Production and decay properties of the 1.9-s isomeric state in Rf261

H. Haba, D. Kaji, H. Kikunaga, Y. Kudou, K. Morimoto, K. Morita, K. Ozeki, T. Sumita, A. Yoneda, Y. Kasamatsu, Y. Komori, K. Ooe, and A. Shinohara
Phys. Rev. C 83, 034602 – Published 9 March 2011

Abstract

The 1.9-s isomeric state (Rf261b) in Rf261 was directly populated in the Cm248(O18,5n)Rf261b reaction. Alpha and spontaneous fission (SF) decays of Rf261b, as well as the 68-s state Rf261a, was investigated with a rotating wheel apparatus under low background conditions attained by a gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator. An identification of Rf261b was based on α-α correlations linking α decays of Rf261b and its daughter No257. The α-particle energy of Rf261b was measured to be 8.52 ± 0.05 MeV. The half-life was determined to be 1.9 ± 0.4 s based on both 8.52-MeV α and SF decays. The α and SF branches are 0.27 ± 0.06 and 0.73 ± 0.06, respectively. The cross section for the Cm248(O18,5n)Rf261b reaction is σ(Rf261b) = 11 ± 2 nb at 95.1 MeV, which gives a cross-section ratio of σ(Rf261a)/σ(Rf261b) = 1.1 ± 0.2.

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  • Received 25 September 2010

DOI:https://doi.org/10.1103/PhysRevC.83.034602

©2011 American Physical Society

Authors & Affiliations

H. Haba*, D. Kaji, H. Kikunaga, Y. Kudou, K. Morimoto, K. Morita, K. Ozeki, T. Sumita, and A. Yoneda

  • Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan

Y. Kasamatsu, Y. Komori, K. Ooe, and A. Shinohara

  • Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

  • *haba@riken.jp

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Vol. 83, Iss. 3 — March 2011

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