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

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. DidierjeanY. 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

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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.

Original languageEnglish
Pages (from-to)448-452
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume750
DOIs
Publication statusPublished - Nov 12 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Browne, F., Bruce, A. M., Sumikama, T., Nishizuka, I., Nishimura, S., Doornenbal, P., Lorusso, G., Söderström, P. A., Watanabe, H., Daido, R., Patel, Z., Rice, S., Sinclair, L., Wu, J., Xu, Z. Y., Yagi, A., Baba, H., Chiga, N., Carroll, R., ... Wieland, O. (2015). Lifetime measurements of the first 2+ states in 104,106Zr: Evolution of ground-state deformations. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 750, 448-452. https://doi.org/10.1016/j.physletb.2015.09.043