Abstract
Hulme, Mott, Oppenheimer and Taylor1 remarked that a γ-ray due to a transition between levels of the same parity may be a mixture of magnetic dipole and electric quadripole radiations. This is possible when the change ΔI in the quantum number I for the total nuclear spin is ± 1 or 0. The relative proportions in the mixture will depend on the structure of the nucleus. For δI= ±2, no parity change, magnetic dipole radiation is forbidden and nearly pure electric quadripole radiation will be emitted. An exception occurs if the spin change is 10, when the radiation must be pure magnetic dipole.
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References
Hulme, H. R., Mott, N. F., Oppenheimer, F., and Taylor, H. M., Proc. Roy. Soc., A, 155, 215 (1936).
Thibaud, J., Ann. de Phys., 5, 73 (1926).
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Martin, Richardson and Hsü, Yun-Kuei, Proc. Phys. Soc. Lond. (in the press).
Siegbahn, K., and Johansson, A., Ark. Mat. Astron. o. Fys., 34A, No. 10 (1947).
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RICHARDSON, H. Spin-Dependence of Magnetic Dipole Gamma Radiation and the Nuclear Level Scheme of Pb208. Nature 161, 516–518 (1948). https://doi.org/10.1038/161516b0
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DOI: https://doi.org/10.1038/161516b0
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