| 释义 |
recoilless, a.|rɪˈkɔɪllɪs, ˈriː-|
Also recoil-less.
[f. recoil n. + -less.]
Having no recoil. a. Mil. Applied to a firearm in which recoil is reduced or eliminated by deflection of much of the combustion gas to the rear.
1948Jrnl. British Interplanetary Soc. July 163 There were two types [of rocket-firing guns] scheduled for development, one static.., the other a portable ‘recoilless’ model on a wheeled chassis. 1953Times 28 May 5/4 Both the United States and the French armies have produced admirable recoilless guns since 1946. 1957Economist 7 Sept. 855/1 Recoilless anti-tank rifles could knock out any tank built in the Soviet Union. 1972M. Kenyon Shooting of Dan McGrew i. 9 You'll be wanting a recoil-less rifle to defend your honour. 1975Times 10 Apr. 8/7 Mortar and recoilless rifle fire has been used against the international airport.
b. Nucl. Physics. Applied to transitions occurring in an atomic nucleus bound in a crystal lattice in which a photon is emitted from the nucleus without recoil (the Mössbauer effect: see Mössbauer).
1960Physical Rev. CXX. 1093/1 Mössbauer's observation rests on the fact that in the case of a nucleus bound in a crystal, a γ ray can be emitted or absorbed without any energy transfer to and from the lattice. The probability of such a recoilless transition is, in most cases, small. 1962[see recoil momentum s.v. recoil n. 5 b]. 1971Greenwood & Gibb Mössbauer Spectrosc. i. 11 Mössbauer experiments usually utilise the recoilless emission of γ-rays by a radioactive source followed by their subsequent resonant recoilless reabsorption by a non-active absorber. 1974Nature 19 Apr. 638/2 The 13·3-keV transition to the ground state has long been one of the most attractive candidates for high resolution experiments because..the low energy of the γ photon assures that a high probability of recoil-less transitions will result even at room temperature. |