Structural investigation of neutron-deficient Pt isotopes: the case of 178Pt
Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77,
2 iThemba LABS, National Research Foundation, P.O.Box 722, Somerset West, 7129, South Africa
3 Department of Physics, Stellenbosch University, Matieland, Stellenbosch 7602, South Africa
4 Department of Physics, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, South Africa
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Published online: 4 December 2019
Lifetime measurements with the recoil distance Doppler-shift technique have been performed to determine yrast E2 transition strengths in 178Pt. The experimental data are related to those on neighboring Pt isotopes, especially recent data on 180Pt, and compared to calculations within the interacting boson model and a Hartree-Fock Bogoliubov approach. These models predict prolate deformed ground states in Pt isotopes close to neutron midshell consistent with the experimental findings. Further, evidence was found that the prolate intruder structure observed in neutron-deficient Hg isotopes that is minimum in energy in 182Hg becomes the ground state configuration in 178Pt and neighboring 180Pt with nearly identical transition quadrupole moments. The new data on 178Pt are further discussed in the context of the systematics along the Pt isotopic chain with respect to a possible sharp shape transition towards a weakly deformed or a quasi-vibrational ground state whereas the prolate structure increases in energy in 174,176Pt and becomes an intruder configuration similar to, for example, 180,182Hg.
© The Authors, published by EDP Sciences, 2019
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