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Shape evolution in the neutron-rich osmium isotopes: Prompt γ-ray spectroscopy of Os196

Abstract : The shape transition in the neutron-rich Os isotopes is studied by investigating the neutron-rich 196Os nucleus through in-beam γ-ray spectroscopy using a two-proton transfer reaction from a 198Pt target to a 82Se beam. The beam-like recoils were detected and identified with the large-acceptance magnetic spectrometer PRISMA, and the coincident γ rays were measured with the advanced gamma tracking array (AGATA) demonstrator. The de-excitation of the low-lying levels of the yrast-band of 196Os were identified for the first time. The results are compared with state-of-the-art beyond-mean-field calculations, performed for the even-even 188−198Os isotopes. The new results suggest a smooth transition in the Os isotopes from a more axial rotational behavior towards predominately vibrational nuclei through triaxial configurations. An almost perfect γ-unstable/triaxial rotor yrast band is predicted for 196Os which is in agreement with the experimentally measured excited states.
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http://hal.in2p3.fr/in2p3-01065841
Contributor : Dominique Girod <>
Submitted on : Thursday, September 18, 2014 - 3:52:19 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:31 PM

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P. R. John, V. Modamio, J.J. Valiente-Dobón, D. Mengoni, S. Lunardi, et al.. Shape evolution in the neutron-rich osmium isotopes: Prompt γ-ray spectroscopy of Os196. Physical Review C, American Physical Society, 2014, 90, pp.021301. ⟨10.1103/PhysRevC.90.021301⟩. ⟨in2p3-01065841⟩

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