Experiment on the Synthesis of Element 113 in the Reaction ²⁰⁹Bi(⁷⁰Zn,n)²⁷⁸113

See also "New 113th Element Has Been Discovered at RIKEN"

Atsushi Shinohara

JPSJ News Comments 1, 01 (2004).

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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 ×10 ¹⁹. 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 cm ²).

https://doi.org/10.1143/JPSJ.73.2593

KEYWORDS: new element²⁷⁸113, new isotopes²⁷⁴111 and²⁷⁰Mt, gas-filled recoil separator

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Experiment on the Synthesis of Element 113 in the Reaction ²⁰⁹Bi(⁷⁰Zn,n)²⁷⁸113