Spectroscopy of Neutron-Rich 168,170Dy: Yrast Band Evolution Close to the NpNn Valence Maximum

• Published in: arXiv.org 2009-12
• Main Authors: P -A Söderström, Nyberg, J, Regan, P H, Algora, A, de Angelis, G, Ashley, S F, Aydin, S, Bazzacco, D, Casperson, R J, Catford, W N, Cederkäll, J, Chapman, R, Corradi, L, Fahlander, C, Farnea, E, Fioretto, E, Freeman, S J, Gadea, A, Gelletly, W, Gottardo, A, Grodner, E, He, C Y, Jones, G A, Keyes, K, Labiche, M, Liang, X, Liu, Z, Lunardi, S, Mărginean, N, Mason, P, Menegazzo, R, Mengoni, D, Montagnoli, G, Napoli, D, Ollier, J, Pietri, S, Podolyák, Zs, Pollarolo, G, Recchia, F, E \c{S}ahin, Scarlassara, F, Silvestri, R, Smith, J F, K -M Spohr, Steer, S J, Stefanini, A M, Szilner, S, Thompson, N J, Tveten, G M, Ur, C A, Valiente-Dobón, J J, Werner, V, Williams, S J, Xu, F R, Zhu, J Y
• Format: Article
• Language: English
• Subjects: Dysprosium isotopes; Evolution; Gamma rays; Nuclei (nuclear physics); Reaction products; Rotational states
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.0909.4841

The yrast sequence of the neutron-rich dysprosium isotope 168Dy has been studied using multi-nucleon transfer reactions following collisions between a 460-MeV 82Se beam and a 170Er target. The reaction products were identified using the PRISMA magnetic spectrometer and the gamma rays detected using the CLARA HPGe-detector array. The 2+ and 4+ members of the previously measured ground state rotational band of 168Dy have been confirmed and the yrast band extended up to 10+. A tentative candidate for the 4+ to 2+ transition in 170Dy was also identified. The data on these nuclei and on the lighter even-even dysprosium isotopes are interpreted in terms of Total Routhian Surface calculations and the evolution of collectivity in the vicinity of the proton-neutron valence product maximum is discussed.