Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Struktur und Dynamik von Kernen

HK 32.3: Vortrag

Dienstag, 5. März 2013, 14:45–15:00, HSZ-401

Study of shape transitions in the neutron-rich Os isotopes — •Philipp R. John^1,2, Victor Modamio³, Jose Javier Valiente-Dobón³, Daniele Mengoni¹, and Santo Lunardi^1,2 — 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.