Effect of a magnetic field on the I – V characteristics of a germanium-electrolyte interface

A study has been made of the effect of the magnetic field on the I–V dependences (the so-called polarization curves) of an (n-Ge)-electrolyte interface and on the Ge electrode potential during anodic polarization. It is shown that the magnetic field shifts the saturation current toward lower currents and sharply increases the Ge surface potential in the current region. This is due to the effect of the magnetic field on the polarization current in the sample, which is governed by the diffusive flux of minority carriers. The shift of the breakdown region toward higher potentials in a magnetic field is evidence of impact-ionization multiplication of minority current carriers in the field of the Ge surface barrier.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, Vol.12, No. 3, pp. 99–103, March, 1969.The authors thank A. A. Lebedev for interest in the study and comments.     

Synthesis and some properties of pyrimidinylalkylphosphonic acids

Conclusions A study was made of the reaction of 6-methyluracil, uracil, and 2-amino-4-hydroxy-6-methylpyrimidine with chloromethylphosphonic acid. The structures of some of the products that were formed here were established.Translated from Izvestiya Akademii NaukSSSR, Seriya Khimicheskaya, No. 10, pp. 2254–2263, October, 1970.     

Improvement of sample preparation in the chemical sampling of gold ore deposits

A procedure used in the chemical sampling of gold ore deposits for assessing the representative mass of samples and analytical weighed portions is improved. It is shown that the coefficient K used to assess the representative sample mass and characterizing the nonuniformity of the gold distribution in the gold ore sample can go beyond the limits established by the regulations of the Ministry of Natural Resources of the Russian Federation.     

Two-coordinate position-sensitive monitor-detector of thermal neutrons

Development of new high-flux-intensity neutron sources and the need to equip them with efficient spectrometers raises the problem of designing special-purpose direct-beam monitors-detectors. These detectors feature an extremely low efficiency and a very low attenuation of the incident neutron beam. In this work, a two-coordinate position-sensitive monitor-detector is described that was developed for real-time recording of the profile of neutron beams generated by both steady and pulsed neutron sources. The basic parameters of this device are the following: a coordinate resolution of 4 × 4 mm², a sensitive area of 100 × 100 mm², and a recording efficiency of 10^?6?10^?2. Use of nitrogen as a converter makes it possible to achieve a record low efficiency and still maintain other parameters at a desired level. The device can be combined not only with high-flux-intensity neutron sources already in use worldwide but also with next-generation sources being developed in the United States (SNS) and Japan (JPARC).     

Magnetic Kicker for Beam Injection into the Nuclotron of the Nica Accelerator Complex

Physics of Particles and Nuclei Letters - This article presents the general layout, requirements for main elements, design of main elements, overall design, and calculation of the magnetic fields...