Nuclear Spin of Americium-241


DURING the recording of the spark spectrum of americium1 in the third order of the Baird three-metre grating spectrograph, a number of spectral lines appeared as four resolved components of a probable six-member flag pattern. While describing the performance of a 30-ft. Paschen–Runge spectrograph, Tomkins and Tomkins2 have published a photograph of the Am I line at 6405 A. showing it resolved into six components. The six component flag patterns, which lead to a nuclear spin of 5/2 for 95Am241, have been confirmed by interferometric studies.

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  1. 1

    Thorne, R. P., Spectrochimica Acta, [8, 2, 71 (1956)].

  2. 2

    Tomkins, F. S., and Tomkins, Fred M., Spectrochimica Acta, 6, 139 (1954).

  3. 3

    Klinkenberg, P. F. A., Rev. Mod. Phys., 24, 2, 63 (1952).

  4. 4

    Mayer, M. A., Phys. Rev., 78, 16 (1950).

  5. 5

    Tomkins, F. S., and Tomkins, Fred M., J. Opt. Soc. Amer., 39, 357 (1949).

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