| 释义 |
Pomeranchuk Physics.|pɒməˈræntʃʊk|
[Name of Isaak Yakovlevich Pomeranchuk (1913–66), Russian physicist.]
a. Used attrib. with reference to the cooling that a mixture of liquid and solid helium 3 undergoes when it is solidified by compression. [Described by Pomeranchuk in Zh. éksper. i teoret. Fiziki (1950) XX. 919.]
1958Chem. Abstr. LII. 17841 (heading) Theory of the Pomeranchuk effect in helium-3. 1971McGraw-Hill Yearbk. Sci. & Technol. 86/2 First proposed in 1950, the Pomeranchuk method is based on the unusual thermodynamic properties of a solid-liquid mixture of He3 at low temperatures. 1974Nature 6 Dec. 441/3 Compressional solidification of 3He, known as Pomeranchuk cooling,..restricts experiments to the solidification pressure of 34 atmospheres. 1976Ibid. 23 Sept. 276/1 A pair of Pomeranchuk cells was used both for cooling the 3He into the superfluid A-phase and also for inducing a flow of liquid through the narrow tube which connected them together.
b. Used, chiefly attrib., to designate certain concepts relating to the scattering of sub-atomic particles at high energies, as Pomeranchuk pole, a special Regge pole with α(0) = 1 and even signature, and with zero isospin, charge, hypercharge, and baryon number (α being the trajectory function); Pomeranchuk('s) theorem, a theorem according to which the reaction cross-sections for a particle and for its anti-particle incident on the same target particle should approach the same constant value as the energy of the incident particle is increased; (proposed by Pomeranchuk in Zh. éksper. i teoret. Fiziki (1958) XXXIV. 725); Pomeranchuk trajectory, the trajectory traced by a Pomeranchuk pole as α increases.
1961Physical Rev. CXXIV. 2049/2 We shall present..a rigorous generalization of Pomeranchuk's theorem. 1962Nuovo Cimento XXV. 735 We are assuming either that the coupling constant of the ρ Regge pole is much smaller than that of the Pomeranchuk (vacuum) pole, or that their trajectories lie close together. 1963Physical Rev. CXXIX. 1456/1 Further insight into the behavior of two Pomeranchuk trajectories can be achieved by evaluating the two leading terms in the high-energy behavior of the total elastic cross section. 1973Physics Bull. Mar. 183/2 There is some doubt about the validity of the Pomeranchuk theorem on the constancy of cross sections for K+, K- production. 1973M. Leon Particle Physics xii. 244 Elastic scattering..is supposed to be dominated by the Pomeranchuk pole. 1976N. W. Dean Introd. Strong Interactions xvi. 303 If all total cross sections are to become asymptotically constant, the Pomeranchuk trajectory must be present in all elastic scattering amplitudes. Ibid., The f (1270) and the f′ (1514) mesons have the correct quantum numbers, but there is considerable question whether either of them actually belongs to the Pomeranchuk trajectory. |