Shape evolution in the neutron-rich osmium isotopes: Prompt γ-ray spectroscopy of Os 196

P. R. John*, V. Modamio, J. J. Valiente-Dobón, D. Mengoni, S. Lunardi, T. R. Rodríguez, D. Bazzacco, A. Gadea, C. Wheldon, T. Alexander, G. De Angelis, N. Ashwood, M. Barr, G. Benzoni, B. Birkenbach, P. G. Bizzeti, A. M. Bizzeti-Sona, S. Bottoni, M. Bowry, A. BraccoF. Browne, M. Bunce, F. Camera, B. Cederwall, L. Corradi, F. C L Crespi, P. Désesquelles, J. Eberth, E. Farnea, E. Fioretto, A. Görgen, A. Gottardo, J. Grebosz, L. Grente, H. Hess, A. Jungclaus, Tzanka Kokalova Wheldon, A. Korichi, W. Korten, A. Kuşoǧlu, S. Lenzi, S. Leoni, J. Ljungvall, G. Maron, W. Meczynski, B. Melon, R. Menegazzo, C. Michelagnoli, T. Mijatović, B. Million, P. Molini, G. Montagnoli, D. Montanari, D. R. Napoli, P. Nolan, Ch Oziol, Zs Podolyák, G. Pollarolo, A. Pullia, B. Quintana, F. Recchia, P. Reiter, O. J. Roberts, D. Rosso, E. Şahin, M. D. Salsac, F. Scarlassara, M. Sferrazza, J. Simpson, P. A. Söderström, A. M. Stefanini, O. Stezowski, S. Szilner, Ch Theisen, C. A. Ur, J. Walshe

*Corresponding author for this work

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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.

Original languageEnglish
Article number021301
JournalPhysical Review C
Issue number2
Publication statusPublished - 13 Aug 2014

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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