Rotational bands in 181Ta |
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| Authors: | TR Saitoh N Hashimoto G Sletten RA Bark S Törmänen M Bergström K Furuno K Furutaka GB Hagemann T Hayakawa T Komatsubara A Maj S Mitarai M Oshima J Sampson T Shizuma PG Varmette |
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| Institution: | (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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