Abstract
Theβ +-decay of 1.4 min159Yb was studied at the YAS-NAPP-2 facility installed on the proton beam of the JINR Dubna phasotron. The singles γ-ray spectra and prompt and delayedγ-γ coincidences were measured on the multidetector system. The decay scheme of159Yb was proposed on the basis of theγ-γ coincidence data. The low lying states of159Tm were preliminary identified within the framework of the rotational model.
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On leave from the Institute of Nuclear Physics, 25068 Řež, Czechoslovakia
The authors are indebted to their colleagues in the YASNAPP-2 group, in particular to Dr. A.A. Solnyshkin and Dr. Yu.V. Yushkevich, for their help with experiment, and to Dr. D. Srnka from the Institute of Nuclear Physics in Řež for preparation of the detectors.