Letter | Published:

Fundamental State of Nuclear α-Particles

Nature volume 131, pages 618619 (29 April 1933) | Download Citation



IT is known that γ-rays accompanying α-disintegration are due to the fact that an α-particle can escape from the nucleus with energy less than corresponds to the fundamental level, leaving the resultant nucleus in an excited state1. The relative intensities of these ‘fine-structure’ groups are given by the transparency of the potential barrier for corresponding energies En): where j is the azimuthal quantum number of the escaping a -particle. These intensities must rapidly decrease with energy and will be still further reduced in cases when j is not zero in the excited states ; it can be calculated from (1) that this reduction will be respectively 1–3, 4, 16 and 105 times for j = l, 2, 3, 4. Thus we come to the conclusion that, in cases where, for normal decay, the a -particle has j = 0, the slow groups of fine-structure will be very weak.

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  1. 1.

    , NATURE, 126, 397, Sept. 13, 1930.

  2. 2.

    , NATURE, 129, 470, March 26, 1932.

  3. 3.

    , "Str. fine des rayons alpha". Paris, 1932.

  4. 4.

    , NATURE, 131, 433, March 25, 1933.

  5. 5.

    , NATURE, 131, 57, Jan. 14, 1933.

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  1. Physico-Mathematical Institute, Academy of Sciences of U.S.S.R., Leningrad. March 17.

    • G. GAMOW


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