Searching for new elements and chemistry of superheavy elements

2011 Fiscal Year Final Research Report

• Project/Area Number: 19002005
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering; Mathematics and Physics
• Research Institution: The Institute of Physical and Chemical Research
• Principal Investigator: MORITA Kosuke 独立行政法人理化学研究所, 森田超重元素研究室, 准主任研究員 (20250110)
• Project Period (FY): 2007 – 2011
• Keywords: 超重元素 / 反跳分離器 / 113番元素 / 超重元素の化学 / 新同位体 / 加速器

Research Abstract

(1) We conducted the experiment searching for the third atom of the 113^<th> element^<278> 113 which we observed twice before. We did not observe the atom during the period of this project. It was shown that the production probability of the atom is smaller than we expected at the beginning of the project.(2) We designed and constructed a new device for chemistry study of superheavy elements. We commissioned the device resulting that the performance of the device achieves the designed one.(3) We conducted the experiment to study nuclear spectroscopic properties of^<266> Bh(Z=107) which is a great grand-daughter of the isotope^<278> 113, and was not well studied before. The result provided further confirmation of the production of the isotope^<278> 113 of element 113.

Research Products

• [Journal Article] Production of^<265> Sg in the^<248> Cm(^<22> Ne, 5n)^<265> Sg reaction and decay properties of two isomeric states in^<265> Sg (2012)
  • Author(s): H. Haba, D. Kaji, Y. Kudou, K. Morimoto, K. Morita, K. Ozeki, R. Sakai, T. Sumita, A. Yoneda, Y. Kasamatsu, Y. Komori, A. Shinohara, H. Kikunaga, H. Kudo, K. Nishio, K. Ooe, N. Sato, and K. Tsukada
  • Journal Title: Phys. Rev Volume: C85 Pages: 024611-1-11
• [Journal Article] Production and decay properties of the 1.9-s isomeric state in^<261> Rf (2011)
  • Author(s): H. Haba, D. Kaji, H. Kikunaga, Y. Kudou, K. Morimoto, K. Morita, K. Ozeki, T. Sumita, A. Yoneda, Y. Kasamatsu, Y. Komori, K. Ooe, and A. Shinohara
  • Journal Title: Phys. Rev Volume: C83 Pages: 034602-1-7
• [Journal Article] Production and Decay Properties of^<264> Hs and^<265> Hs (2011)
  • Author(s): N. Sato, H. Haba, T. Ichikawa, D. Kaji, Y. Kudou, K. Morimoto, K. Morita, K. Ozeki, T. Sumita, A. Yoneda, E. Ideguchi, H. Koura, A. Ozawa, T. Shinozuka, T. Yamaguchi, and A. Yoshida
  • Journal Title: J. Phys. Soc. Jpn Volume: 80 Pages: 094201-1-7
• [Journal Article] Decay Properties of^<266> Bh and^<262> Db Produced in the^<248> Cm+^<23> Na Reaction (2009)
  • Author(s): K. Morita, K. Morimoto, D. Kaji, H. Haba, K. Ozeki, Y. Kudou, N. Sato, T. Sumita, A. Yoneda, T. Ichikawa, Y. Fujimori, S. Goto, E. Ideguchi, Y. Kasamatsu, K. Katori, Y. Komori, H. Koura, H. Kudo, K. Ooe, A. Ozawa, F. Tokanai, K. Tsukada, T. Yamagichi, and
  • Journal Title: J. Phys. Soc. Jpn Volume: 78 Pages: 064201-1-6
• [Journal Article] RIKEN Gas-filled Recoil Ion Separator(GARIS) as a Promising Interface for Superheavy Element Chemistry-Production of Element 104,^<261> Rf, Using the GARIS/Gas-jet System (2009)
  • Author(s): H. Haba, D. Kaji, Y. Komori, Y. Kudou, K. Morimoto, K. Morita, K. Ooe, K. Ozeki, N. Sato, A. Shinohara, and A. Yoneda
  • Journal Title: Chem. Lett Volume: 38 Pages: 426-427
• [Journal Article] Production and Decay Properties of^<263> Hs (2009)
  • Author(s): D. Kaji, K. Morimoto, N. Sato, T. Ichikawa, E. Ideguchi, K. Ozeki, H. Haba, H. Koura, Y. Kudou, A. Ozawa, T. Sumita, T. Yamaguchi, A. Yoneda, A. Yoshida, and K. Morita
  • Journal Title: J. Phys. Soc. Jpn Volume: 78 Pages: 035003-1-2
• [Journal Article] Performance of the Gas-jet Transport System Coupled to the RIKEN Gas-filled Recoil Ion Separator GARIS for the^<238> U(^<22> Ne, 5n)^<255> No Reaction (2008)
