Bremsstrahlung emission in α-decay and tunnelling motion of α particles

J. Kasagi, Hirohito Yamazaki, N. Kasajima, T. Ohtsuki, H. Yuki

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    26 Citations (Scopus)


    In α-γ coincidence measurements with Si and Ge detectors, bremsstrahlung photons associated with the α-decay of 210Po and 244Cm were measured. Emission probabilities of the bremsstrahlung deduced for 210Po were 10-11 ∼ 10-12 keV-1 sr-1 decay-1 for 100 ≤ Eγ ≤ 600 keV, and upper limits of the same order of magnitude were obtained for 244Cm. They are much smaller than those predicted by a Coulomb acceleration model and are compared with a quasi-classical calculation in which the bremsstrahlung emission in tunnelling motion of α particles is taken into account. It is shown that the data can be interpreted as a consequence of destructive interference of radiative amplitudes outside the Coulomb barrier with those in tunnelling.

    Original languageEnglish
    Pages (from-to)1451-1457
    Number of pages7
    JournalJournal of Physics G: Nuclear and Particle Physics
    Issue number10
    Publication statusPublished - 1997 Oct 1

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics


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