ABSTRACT
The nuclear two-photon or double-gamma (2γ) decay is a second-order electromagnetic process whereby a nucleus in an excited state emits two gamma rays simultaneously. To be able to directly measure the 2γ decay rate in the low-energy regime below the electron-positron pair-creation threshold, we combined the isochronous mode of a storage ring with Schottky resonant cavities. The newly developed technique can be applied to isomers with excitation energies down to â¼100 keV and half-lives as short as â¼10 ms. The half-life for the 2γ decay of the first-excited 0^{+} state in bare ^{72}Ge ions was determined to be 23.9(6) ms, which strongly deviates from expectations.
ABSTRACT
An improved design of a longitudinally sensitive resonant Schottky cavity pickup for the heavy ion storage rings of the Facility for Antiproton and Ion Research in Europe (FAIR) project is reported. The new detector has a higher measured Q value of â¼3000 and a higher simulated shunt impedance of 473.3 kΩ. It is possible to vary the sensitivity of the cavity with a motorized mechanism by inserting a dissipative blade during the operation based on experimental needs. Apart from a lower price tag, the new design features a more robust and production-friendly mechanical structure suitable for a series production in the future FAIR project. The manufactured cavity was built temporarily into the experimental storage ring and had delivered its first results using stored heavy ion beams. The structure, simulation results, and performance of this cavity are presented in this work.
ABSTRACT
Inspected 112 patients, found out of intussusception of intestine (II) in 79 (70.5%) boys and 33 (29.5%) girls. Developed algorithm of complex pathogenetically grounded inspection, individual approach, on the stages of inspection and treatment for the improvement of diagnostics and treatment of children concerning II. Determination of nosotropic features of clinic of II for children, clinical and echographic signs, that enabled differentiation of the state of circulation of bowel wall, considerably extended possibilities of conservative treatment even at presence of clinical manifestations of II in terms over 18 24 hours. Expedient deep study of problems of purchased II diagnostics by pediatricians, family doctors.