Production of 256Lr in the 249,250,251Cf + 11B, 243Am + 18O, and 248Cm + 14N reactions

N. Sato 1 , T. K. Sato 2 , M. Asai 2 , A. Toyoshima 2 , K. Tsukada 2 , Z. J. Li 2 , K. Nishio 2 , Y. Nagame 2 , M. Schädel, H. Haba 4 , S. Ichikawa 4  and H. Kikunaga
  • 1 Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 2 Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 3 GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
  • 4 Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
  • 5 Present address: Research Center for Electron Photon Science, Tohoku University, Mikamine, Sendai, 982-0826, Japan

Abstract

Production cross-sections of the isotope 256Lr in the 249,250,251Cf +11B, 243Am +18O, and 248Cm +14N reactions were measured using a He/KCl gas-jet transport system and a rotating wheel α-particle detection apparatus. The α-particle energy of 256Lr was distributed from 8.3 to 8.7 MeV and its half-life, T1/2, was measured to be 28 ± 1 s. The maximum cross sections in the 249Cf(11B, 4n)256Lr and 243Am(18O, 5n)256Lr reactions were determined to be 122 ± 36 nb at the beam energy of 63 MeV and 26 ± 7 nb at 96 MeV, respectively. In the 248Cm(14N, 6n)256Lr reaction, the cross section was measured to be 27 ± 10 nb at 91 MeV.

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Radiochimica Acta publishes original papers, review articles, and “rapid communications” (short articles of a more timely interest) on all chemical aspects of nuclear science and technology. The journal is geared toward scientists who are actively engaged in research work.

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