  • Author(s): H. Haba, H. Kikunaga, D. Kaji, T. Akiyama, K. Morimoto, K. Morita, N. Sato, A, Yoneda. K. Ooe, A. Shinohara, T. Takabe, T. Nanri, D. Suzuki, I. Yamazaki, and A. Yokoyama
  • Journal Title: J. Nucl. Radiochem. Sci Volume: 9 Pages: 27-31
• [Journal Article] Startup of superheavy element chemistry at RIKEN (2007)
  • Author(s): H. Haba, T. Akiyama, D. Kaji D, H. Kikunaga, T. Kuribayashi, K. Morimoto, K. Morita, K. Ooe, N. Sato, A. Shinohara, T. Takabe, Y. Tashiro, A. Toyoshima, A. Yoneda, and T. Yoshimura
  • Journal Title: Eur. Phys. J Volume: D45 Pages: 81-86
• [Journal Article] Development of Gas-jet Transport System Coupled to the RIKEN Gas-filled Recoil Ion Separator GARIS for Superheavy Element Chemistry (2007)
  • Author(s): H. Haba, D. Kaji, H. Kikunaga, T. Akiyama, N. Sato, K. Morimoto, A. Yoneda, K. Morita, T. Takabe, and A. Shinohara
  • Journal Title: J. Nucl. Radiochem. Sci Volume: 8 Pages: 55-58
• [Presentation] Search for superheavy elements in RIKEN (2011)
  • Author(s): K. Morita
  • Organizer: 32nd Mazurian Lake Conference on Physics,'Legacy of Maria Sk. odowaska-Curie. 100 years after discovery of atomic nucleus
  • Place of Presentation: Piaski, Poland
  • Year and Date: 20110911-18
• [Presentation] Study of the heaviest elements at RIKEN, status and perspective (2011)
  • Author(s): K. Morita
  • Organizer: The 4th International Conference on the Chemistry and Physics of the Transactinide Elements(TAN 11)
  • Place of Presentation: Sochi, Russia
  • Year and Date: 20110905-11
• [Presentation] Production of S^^<265>g for chemical studies using the gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator (2011)
  • Author(s): H. Haba
  • Organizer: The 4th International Conference on the Chemistry and Physics of the Transactinide Elements(TAN 11)
  • Place of Presentation: Sochi, Russia
  • Year and Date: 20110905-11
• [Presentation] GARIS-II開発の現状と初動試験 (2011)
  • Author(s): 加治大哉,羽場宏光,笠松良崇,工藤祐生,森本幸司,森田浩介,大関和貴,住田貴之,米田晃,佐藤望,若林泰生,村上昌史,門叶冬樹,生井沙織
  • Organizer: 第65回日本物理学会(春季)
  • Place of Presentation: 新潟大学
  • Year and Date: 20110300
• [Presentation] C^^<248> m+O^^<18>反応によるRf同位体の励起関数の測定 (2011)
  • Author(s): 村上昌史, 他
  • Organizer: 2011日本放射化学会年会・第55回放射化学討論会
  • Place of Presentation: 長野市
  • Year and Date: 2011-09-22
• [Presentation] 超重核のα(e)-γ核分光研究を目的としたSi-CdTe検出器アレイの開発 (2011)
  • Author(s): 武山美麗, 他
  • Organizer: 2011日本放射化学会年会・第55回放射化学討論会
  • Place of Presentation: 長野市
  • Year and Date: 2011-09-20
• [Presentation] 新元素の探索-113番元素発見- (2011)
  • Author(s): 森田浩介
  • Organizer: 豊橋技術科学大学セミナー
  • Place of Presentation: 豊橋愛知
  • Year and Date: 2011-06-23
• [Presentation] Recent results on SHE at RIKEN (2011)
  • Author(s): K. Morita
  • Organizer: The 4th International Conference Fusion11
  • Place of Presentation: Saint-Malo, France
  • Year and Date: 2011-05-05
• [Presentation] GARIS-II commissioning# 1 (2010)
  • Author(s): 加治大哉,羽場宏光,笠松良崇,工藤祐生,森本幸司,森田浩介,大関和貴,住田貴之,米田晃,佐藤望,若林泰生,村上昌史,門叶冬樹,生井沙織
  • Organizer: 第54回放射化学討論会
  • Place of Presentation: 大阪大学
  • Year and Date: 20100927-29
• [Presentation] New gas-filled recoil ion separator GARIS-II developed for SHE study (2010)
  • Author(s): D. Kaji, et al
  • Organizer: 2010 International Chemical Congress of Pacific Basin Societies(PACIFICHEM 2010)
  • Place of Presentation: Hawaii, USA
  • Year and Date: 2010-12-19
• [Presentation] Confirmations of the synthesis of 278113 produced by the 209Bi(70Zn, n) 278113 reaction (2010)
  • Author(s): K. Morimoto, et al
  • Organizer: 2010 International Chemical Congress of Pacific Basin Societies(PACIFICHEM 2010)
  • Place of Presentation: Hawaii, USA
  • Year and Date: 2010-12-19
