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Abstract. Inner bremsstrahlung accompanying the first-forbidden beta decay of 86Rb was measured using the magnetic deflection technique with a 4.5 x 5.1 cm2 NaI(T1) crystal in the energy range 200-1660 keV. The raw spectrum was unfolded using the step-by-step process of Starfelt and Liden and compared with KUB, LF and FM theories. The measured spectrum is found to show fairly good agreement with LF theory in the energy range 200-1500 keV and it is found to deviate thereafter from all three theories.

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