Shape transition in the neutron-rich Y nuclei and its evolution across the isotopic chain

• Main Authors: Iskra Łukasz W., Fornal Bogdan, Leoni Silvia, Michelagnoli Caterina, Bottoni Simone, Cieplicka‒ Oryńczak Natalia, Jentschel Michael, Kandzia Felix, Kim Yung Hee, Köster Ulli, Porzio Carlotta
• Format: Article
• Language: English
• Published: EDP Sciences 2019-01-01
• Series: EPJ Web of Conferences
• Online Access: https://www.epj-conferences.org/articles/epjconf/pdf/2019/28/epjconf_nsd2019_01024.pdf

The evolution of the deformation across the Y isotopic chain, in the vicinity of N = 60 boundary, has been studied using gamma spectroscopy methods. The nuclei of interest have been produced by neutron induced fission of 235U and 241Pu targets, during two experimental campaigns named EXILL and FIPPS at the Institute Laue-Langevin in Grenoble. The emitted gamma rays have been collected by HPGe and LaBr3 detectors providing the identification of the high-spin levels in the 94Y and 96Y isotopes up to 6 MeV excitation energy, as well as information about the half-lives of the in-band states in the 98Y nucleus. The obtained results shed new light on the onset of deformation in the neutron-rich Y isotopes and, in general, in the A ≈ 100 region.