Abstract
Neutron-rich isotopes of palladium were produced via the fission of238U by 20 MeV protons. These isotopes were selected using the ion guide-fed on-line mass-separator facility IGISOL at Jyväskylä. Their decays were studied byβ-ray,γ-ray and conversion-electron spectroscopy. For114Pd and116Pd, the decay schemes established previously were confirmed; additionally multipolarities were determined for a few transitions. In the case of118Pd, only an approximate half-life was known from a previous radiochemical experiment. In the present study, 15 gamma transitions were observed, most of which were placed in a decay scheme. The half-life and the decay energy were found to beT 1/2=1.9±0.1 s andQ β=4.0±0.2 MeV. The decay schemes of114Pd,116Pd and118Pd include — respectively — two, two and four 0+→1+ Gamow-Teller beta transitions with logft values between 4.1 and 5.1. The strength of these transitions is discussed in terms of the extreme single particle shell model with pairing and the spherical proton-neutron quasiparticle random phase approximation. The possible role of deformation is considered using a shell correction method. Predictions for the decay properties of the as yet unobserved120Pd are given.
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The authors from Warsaw and Argonne would like to thank the Academy of Finland and the University of Jyväskylä for making their participation in these experiments possible. Two of them (K.R. and J.Ż.) also acknowledge the support from the Polish Ministry of National Education under the contract CPBP 01.09.
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Koponen, V., Äystö, J., Honkanen, J. et al. Gamow-Teller decay of118Pd and of neighbouring even isotopes of palladium. Z. Physik A - Atomic Nuclei 333, 339–348 (1989). https://doi.org/10.1007/BF01299686
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DOI: https://doi.org/10.1007/BF01299686