Electron Microscopic Observation of Au–Cu Alloy Particles Produced by Coalescence between Au and Cu Smoke Particles

Abstract

It has been proposed that the discrepancy between the partially conserved axialcurrent prediction and the nuclear shell-model calculations of the ratio C P /C A in the muon-capture reactions can be solved in the case of 28 Si by introducing effective transition operators. Recently there has been experimental interest in also measuring the required angular correlations in 20 Ne. Inspired by this, we have performed a shell-model analysis employing effective transition operators in the shell-model formalism for the transition 20 Ne(0 + g.s. ) + µ − → 20 F(1 + ; 1.057 MeV) + ν µ . Comparison of the calculated capture rates with existing data supports the use of effective transition operators. Based on our calculations, as soon as the experimental anisotropy data becomes available, the limits for the ratio C P /C A can be extracted.

Demonstration of crystalline forsterite grain formation due to coalescence growth of Mg and SiO smoke particles

“…In the present case, Mg smoke was obtained without direct heating of boat B. The temperature distributions were measured with a chromel-alumel thermocouple 20 µm in diameter, as reported in a paper on CdS smoke (Kaito, Fujita, and Shiojiri 1976) and other smoke experiments (Kaito 1981;Kaito 1984;Kaito and Fujita 1986). Results similar to those indicated in Fig.…”

“…Coalescence growth is regarded as an important process in the gas evaporation method. Evidence for and the mechanism involved in the coalescence growth of resulting smoke grains have been elucidated in a series of experiments (Kaito 1981, Kaito 1984, Kaito 1978, Kaito 1985. The coalescence process takes place during a short period of time (10 −3~1 0 −2 s), and a smoke mixture of two different metallic elements and compounds can form grains of alloy or compound oxides under appropriate conditions.…”

“…The coalescence phenomenon seen predominately in smoke experiments can be applied as a new grain formation method. Alloy or compound particles are directly synthesized by mixing smoke of different compositions within 10 −3~1 0 −2 seconds at a temperature range between 200~500°C (Kaito 1981(Kaito , 1984Kaito and Saito 1991;Nagata et al 1991). In a previous paper, we reported that films condensed from vapor phases of SiO and Mg or SiO and Fe by co-evaporation from different evaporation sources were not mixed at room temperature (Suzuki et al 2000).…”

Crystalline Mg$\mathsf{_{2}}$SiO$\mathsf{_{4}}$ and amorphous Mg-bearing silicate grain formation by coalescence and growth

“…• C (Kaito & Shiojiri 1982;Kaito 1984;Kaito & Fujita 1986). The cooling rate of the smoke is of the order of 10 −3 -10 −4 K/s.…”