理研で113番元素の発見確定（または113番元素の名前大喜利

New Result in the Production and Decay of an Isotope, ^{278}113, of the 113th Element

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 262Db and 258Lr 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
http://jpsj.ipap.jp/link?JPSJ/81/103201/pdf