The Study of 175Hf Decay

Abstract

The intensities of lines of the internal conversion electron and-rays emitted at the decay of 175 Hf nucleus (1/2 = 70 days) have been measured with the help of a √ 2 magneticspectrometer and two coaxial HPGe-detectors. On the basis of those data, the-ray branching ratios and the log values for-transitions are calculated. The limits on the log values for-transitions to 175 Lu levels 9/2 + at 113.8 keV, 9/2 − at 396.3 keV, and 9/2 + at 546.6 keV have been found for the first time.

Experimental fine-advancement of vacuum brazing processes for fabrication of S-Band RF coupling cells

“…It can be seen that the temperature of the brazing zone increased during the holding time, and the temperature of the chamber decreased. This is explained by the fact that at the beginning of the brazing process, the heater power was reduced, as a result of which the temperature of the chamber gradually decreased, and since in a vacuum the heating occurs only by temperature irradiation of the outer surface of the part and heating along with the wall thickness due to thermal conductivity (due to the absence of air, convective heat exchange does not occur) [4], the temperature of the brazing zone grew inertially.…”

“…The basics of brazing metal materials are given in [4], and the brands of used vacuum fillers based on silver-copper alloys are given in [5].…”

Some technological features for fabrication of accelerating structures

“…During diffusion, welding the joint is formed as a result of closing up of contact surfaces at the expense of local plastic deformations at elevated temperatures. During brazing the formation of joints is realized by heating the connected materials below their melting temperature, their wetting by solder, by solder wicking into the gap and its crystallization [5]. What concerns the heating type, which is used for connecting accelerating structures, the induction heating has advantages here as compared with radiation heating.…”