Observation Of New Resonances Research Articles

Recent Studies of Exotic Hadrons at the LHCb Experiment

Recent results on studies of exotic hadrons at the LHCb experiment are summarised. These are the observation of new resonances decaying to J/\psi K^+J/ψK+ and J/\psi\phiJ/ψϕ, evidence of a J/\psi\LambdaJ/ψΛ structure and observation of excited \Xi^-Ξ− states in the \Xi_b^-\to J/\psi\Lambda K^-Ξb−→J/ψΛK− decay and the study of B_s^0\to J/\psi\pi^+\pi^-K^+K^-Bs0→J/ψπ+π−K+K− decays.

10.1007/s11496-008-2002-5

This survey is devoted to the investigation of fission probability by measuring photofission yields using a bremsstrahlung spectrum of the microtron with the relative measurement method in the region of energies from the threshold to the upper boundary of the fissility plateau (E < 11 MeV). The results were obtained using a unique technique for nineteen nuclei from 232Th to 249Cf. For some nuclei in the threshold energy region, detailed measurements were performed which provided the possibility of observation of new resonances in the photofission cross section. The observed resonance effects are discussed. For 234U and 238, 240, 242Pu, theoretical analysis was performed to obtain the fission barrier parameters for fission channels with particular quantum states. Data of other measurements of photofission cross sections are given, along with the results obtained in the surveyed series of measurements. The data obtained using the relative measurement method is compared with data for other reactions that result in fission of the nuclei under study.

Relative measurements of photofission cross sections with the use of a bremsstrahlung spectrum

This survey is devoted to the investigation of fission probability by measuring photofission yields using a bremsstrahlung spectrum of the microtron with the relative measurement method in the region of energies from the threshold to the upper boundary of the fissility plateau (E < 11 MeV). The results were obtained using a unique technique for nineteen nuclei from 232Th to 249Cf. For some nuclei in the threshold energy region, detailed measurements were performed which provided the possibility of observation of new resonances in the photofission cross section. The observed resonance effects are discussed. For 234U and 238, 240, 242Pu, theoretical analysis was performed to obtain the fission barrier parameters for fission channels with particular quantum states. Data of other measurements of photofission cross sections are given, along with the results obtained in the surveyed series of measurements. The data obtained using the relative measurement method is compared with data for other reactions that result in fission of the nuclei under study.

Experimental investigation of Cherenkov flux-flow oscillators

This paper is devoted to the experimental investigation of a new class of superconducting microwave oscillators based on Cherenkov radiation from Josephson vortices. Samples consisting of a long Josephson junction embedded in a dispersive transmission line with space-periodical inhomogeneities were fabricated and tested. We report observation of new resonances on the I-V curve of the system and present the first radiation measurements in the 80-120 GHz frequency range.

Spin-flip Raman scattering from donor-bound electrons inCd1−xMnxTe/Cd1−yMgyTe single quantum wells

We report on the spin-flip Raman scattering of electrons bound to shallow donors in single quantum wells of ${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Mn}}_{\mathrm{x}}$Te between ${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathrm{y}}$${\mathrm{Mg}}_{\mathrm{y}}$Te barriers. An enhancement of the scattering intensity of the bound magnetic polaron was found for narrow quantum wells. A variational treatment of the quantum well exciton in combination with the polaron model developed for bulk material is applied to interpret the experimental observations. The reduced symmetry of the quantum well states manifests itself through the observation of new resonances in the Raman scattering cross section. A simple model taking into account the anisotropy of the Zeeman effect of the valence band can reproduce the observations.

A new type of resonances in saturated absorption spectroscopy of 3-level systems

We report the experimental observation of new resonances in saturated absorption spectra of a J = 1 to J = 0 transition of Ne atoms in a static magnetic field. These resonances, which are distinct from the well-known Zeeman and cross-over resonances, result from the modification of stimulated Raman processes by the simultaneous resonant saturation of an optical transition. The light-shifts of the various resonances are also studied.

Nonlinear excitation by modulation of new ion resonances in bounded magnetized plasmas

The microwave field creating a resonantly sustained bounded plasma is amplitude modulated at a lower frequency. Nonlinear interaction leads to the observation of new resonances in the magneto-ion domain. This constitutes a new method of coupling energy to the ions.