New Result in the Production and Decay of an Isotope,<sup>278</sup>113, of the 113th Element
Kosuke MoritaRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanK. MorimotoRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanD. KajiRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanHiromitsu HabaRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanKazutaka OzekiRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanYuki KudouRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanT. SumitaFaculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, JapanY. WakabayashiRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanAkira YonedaRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanKengo TanakaFaculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, JapanSayaka YamakiDepartment of Physics, Saitama University, Saitama 338-8570, JapanRyutaro SAKAIDepartment of Chemistry, Saitama University, Saitama 338-8570, JapanTakahiro AkiyamaDepartment of Physics, Saitama University, Saitama 338-8570, JapanShin-ichi GotoDepartment of Chemistry, Niigata University, Niigata 950-2181, JapanHiroo HasebeRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanMinghui HuangRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanTianheng HuangInstitute of Modern Physics, Chinese Academy of Science, 730000 Lanzhou, P. R. ChinaE. IdeguchiCenter for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, JapanY. KasamatsuRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanKenji KatoriRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, JapanYoshiki KariyaDepartment of Chemistry, Niigata University, Niigata 950-2181, JapanH. KikunagaResearch Center for Electron Photon Science, Tohoku University, Sendai 982-0826, JapanH. KouraJapan Atomic Energy Agency, Tokai, Ibaraki 319-1195, JapanHisaaki KudoDepartment of Chemistry, Niigata University, Niigata 950-2181, JapanAkihiro MashikoDepartment of Physics, Yamagata University, Yamagata 990-8560, JapanKeita MayamaDepartment of Physics, Yamagata University, Yamagata 990-8560, JapanS. MitsuokaJapan Atomic Energy Agency, Tokai, Ibaraki 319-1195, JapanTôru MoriyaDepartment of Physics, Yamagata University, Yamagata 990-8560, JapanMasashi MurakamiDepartment of Chemistry, Niigata University, Niigata 950-2181, JapanH. MurayamaDepartment of Chemistry, Niigata University, Niigata 950-2181, JapanSaori NamaiDepartment of Physics, Yamagata University, Yamagata 990-8560, JapanAkira OzawaUniversity of Tsukuba, Tsukuba, Ibaraki 305-8071, JapanNozomi SatoJapan Atomic Energy Agency, Tokai, Ibaraki 319-1195, JapanKeisuke SuekiUniversity of Tsukuba, Tsukuba, Ibaraki 305-8071, JapanMirei TakeyamaDepartment of Physics, Yamagata University, Yamagata 990-8560, JapanFuyuki TokanaiDepartment of Physics, Yamagata University, Yamagata 990-8560, JapanTakayuki YamaguchiDepartment of Physics, Saitama University, Saitama 338-8570, JapanAtsushi YoshidaRIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
2012en
ABI
Аннотация
An isotope of the 113th element, i.e., 278[113], was produced in a nuclear reaction with a 70Zn beam on a 209Bi target. We observed six consecutive {\alpha}-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], 274Rg (Z=111), 270Mt (Z=109), 266Bh (Z=107), 262Db (Z=105), and 258Lr (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.
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