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

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

Tsutomu Shinozuka, Noboru Takigawa
JPSJ News Comments 9,  17 (2012).

Kosuke Morita1, Kouji Morimoto1, Daiya Kaji1, Hiromitsu Haba1, Kazutaka Ozeki1, Yuki Kudou1, Takayuki Sumita2,1, Yasuo Wakabayashi1, Akira Yoneda1, Kengo Tanaka2,1, Sayaka Yamaki3,1, Ryutaro Sakai4,1, Takahiro Akiyama3,1, Shin-ichi Goto5, Hiroo Hasebe1, Minghui Huang1, Tianheng Huang6, Eiji Ideguchi7, Yoshitaka Kasamatsu1, Kenji Katori1, Yoshiki Kariya5, Hidetoshi Kikunaga8, Hiroyuki Koura9, Hisaaki Kudo5, Akihiro Mashiko10, Keita Mayama10, Shin-ichi Mitsuoka9, Toru Moriya10, Masashi Murakami5, Hirohumi Murayama5, Saori Namai10, Akira Ozawa11, Nozomi Sato9, Keisuke Sueki11, Mirei Takeyama10, Fuyuki Tokanai10, Takayuki Yamaguchi3, and Atsushi Yoshida1
+ 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
Received August 29, 2012; Accepted September 10, 2012; Published September 27, 2012

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
https://doi.org/10.1143/JPSJ.81.103201
KEYWORDS: new element 113, gas-filled recoil ion separator, α-decay chain

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