Download Advances in Gamma Ray Resonant Scattering and Absorption: by Andrey V. Davydov PDF

By Andrey V. Davydov

This e-book provides the fundamentals and complicated issues of analysis of gamma ray physics. It describes measuring of Fermi surfaces with gamma resonance spectroscopy and the speculation of angular distributions of resonantly scattered gamma rays. The dependence of excited-nuclei usual lifetime at the form of the exciting-radiation spectrum and electron binding energies within the spectra of scattered gamma rays is defined. Resonant excitation by way of gamma rays of nuclear isomeric states with lengthy lifetime results in the emission and absorption traces. within the publication, a brand new gamma spectroscopic approach, gravitational gamma spectrometry, is built. It has a solution hundred million instances larger than the standard Mössbauer spectrometer. one other very important subject of this booklet is resonant scattering of annihilation quanta by way of nuclei with excited states in reference to positron annihilation. the applying of the tools defined is to provide an explanation for the phenomenon of Coulomb fragmentation of gamma-source molecules and resonant scattering of annihilation quanta to check the form of Fermi surfaces of metals.

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The position of the scatterer in the narrow part of the container permitted minimizing th e contribution of gamma-ray scattering by liquid nitrogen. 1 mm thick in the form of a disk 1 cm in diameter irradiated with thermal reactor neutrons at a flux density of about 2 × 1013 cm2 s–1 for about 100 h. The source was clutched between aluminum plates and fastened to a Plexiglas holder, which was rigidly connected to a moving coil of an electromagnetic vibrator. The lower ends of the aluminum plates were immersed in liquid nitrogen filling the Styrofoam cuvette.

The results of the measurements are shown in Fig. 5. 1 keV Gamma Rays… 41 Fig. 1 keV gamma line. It was obtained by means of the channel-by-channel subtraction of the number of counts in the mode where the vibrator was switched on from the number of counts in the mode where the vibrator was switched off Fig. 1 keV gamma rays resonantly scattered by 182W nuclei. The solid curve represents the theoretical unperturbedangular distribution matched with experimental data by determining a single parameter (ordinate scale) via a least squares fit 42 2 Experimental Study of Resonant Gamma-Ray Scattering parameter to be determined.

This special feature of Mössbauer scattering is directly related to the fact that, owing to the absence of recoil, the nucleus that absorbed a primary photon remains at its site of the crystal lattice throughout its lifetime in the excited state. At the same time, a nucleus that experienced recoil in the case of “classic” resonant gamma-ray scattering and which moves in the substance of the scatterer undergoes collisions with its atoms, with the result that the quantum numbers of the excited state change.

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