Abstract
Very neutron deficient isotopes in the Hf-Re region were produced by bombarding targets of107, 109Ag,nat, 108, 110Pd, and103Rh with58Ni accelerated by the linear accelerator UNILAC at GSI. After separation from the projectile beam by the velocity filter SHIP, the fusion products were implanted with their full recoil energy into a silicon surface barrier detector. The subsequent alpha decay of the implanted ions was measured with the same detector. In some of the experiments the evaporation residues were implanted into a position sensitive silicon surface barrier detector. With a newly developed position and time correlation technique parent daughter relationships, half lives, andα branching ratios of a large number of isotopes could be determined. In the investigated reactions the eleven new isotopes161–164Re,160W,157–161Ta, and156Hf could be identified. The measuredQ α values, half lives, and a branching ratios are discussed. Two new high energyα. transitions of (7,408±10) keV and (7,804±15) keV were also found with half lives of 2.7 ms and 0.52 ms, respectively.A tentative mass and atomic number assignment givesA=153–156 andZ=70–72. The energies of the excited isomeric states are between 2 MeV and 3 MeV. From the systematics of alpha ground state transitions in even nuclei a hindrance of 105 can be deduced for both transitions, possibly indicating orbital angular momenta on the order of 10ħ for the alpha emitting states. The isomers are proposed to belong to shell model isomers beyond146Gd.
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The authors acknowledge with pleasure the help of many groups which supported our experiments. Especially we thank the accelerator group providing excellent beams and the target laboratory producing our targets. Data collection and data analysis have become possible by the achievements provided by the experimental electronics group and the program development group of the GSI computer center.
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Hofmann, S., Faust, W., Münzenberg, G. et al. Alpha decay studies of very neutron deficient isotopes of Hf, Ta, W, and Re. Z Physik A 291, 53–70 (1979). https://doi.org/10.1007/BF01415817
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DOI: https://doi.org/10.1007/BF01415817