Structural investigation of neutron-deficient Pt isotopes: the case of 178Pt

• Main Authors: Fransen Christoph, Mammes Franziska, Bark Robert, Braunroth Thomas, Buthelezi Zinhle, Dewald Alfred, Dinoko Tshepo, Förtsch Siegie, Hackstein Matthias, Jolie Jan, Jones Pete, Lawrie Elena, Litzinger Julia, Müller-Gatermann Claus, Newman Richard, Saed-Samii Nima, Sharpey-Schafer John F., Shirinda Obed, Smit Ricky, Warr Nigel, Wiedeking Mathis, Zell Karl-Oskar
• Format: Article
• Language: English
• Published: EDP Sciences 2019-01-01
• Series: EPJ Web of Conferences
• Online Access: https://www.epj-conferences.org/articles/epjconf/pdf/2019/28/epjconf_nsd2019_01016.pdf

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.