Inner Bremsstrahlung Following the ¹⁶⁹Er Beta Decay

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The spectral distribution of the Internal Bremsstrahlung from the forbidden beta decay of ¹⁶⁹Er was measured from 50 to 290 keV with a NaI(Tl) scintillation spectrometer with a standard geometrical arrangement. The experimental results agree fairly well in the middle photon energy region i.e., from 70 to 210 keV with the KUB theory and at high as well as at low photon energies, the Nilsson theory is found to explain the observed excess over KUB theory.