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GRE阅读综合辅导:63题新东方网络课堂总结(二十九)
http://www.21tx.com 2008年09月28日

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e universe.
提出探测的问题:要找一个方法满足研究中微子的两个前提But how can scientists detect a particle that interacts so infrequently with other matter? Twenty-five years(证明非常难以探测) passed between Pauli’s hypothesis that the neutrino existed and its actual detection: since then virtually all research with neutrinos has been with neutrinos created artificially*9C(人工产生,cosmic是宇宙中来的,两者非常不同) in large particle accelerators and studied under neutrino microscopes. But(转折之后更重要,探测的对象不同,之前是人工产生的粒子,之后是宇宙中来的粒子) a neutrino telescope, capable of detecting cosmic neutrinos, is difficult to construct. 第一个条件No apparatus can detect neutrinos unless it is extremely massive(提出条件:仪器特别巨大), BECause(原因,可暂时不看) GREat mass is synonymous with huge numbers of nucleons (neutrons and protons), and the more massive the detector, the greater the probability of one of its nucleon’s reacting with a neutrino. 第二个条件In addition, the apparatus must be sufficiently shielded from the interfering effects of other particles.

问题解决了Fortunately,

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