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单词 Negative beta decay
释义

Negative beta decay

中文百科

Β衰变 Beta decay

(重定向自Negative beta decay)
Beta-minus (β-) 衰变。

贝他衰变beta decay,即β衰变)是放射性原子核放射电子(β粒子)和中微子而转变为另一种核的过程。

1896年,亨利·贝克勒(A. H. Becquerel)发现铀的放射性;1897年,卢瑟福(E. Rutherford)和约瑟夫·汤姆孙(J. J. Thomson)通过在磁场中研究铀的放射线偏转,发现铀的放射线有带正电,带负电和不带电三种,分别被称为α射线,β射线和γ射线,相应的发出β射线衰变过程也就被命名为β衰变。

1957年,美籍华裔物理学家吴健雄用钴-60的β衰变实验证明了在弱相互作用中的宇称不守恒。

英语百科

Beta decay Β衰变

(重定向自Negative beta decay)
β− decay in an atomic nucleus (the accompanying antineutrino is omitted). The inset shows beta decay of a free neutron. In both processes, the intermediate emission of a virtual W− boson (which then decays to electron and antineutrino) is not shown.
The Feynman diagram for β− decay of a neutron into a proton, electron, and electron antineutrino via an intermediate W− boson.
A beta spectrum, showing a typical division of energy between electron and antineutrino

In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which a proton is transformed into a neutron, or vice versa, inside an atomic nucleus. This process allows the atom to move closer to the optimal ratio of protons and neutrons. As a result of this transformation, the nucleus emits a detectable beta particle, which is an electron or positron.

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