A study of the inelastic scattering of neutrons with an energy of \(14.1\)~MeV on the nuclei of oxygen, phosphorus and sulfur was carried out at the TANGRA facility at JINR (Dubna). The purpose of ...the experiment was to refine existing and obtain new data on the yields and angular distributions of \(\gamma\)-quanta emitted by the studied nuclei as a result of neutron-induced nuclear reactions using the tagged neutron method. Two types of detector systems were used to register \(\gamma\)-quanta. The \(\gamma\)-ray yields were measured using a high-purity germanium (HPGe) detector. The angular distributions of \(\gamma\)-rays were obtained using a system of 18 scintillation detectors based on bismuth germanite Bi\(_{4}\)Ge\(_{3}\)O\(_{12}\) (BGO) located around the sample. As a result of the studies carried out, the yields of two transitions for the reaction of tagged neutrons with \(^{16}\)O, nine transitions for the reaction with \(^{31}\)P, and nine transitions for the reaction with \(^{32}\)S were measured for the first time. The angular anisotropy of the \(\gamma\)-radiation accompanying the inelastic scattering of neutrons with an energy of \(14.1\)~MeV on \(^{31}\)P nuclei was also measured for the first time.
Iron, iron carbide and iron oxide nano- and micro-particles were synthesized in a hermetically sealed container using ferrocene and a mixture of ferrocene, xylene and water. The particles produced ...possess well expressed magnetic properties and are wrapped in a protective carbon cover. Carbon provides excellent protection against moisture and chemical influences and insures a long-lasting stability. Structural changes in the particles and their covers were examined at up to 1000 °C in vacuum and 800 °C in air, as were their stability under the influence of acids. The particles morphology was examined by scanning (SEM) and transmission electron microscopy (TEM); their chemical composition and crystal structure were studied by X-ray diffraction (XRD), Mössbauer spectroscopy and electron probe X-ray micro analysis and energy dispersive X-ray spectrometry (EDS).
We show that the nanoresonator position can be squeezed significantly below the ground state level by measuring the nanoresonator with a quantum point contact or a single-electron transistor and ...applying a periodic voltage across the detector. The mechanism of squeezing is basically a generalization of quantum nondemolition measurement of an oscillator to the case of continuous measurement by a weakly coupled detector. The quantum feedback is necessary to prevent the "heating" due to measurement back-action. We also discuss a procedure of experimental verification of the squeezed state.
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