1,434 research outputs found
On the origin of the narrow peak and the isospin symmetry breaking of the (3872)
The (3872) formation and decay processes in the -decay are investigated
by a -two-meson hybrid model. The two-meson state consists of the
, , , and channels.
The energy-dependent decay widths of the and mesons are
introduced. The - interaction is taken to be consistent with a
lack of the bound state. The coupling between the
and or the and channels is obtained
from a quark model. The - coupling is taken as a
parameter to fit the (3872) mass. The spectrum is calculated up to 4 GeV.
It is found that very narrow and peaks appear
around the threshold. The size of the peak we
calculated is 1.29-2.38 times as large as that of the . The
isospin symmetry breaking in the present model comes from the mass difference
of the charged and neutral and mesons, which gives a sufficiently
large isospin mixing to explain the experiments. It is also found that values
of the ratios of the transfer strengths can give the information on the
(3872) mass or the size of the - coupling.Comment: 33 pages, 12 figure
Suppressing the effect of lithium dendritic growth by the addition of magnesium bis(trifluoromethanesulfonyl)amide
Practical applications of Li-S and Li-air batteries require the morphology of the Li metal negative electrode during charge/discharge (i.e., Li-deposition/dissolution) cycling to be precisely controlled. Herein, we used magnesium bis(trifluoromethanesulfonyl)amide [Mg(TFSA)(2)] as an electrolyte additive to suppress the growth of Li dendrites, utilizing the occurrence of an alloying reaction between the initially substrate-deposited Mg and the subsequently deposited Li. Notably, no metallic Mg formation and no change in Li deposition morphology were observed at an electrolyte composition of 0.1 M Mg(TFSA)(2) + 0.9 M LiTFSA/triglyme, irrespective of the applied potential. In contrast, increasing the Mg salt concentration to 0.5 M resulted in the deposition of interconnected granules, reflecting a dramatic morphology improvement. X-ray diffraction analysis revealed the occurrence of the abovementioned alloying, which finally afforded a deposit composition of Li0.9Mg0.1 via the formation of an intermediate Li0.14Mg0.86 phase. Importantly, the deposits obtained under various applied potentials were relatively smooth, with no needle-like morphology observed.ArticlePHYSICAL CHEMISTRY CHEMICAL PHYSICS.20(2):1127-1133(2018)journal articl
中性流体およびプラズマにおける亜臨界不安定性について
International audience亜臨界不安定性は,非線形不安定性の一種である.亜臨界不安定な系は,線形安定であっても非線形的に不安定となる.特徴として,不安定性が生じるための初期摂動の大きさに閾値が存在し,閾値以下の摂動は減衰し安定化する.亜臨界不安定性は,流体やプラズマにおいて広くみられる現象である.亜臨界不安定性は,乱流や構造形成,異常抵抗性や乱流輸送に本質的なインパクトを与えるため重要な問題である.この解説では,亜臨界不安定性の概念について解説し,様々な物理的局面における研究について紹介する
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