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Internal bremsstrahlung from P32, Sr89, Y90, Y91 and Bi210

1964; Elsevier BV; Volume: 55; Linguagem: Inglês

10.1016/0029-5582(64)90127-0

1873-1546

Börje Persson,

Nuclear Physics and Applications

Spectra of internal bremsstrahlung from the beta decays of P32, Sr89, Y90, Y91 and Bi210 have been measured in a coincidence experiment. The beta particles are detected by an anthracene scintillation spectrometer and the bremsstrahlung spectrum is measured by asodium iodide scintillation spectrometer. P32 is an allowed beta emitter and the experimental results are compared with the theory of Knipp and Uhlenbeck and of Bloch, (corrected for the Coulomb effect). The agreement is very good. Sr89, Y90 and Y91 are classified as beta emitters of first order unique forbidden type. The calculations of Madansky et al. (corrected for Coulomb effects) are used for comparison with the experiment. Reasonable agreement is found at the low energy ends of the spectra; but the experiment shows a considerable excess in the medium and high energy ranges. The results for Bi210 are compared with the calculations of Knipp and Uhlenbeck for an allowed transition. The experimental β-spectrum has been used and the Coulomb correction has been performed according to the method of Nilsson. It is found that the calculated spectra fit the experimental ones fairly well.