| 单词 |
helicity |
| 释义 |
helicity|hiːˈlɪsɪtɪ|
[f. L. helix, helic-em (see helix) + -ity.]
1. Physics. The projection of the spin angular momentum of an elementary particle on the direction of its linear momentum.
1958Physical Rev. CIX. 1017/1 Our result seems compatible with..100{pmil} negative helicity of the neutrinos emitted in orbital electron capture. 1968M. S. Livingston Particle Physics vii. 142 Helicity must be defined relative to a particular coordinate system. For example, if an electron is emitted from a beta decay process with velocity v = 0·95c and is observed in the laboratory to have left-handed helicity, its helicity would be reversed if viewed from a coordinate system moving parallel to the particle with velocity v = 0·99 c. 1970New Scientist 19 Mar. 545/2 A particle has helicity + 1 if it is seen as spinning counter-clockwise while approaching an observer, while if the observer sees the particle as spinning clock⁓wise, it has helicity -1.
2. Biochem. Helical character.
1965Biochem. & Biophys. Res. Communications XIX. 231 We observe that the degree of helicity in native and denatured a lactalbumin are the same. 1970Nature 25 July 336/2 The side chains in a series of water-soluble glutamine derivatives, the helicity of which can be controlled. |
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