Rotational bands in 181Ta |
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| Authors: | T.R. Saitoh N. Hashimoto G. Sletten R.A. Bark S. Törmänen M. Bergström K. Furuno K. Furutaka G.B. Hagemann T. Hayakawa T. Komatsubara A. Maj S. Mitarai M. Oshima J. Sampson T. Shizuma P.G. Varmette |
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| Affiliation: | (1) The Niels Bohr Institute, University of Copenhagen, Roskilde, Denmark, DK;(2) Department of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki, Japan, JP;(3) The Japan Atomic Energy Research Institute, Tokai, Ibaraki, Japan, JP;(4) Henryk Niewodniczanski Inst. of Nucl. Phys., Krakow, Poland, PL;(5) Department of Physics, Kyushu University, Fukuoka, Japan, JP;(6) Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK, GB |
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| Abstract: | High-spin states in 181Ta have been studied via the 176Yb(11B,α2n) reaction at 52 MeV using the PEX array and at 57 MeV using the NORDBALL array, with α-particle detection. The previously known, Kπ=(7/2)+ ground state band and Kπ=(9/2)− band have been extended to spins (29/2)+ and (31/2)−, respectively. Two new one-quasiparticle bands, the Kπ=(5/2)+ band built on the known (5/2)+ isomer and a Kπ=((1/2)−) band have been observed. Two other rotational bands with three-quasiparticle structure, Kπ=(15/2)− and ((19/2)+ with π(7/2)[404]ν2(1/2)[510](9/2)[624] and π(9/2)[514]ν2(1/2)[510](9/2)[624] configurations, respectively, have been newly observed. The half-life of the Kπ=((19/2)+) bandhead which decays to the head of the (15/2)− band has been measured to be 140(36) ns. However, transitions from the ((19/2)+) state to the (15/2)− band have not been observed. Received: 26 August 1998 |
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| Keywords: | PACS: 21.10.Re Collective levels – 21.10.Tg Lifetimes – 23.20.En Angular distribution and correlation measurements – 23.20.Lv Gamma transitions and level energies – 27.70.+q 150 ≤ A ≤ 189 |
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