Search for spin-orbit-force reduction at 106,108 Zr around r-process path

T. Sumikama, K. Yoshinaga, Y. Miyashita, K. Sugimoto, J. Chiba, S. Takano, H. Watanabe, S. Nishimura, Z. Li, H. Baba, P. Doornenbal, T. Isobe, G. Lorusso, T. Nakano, M. Kurata-Nishimura, H. Sakurai, D. Steppenbeck, K. Yamaguchi, Y. Ito, A. OdaharaA. Takashima, K. Tajiri, J.S. Berryman, N. Blasi, A. Bracco, F. Camera, O. Wieland, S. Go, S. Hayakawa, E. Ideguchi, S. Kubono, S. Ota, H. Yamaguchi, T. Hashimoto, H.J. Ong, C. Hinke, K. Steiger, D.G. Jenkins, Y. Kawada, N. Kobayashi, Y. Kondo, R. Krücken, Zs. Podolyák, P.M. Walker, H. Scheit, T. Teranishi, Y. Wakabayashi

Research output: Chapter in Book/Report/Conference proceedingChapter


Shell gap at the magic number N = 82 is important to reproduce the 2nd peak of r-process abundance. If a spin-orbit force is reduced in a very neutron-rich region, a shell quenching at N = 82 and a new shell closure at N = 70 are predicted. A shell evolution by the spin-orbit-force reduction can be searched for through the shape evolution of Zr isotopes around an expected double magic nuclei, Zr(Z=40,N=70). We performed β-γ and isomer spectroscopy at RIBF to observe low-lying states in Zr. The present results indicate a well deformed shape for Zr. The drastic reduction of the spin-orbit force most likely does not occur around Zr on an r-process path.
Original languageEnglish
Title of host publicationAIP Conference Proceedings
Publication statusPublished - 1 Jan 2012
EventAIP Conference Proceedings 2011 - Wako, Japan
Duration: 14 Nov 201117 Nov 2011


ConferenceAIP Conference Proceedings 2011

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