Lifetime measurements of the first 2+ states in 104,106Zr: Evolution of ground-state deformations

• DOI: 10.1016/j.physletb.2015.09.043
• Publication Date: 2015-09-26T04:40:17Z
• Authors: F. Browne; A.M. Bruce; T. Sumikama; I. Nishizuka; S. Nishimura; P. Doornenbal; G. Lorusso; P.-A. Söderström; H. Watanabe; R. Daido; Z. Patel; S. Rice; L. Sinclair; J. Wu; Z.Y. Xu; A. Yagi; H. Baba; N. Chiga; R. Carroll; F. Didierjean; Y. Fang; N. Fukuda; G. Gey; E. Ideguchi; N. Inabe; T. Isobe; D. Kameda; I. Kojouharov; N. Kurz; T. Kubo; S. Lalkovski; Z. Li; R. Lozeva; H. Nishibata; A. Odahara; Zs. Podolyák; P.H. Regan; O.J. Roberts; H. Sakurai; H. Schaffner; G.S. Simpson; H. Suzuki; H. Takeda; M. Tanaka; J. Taprogge; V. Werner; O. Wieland
• Keywords: Nuclide

The first fast-timing measurements from nuclides produced via the in-flight fission mechanism are reported. lifetimes of 2+ states in 104,106Zr nuclei have been measured β-delayed γ-ray timing stopped radioactive isotope beams. An improved precision for lifetime 21+ state 104Zr was obtained, τ(21+)=2.90−20+25 ns, as well a measurement 106Zr, τ(21+)=2.60−15+20 with corresponding reduced transition probabilities B(E2;21+→0g.s.+)=0.39(2)e2b2 and 0.31(1)e2b2, respectively. Comparisons extracted ground-state deformations, β2=0.39(1) (104Zr) β2=0.36(1) (106Zr) model calculations indicate persistence prolate deformation. data show that is most deformed neutron-rich Zr isotopes so far.