| 释义 |
superˈheavy, a. (n.)
[super- 9 a.]
a. gen. Extremely heavy, heavier than the normal. Occas. as n.
1952Sci. Amer. May 44/1 It is a job for accurate balancing and gyroscope controls..and therefore an ideal spot for Hevimet, super-heavy Carboloy created-metal. 1974Physics Bull. Dec. 578/3 The quarks give way to..super⁓heavy mesonic matter and, ultimately, neutrons, protons and the lighter mesons. 1976Daily Times (Lagos) 22 Sept. 30/1 That's how wrestling ‘superheavy’ Ray Apallon begins the open challenge to ‘any of your Nigerian heavy⁓weight wrestlers’.
b. Nucl. Physics. Of, pertaining to, or designating an element with an atomic mass or atomic number greater than those of the naturally occurring elements; spec. having an atomic number of 110 or more and belonging to a group having a limited range of proton/neutron ratios which confer enhanced stability against radioactive decay. Also as n., such an element.
1955J. A. Wheeler in W. Pauli Niels Bohr 183 The superheavy nuclei that are neutron stable. 1962L. Deighton Ipcress File xviii. 107 Tritium is also called super-heavy hydrogen. 1970Physics Bull. Dec. 534/2 The success of this view..has led to the suggestion that there exists a further ‘island’ of stability around mass number 300: superheavy nuclei which may have lifetimes from a fraction of a second, up to many years. 1971New Scientist 18 Feb. 344/3 The radioactive counts from the mercury source showed the most promise for a superheavy. 1979Nature 16 Aug. 549/2 There is no convincing evidence that superheavy elements have been discovered. 1980Physical Rev. C. XXI. 1664/2 The recent theoretical estimates of low barriers..are supported by the failure to detect superheavies in the 48Ca + 248Cm reaction. |