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Shape evolution in the neutron-rich osmium isotopes: Prompt gamma-ray spectroscopy of Os-196
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2014 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 90, no 2, 021301- p.Article in journal (Refereed) Published
Abstract [en]

The shape transition in the neutron-rich Os isotopes is studied by investigating the neutron-rich Os-196 nucleus through in-beam gamma-ray spectroscopy using a two-proton transfer reaction from a Pt-198 target to a Se-82 beam. The beam-like recoils were detected and identified with the large-acceptance magnetic spectrometer PRISMA, and the coincident gamma rays were measured with the advanced gamma tracking array (AGATA) demonstrator. The de-excitation of the low-lying levels of the yrast-band of Os-196 were identified for the first time. The results are compared with state-of-the-art beyond-mean-field calculations, performed for the even-even Os188-198 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 gamma-unstable/triaxial rotor yrast band is predicted for Os-196 which is in agreement with the experimentally measured excited states.

Place, publisher, year, edition, pages
2014. Vol. 90, no 2, 021301- p.
Keyword [en]
atomic-nuclei, transition, coexistence, isomers, os
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-153388DOI: 10.1103/PhysRevC.90.021301ISI: 000341105200001ScopusID: 2-s2.0-84922833521OAI: diva2:754322

QC 20141010

Available from: 2014-10-10 Created: 2014-10-03 Last updated: 2014-10-10Bibliographically approved

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Cederwall, Bo
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