden Lösung gleichzeitig mit Lösungen bekannter Säuren auf demselben Papier. Dieses wird dann mit Methylrot besprüht. Die Chromatogramme werden ausgeschnitten und auf eine Glasscheibe fixiert. Diese wird in einen speziellen, in ein Beckman-DU-Spektrophotometer eingepaßten Metallblock gelegt und die optische Dichte der einzelnen roten Flecken bei 580 nm gemessen. Für jede Säure besteht Linearität zwischen Konzentration und optischer Dichte. Hoher Gehalt an Zitronensäure und Äpfelsäure wurden bei beiden Drogen gefunden.

     

Neutron–proton analyzing power at 12 MeV and inconsistencies in parametrizations of nucleon–nucleon data

We present the most accurate and complete data set for the analyzing power Ay(θ)$A_y(\theta )$ in neutron–proton scattering. The experimental data were corrected for the effects of multiple scattering, both in the center detector and in the neutron detectors. The final data at En=12.0 MeV$E_n=12.0\text{MeV}$ deviate considerably from the predictions of nucleon–nucleon phase-shift analyses and potential models. The impact of the new data on the value of the charged pion–nucleon coupling constant is discussed in a model study.     

Comparison of Various K̄N Partial Wave Analyses in the Region 0–1400 MeV/c

A comprehensive comparative study of the available K̄N partial wave analyses is made with a view to bring out their similarities and disagreements and to point towards those momentum regions that require particular attention in all future analyses. The multichannel nature of the K̄N scattering is discussed along with the presently available scattering cross-section data for various channels. The parametrization of the various partial wave analyses is discussed and their amplitudes calculated and compared under the set of conventions proposed by Levi Setti.