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The radiations from Hf 181 have been examined with a magnetic lens spectrometer. Four gamma-rays were found having energies of 0.087, 0.134, 0.347, and 0.485 Mev. There is evidence for the existence of a fifth gamma-ray. The maximum energy of the beta-rays was estimated to be 0.41 Mev. The three higher energy gamma-rays were found to have intensities proportional to 11, 29, and 100, respectively. The total internal conversion coefficient for the 0.134-Mev transition was calculated to be 11. Calculations on the lifetime and the ratio of the conversion electrons in the K and L shells indicate that in the transition from the metastable state the nucleus undergoes a spin change of three units.
An intermediate-image spectrometer and a thin-lens spectrometer were used to examine carefully the beta spectra of P 32 , K 42 , and As 76 . The P 32 beta spectrum was examined for a Fierz-type deviation, and within the experimental error none was found. The value of the parameter r, describing the magnitude of the Fierz deviation as defined by Davidson and Peaslee, was found to be 0.00±0.03. The first forbidden transitions with A/ = 0, "yes" of K 42 and As 76 were examined for deviations from a linear Kurie plot. Within experimental error no deviations were found. From the shape factors calculated by Mahmoud and Konopinski on the basis of an STP combination, one would expect deviations for these first-forbidden transitions if the best previous estimate of certain parameters are correct. A deviation of the K 42 Kurie plot below 500 kev was attributed to an additional beta group.
The beta spectrum of Ce 141 has been examined with an intermediate-image spectrometer adapted for coincidence measurements. The beta decay was found to be complex with two beta groups of maximal energies 574±3 kev and 432=1-2 kev. The data obtained indicated the presence of a single gamma ray, with an energy of 144.9±0.7 kev. Coincidence measurements inferred that the gamma ray was in coincidence with the lower-energy beta group. Gamma-ray spectra obtained with a scintillation spectrometer and a thin-lens spectrometer indicated that only one gamma ray is present in Ce 141 . Transitions ascribed to higherand lower-energy beta groups are A/--1, "y es " and A/=0, "yes," respectively. The gamma ray is probably magnetic dipole radiation. An/7/2 state, with odd parity, is assigned to the ground state of Ce 141 ; a #7/2 state, with even parity, is assigned to the first excited state of Pr 141 .
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