학술논문
Lifetime measurements of the first 2+ states in 104,106Zr: Evolution of ground-state deformations
Document Type
article
Author
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
Source
Physics Letters B, Vol 750, Iss C, Pp 448-452 (2015)
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
Abstract
The first fast-timing measurements from nuclides produced via the in-flight fission mechanism are reported. The lifetimes of the first 2+ states in 104,106Zr nuclei have been measured via β-delayed γ-ray timing of stopped radioactive isotope beams. An improved precision for the lifetime of the 21+ state in 104Zr was obtained, τ(21+)=2.90−20+25 ns, as well as a first measurement of the 21+ state in 106Zr, τ(21+)=2.60−15+20 ns, with corresponding reduced transition probabilities of B(E2;21+→0g.s.+)=0.39(2) e2b2 and 0.31(1) e2b2, respectively. Comparisons of the extracted ground-state deformations, β2=0.39(1) (104Zr) and β2=0.36(1) (106Zr) with model calculations indicate a persistence of prolate deformation. The data show that 104Zr is the most deformed of the neutron-rich Zr isotopes measured so far.