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J. Phys. Soc. Jpn. 73 (2004) pp. 2593-2596  |Next Article|  |Table of Contents|
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Experiment on the Synthesis of Element 113 in the Reaction 209Bi(70Zn,n)278113

Kosuke Morita1, Kouji Morimoto1, Daiya Kaji1, Takahiro Akiyama1,2, Sin-ichi Goto3, Hiromitsu Haba1, Eiji Ideguchi4, Rituparna Kanungo1, Kenji Katori1, Hiroyuki Koura5, Hisaaki Kudo6, Tetsuya Ohnishi1, Akira Ozawa7, Toshimi Suda1, Keisuke Sueki7, HuShan Xu8, Takayuki Yamaguchi2, Akira Yoneda1, Atsushi Yoshida1 and YuLiang Zhao9

1RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198
2Department of Physics, Saitama University, Sakura-ku, Saitama 338-8570
3Center for Instrumental Analysis, Niigata University, Ikarashi, Niigata 950-2181
4Center for Nuclear Study, University of Tokyo Wako Branch, Wako, Saitama 351-0198
5Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195
6Department of Chemistry, Niigata University, Ikarashi, Niigata 950-2181
7University of Tsukuba, Tsukuba, Ibaraki 305-8571
8Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
9Institute of High Energy Physics, Chinese Academy of Science, Beijing 100039, China

(Received July 30, 2004)

The convincing candidate event of the isotope of the 113th element, 278113, and its daughter nuclei, 274111 and 270Mt, were observed, for the first time, in the 209Bi + 70Zn reaction at a beam energy of 349.0 MeV with a total dose of 1.7 ×1019. Alpha decay energies and decay times of the candidates, 278113, 274111, and 270Mt, were (11.68 ±0.04 MeV, 0.344 ms), (11.15 ±0.07 MeV, 9.26 ms), and (10.03 ±0.07 MeV, 7.16 ms), respectively. The production cross section of the isotope was deduced to be 55+150-45 fb (10-39 cm2). ©2004 The Physical Society of Japan

KEYWORDS: new element 278113, new isotopes 274111 and 270Mt, gas-filled recoil separator
URL: http://jpsj.ipap.jp/link?JPSJ/73/2593/
DOI: 10.1143/JPSJ.73.2593


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