Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Struktur und Dynamik von Kernen
HK 32.3: Talk
Tuesday, March 5, 2013, 14:45–15:00, HSZ-401
Study of shape transitions in the neutron-rich Os isotopes — •Philipp R. John1,2, Victor Modamio3, Jose Javier Valiente-Dobón3, Daniele Mengoni1, and Santo Lunardi1,2 — 1Dipartimento di Fisica e Astronomia, Universitá degli Studi di Padova, Padua, Italy — 2INFN Sezione di Padova, Padua, Italy — 3INFN Laboratori Nazionali di Legnaro, Legnaro (Pd), Italy
The nuclei with A≈190 between Hf and Pt exhibit a great variety of nuclear phenomena, including K-isomeric states, triaxiality and shape transitions across isotopic and isotonic chains. Of particular interest is the transition from axially symmetric deformed, prolate (γ = 0∘) to oblate (γ = 60∘) shapes in the Os isotopic chain. While a study of the neutron-rich 194Os nucleus populated via deep-inelastic reactions suggests a prolate shape for its yrast states, an other study proposed an oblate shape for the ground state of 198Os by comparing the excitation energies of the first and second 2+ states. For 196Os, the even-even isotope lying between the two, both an oblate and a prolate shape were predicted by microscopic many-body and Total Routhian Surface calculations, respectively. To further elucidate this shape transition and to refine the nuclear models, the key nucleus 196Os was investigated through gamma-spectroscopy using the AGATA demonstrator and the large acceptance heavy ion spectrometer PRISMA at LNL, Italy. A two nucleon transfer from a 198Pt target to a stable 82Se beam was utilized to populate medium-high spin states of 196Os. The current status of the analysis including preliminary results will be presented.