J. Phys. Soc. Jpn. 81, 103201 (2012) [4 Pages]
LETTERS

New Result in the Production and Decay of an Isotope, 278113, of the 113th Element

+ Affiliations
1RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan2Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan3Department of Physics, Saitama University, Saitama 338-8570, Japan4Department of Chemistry, Saitama University, Saitama 338-8570, Japan5Department of Chemistry, Niigata University, Niigata 950-2181, Japan6Institute of Modern Physics, Chinese Academy of Science, 730000 Lanzhou, P. R. China7Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan8Research Center for Electron Photon Science, Tohoku University, Sendai 982-0826, Japan9Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan10Department of Physics, Yamagata University, Yamagata 990-8560, Japan11University of Tsukuba, Tsukuba, Ibaraki 305-8071, Japan

An isotope of the 113th element, i.e., 278 113, was produced in a nuclear reaction with a 70 Zn beam on a 209 Bi target. We observed six consecutive α-decays following the implantation of a heavy particle in nearly the same position in the semiconductor detector under an extremely low background condition. The fifth and sixth decays are fully consistent with the sequential decays of 262 Db and 258 Lr in both decay energies and decay times. This indicates that the present decay chain consisted of 278 113, 274 Rg ( Z =111), 270 Mt ( Z =109), 266 Bh ( Z =107), 262 Db ( Z =105), and 258 Lr ( Z =103) with firm connections. This result, together with previously reported results from 2004 and 2007, conclusively leads to the unambiguous production and identification of the isotope 278 113 of the 113th element.

©2012 The Physical Society of Japan

References

  • 1 K.Morita, K.Morimoto, D.Kaji, T.Akiyama, S.Goto, H.Haba, E.Ideguchi, R.Kanungo, K.Katori, H.Koura, H.Kudo, T.Ohnishi, A.Ozawa, T.Suda, K.Sueki, H. S.Xu, T.Yamaguchi, A.Yoneda, A.Yoshida, and Y. L.Zhao:J. Phys. Soc. Jpn. 73 (2004) 2593. LinkGoogle Scholar
  • 2 K.Morita, K.Morimoto, D.Kaji, T.Akiyama, S.Goto, H.Haba, E.Ideguchi, K.Katori, H.Koura, H.Kikunaga, H.Kudo, T.Ohnishi, A.Ozawa, N.Sato, T.Suda, K.Sueki, F.Tokanai, T.Yamaguchi, A.Yoneda, and A.Yoshida:J. Phys. Soc. Jpn. 76 (2007) 045001. LinkGoogle Scholar
  • 3 P. A.Wilk, K. E.Gregorich, A.Türler, C. A.Laue, R.Eichler, V.Ninov, J. L.Adams, U. W.Kirbach, M. R.Lane, D. M.Lee, J. B.Patin, D. A.Shaughnessy, D. A.Strellis, H.Nitsche, and D. C.Hoffman:Phys. Rev. Lett. 85 (2000) 2697. CrossrefGoogle Scholar
  • 4 K.Morita, K.Morimoto, D.Kaji, H.Haba, K.Ozeki, Y.Kudou, N.Sato, T.Sumita, A.Yoneda, T.Ichikawa, Y.Fujimori, S.Goto, E.Ideguchi, Y.Kasamatsu, K.Katori, Y.Komori, H.Koura, H.Kudo, K.Ooe, A.Ozawa, F.Tokanai, K.Tsukada, T.Yamaguchi, and A.Yoshida:J. Phys. Soc. Jpn. 78 (2009) 064201. LinkGoogle Scholar
  • 5 L. C.Northcliffe and R. F.Schilling: Nucl. Data Tables A 7 (1970) 233. CrossrefGoogle Scholar
  • 6 K.Morita, K.Morimoto, D.Kaji, H.Haba, E.Ideguchi, R.Kanungo, K.Katori, H.Koura, H.Kudo, T.Ohnishi, A.Ozawa, T.Suda, K.Sueki, I.Tanihata, H.Xu, A. V.Yeremin, A.Yoneda, A.Yoshida, Y.-L.Zhao, and T.Zheng:Eur. Phys. J. A 21 (2004) 257. CrossrefGoogle Scholar
  • 7 D.Kaji, K.Morita, K.Morimoto, H.Haba, and H.Kudo: Proc. Radiochim. Acta 1 (2011) 105. CrossrefGoogle Scholar
  • 8 K.Morita, K.Morimoto, D.Kaji, H.Haba, E.Ideguchi, J. C.Peter, R.Kanungo, K.Katori, H.Koura, H.Kudo, T.Ohnishi, A.Ozawa, T.Suda, K.Sueki, I.Tanihata, H.Xu, A. V.Yeremin, A.Yoneda, A.Yoshida, Y.-L.Zhao, T.Zheng, S.Goto, and F.Tokanai:J. Phys. Soc. Jpn. 73 (2004) 1738. LinkGoogle Scholar
  • 9 B. D.Wilkins, M. J.Fluss, S. B.Kaufman, C. E.Gross, and E. P.Steinberg: Nucl. Instrum. Methods 92 (1971) 381. CrossrefGoogle Scholar
  • 10 R.Dressler, B.Eichler, D. T.Jost, D.Piguet, A.Türler, Ch.Düllmann, R.Eichler, H. W.Gäggeler, M.Gärtner, M.Schädel, S.Taut, and A. B.Yakushev:Phys. Rev. C 59 (1999) 3433. CrossrefGoogle Scholar
  • 11 K.-H.Schmidt, C.-C.Sahm, K.Pielenz, and H.-G.Clerc: Z. Phys. A 316 (1984) 19. CrossrefGoogle Scholar
  • 12 Y. A.Akovali: Nucl. Data Sheets 94 (2001) 131. CrossrefGoogle Scholar
  • 13 R. B.Firestone and V. S.Shirley:Table of Isotopes (Wiley, New York, 1996) 8th ed., Vol. 2, Appendix-F, p. F-47. Google Scholar