Abstract
-particle spectra of have been measured with a double-focusing magnetic spectrometer and with passivated implanted planar silicon (PIPS) detectors. The conversion-electron spectra of have been measured with a cooled Si(Li) detector and with a room-temperature PIPS detector. Precise energies of groups in the decay of have been measured with respect to the known energy of . In addition, -electron, , and coincidence measurements were also performed to determine the spin-parity of the previously known 643.64-keV level. From electron intensities, conversion coefficients of transitions in the daughter have been determined. The measured conversion coefficients of the 333.4- and 388.2-keV transitions are found to be in agreement with the theoretical conversion coefficients for pure multipolarity. On the other hand, the , and conversion coefficients are approximately twice the theoretical values for pure transitions. These measurements indicate anomalous conversion coefficients for the 333.4- and 388.2-keV transitions, as has been pointed out in earlier measurements. The measured conversion coefficient of the 255.5-keV transition gives an multipolarity for this transition which establishes a spin-parity of 7/ and the 7/ single-particle assignment to the 643.64-keV level.
2 More- Received 1 December 2014
- Revised 10 February 2015
DOI:https://doi.org/10.1103/PhysRevC.91.044310
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