helicityn.

/hiːˈlɪsɪti/

Etymology: < Latin helix, helic-em (see helix n.) + -ity suffix.

1. Physics. The projection of the spin angular momentum of an elementary particle on the direction of its linear momentum.

ΘΚΠ

the world > matter > physics > quantum theory > electron spin > [noun] > projection of spin angular momentum

helicity1958

1958 Physical Rev. 109 1017/1 Our result seems compatible with..100‰ negative helicity of the neutrinos emitted in orbital electron capture.

1968 M. 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.

1970 New 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. Biochemistry. Helical character.

ΚΠ

1965 Biochem. & Biophysical Res. Communications XIX. 231 We observe that the degree of helicity in native and denatured a lactalbumin are the same.

1970 Nature 25 July 336/2 The side chains in a series of water-soluble glutamine derivatives, the helicity of which can be controlled.

This entry has not yet been fully updated (first published 1976; most recently modified version published online September 2018).

单词	helicity
释义	helicityn. /hiːˈlɪsɪti/ Etymology: < Latin helix, helic-em (see helix n.) + -ity suffix. 1. Physics. The projection of the spin angular momentum of an elementary particle on the direction of its linear momentum. ΘΚΠ the world > matter > physics > quantum theory > electron spin > [noun] > projection of spin angular momentum helicity1958 1958 Physical Rev. 109 1017/1 Our result seems compatible with..100‰ negative helicity of the neutrinos emitted in orbital electron capture. 1968 M. 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. 1970 New 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. Biochemistry. Helical character. ΚΠ 1965 Biochem. & Biophysical Res. Communications XIX. 231 We observe that the degree of helicity in native and denatured a lactalbumin are the same. 1970 Nature 25 July 336/2 The side chains in a series of water-soluble glutamine derivatives, the helicity of which can be controlled. This entry has not yet been fully updated (first published 1976; most recently modified version published online September 2018). < n.1958
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