• [Presentation] FIA-based continuous extraction system for superheavy element chemistry (2010)
  • Author(s): Y. Kudou, et al
  • Organizer: 2010 International Chemical Congress of Pacific Basin Societies(PACIFICHEM 2010)
  • Place of Presentation: Hawaii, USA
  • Year and Date: 2010-12-18
• [Presentation] Superheavy Element Nuclear Chemistry at RIKEN (2010)
  • Author(s): H. Haba, et al
  • Organizer: 2010 International Chemical Congress of Pacific Basin Societies(PACIFICHEM 2010)
  • Place of Presentation: Hawaii, USA
  • Year and Date: 2010-12-18
• [Presentation] 超重元素領域における核種同定のための電離箱の開発 (2010)
  • Author(s): 住田貴之,大関和貴, 他
  • Organizer: 2010日本放射化学会年会・第54回放射化学討論会
  • Place of Presentation: 吹田市
  • Year and Date: 2010-09-27
• [Presentation] C^^<248>m( N^^<22>e, 5n) S^^<265>g反応によるS^^<265>gの合成 (2010)
  • Author(s): 羽場宏光, 他
  • Organizer: 2010日本放射化学会年会・第54回放射化学討論会
  • Place of Presentation: 吹田市
  • Year and Date: 2010-09-27
• [Presentation] Superheavy Element Chemistry at RIKEN (2010)
  • Author(s): K. Morita
  • Organizer: International Nuclear Physics Conference(INPC2010)
  • Place of Presentation: Vancouver, Canada
  • Year and Date: 2010-07-07
• [Presentation] Synthesis of the heaviest elements at RIKEN (2009)
  • Author(s): K. Morita
  • Organizer: International Symposium "Periodic Table of D. I. Mendeleev. The new superheavy elements"
  • Place of Presentation: Dubna
  • Year and Date: 20090120-21
• [Presentation] RIKEN GARIS as a Promising Interface for Superheavy Element Chemistry-Production of 261Rf Using the GARIS/Gas-jet System (2009)
  • Author(s): H. Haba
  • Organizer: 7th Japan-China Joint Nuclear Physics Symposium
  • Place of Presentation: Tsukuba Japan
  • Year and Date: 2009-11-13
• [Presentation] Decay Properties of^<266> Bh and^<262> Db Produced in the^<248> Cm+^<23> Na Reaction (2009)
  • Author(s): K. Morita, et al
  • Organizer: Third Joint Meeting of the Nuclear Physics Division of the American Physical Society and the Physical Society of Japan
  • Place of Presentation: Waikoloa, Hawaii
  • Year and Date: 2009-10-16
• [Presentation] Superheavy Element Nuclear Chemistry at RIKEN (2009)
  • Author(s): H. Haba, et al
  • Organizer: 7th Workshop on the Chemistry of the Heaviest Elements
  • Place of Presentation: Mainz, Germany
  • Year and Date: 2009-10-13
• [Presentation] Production and decay properties of H^^<263, 264, 265>s (2009)
  • Author(s): N. Sato
  • Organizer: 7th Workshop on the Chemistry of the Heaviest Elements
  • Place of Presentation: Mainz, Germany
  • Year and Date: 2009-10-12
• [Presentation] 新元素の化学-反跳核分離装置を用いた新たな展開- (2009)
  • Author(s): 羽場宏光
  • Organizer: 第53回放射化学討論会(招待講演)
  • Place of Presentation: 世田谷区桜上水
  • Year and Date: 2009-09-29
• [Presentation] 新同位体^<263> Hsの生成および壊変特性 (2009)
  • Author(s): 加治大哉,森本幸司,佐藤望,羽場宏光,市川隆俊,井手口栄治,小浦寛之,工藤祐生,小沢顕,大関和貴,住田貴之,山口貴之,米田晃,吉田敦,森田浩介
  • Organizer: 第53回放射化学討論会
  • Place of Presentation: 日本大学
  • Year and Date: 2009-09-28
• [Presentation] Superheavy Research at RIKEN (2009)
  • Author(s): K. Morita
  • Organizer: The 10th International Conference on Nucleus-Nucleus Collisions(NN2009)
  • Place of Presentation: Beijing China
  • Year and Date: 2009-08-18
• [Presentation] 新元素発見-周期表を埋める113番元素- (2009)
  • Author(s): 森田浩介
  • Organizer: 日本香粧品学会第34回年会(特別講演)
  • Year and Date: 2009-06-11
• [Presentation] GARIS用回転式Cm-248標的の作成 (2008)
  • Author(s): 工藤祐生
  • Organizer: 第52回放射化学討論会
  • Place of Presentation: 広島大学
  • Year and Date: 2008-09-27
• [Presentation] Superheavy research in Japan (2008)
  • Author(s): K. Morita
  • Organizer: INTERNATIONAL SCHOOL OF NUCLEAR PHYSICS 'Heavy-Ion Collisions from the Coulomb Barrier to the Quark-Gluon Plasma'
  • Place of Presentation: Erice, Italy
  • Year and Date: 2008-09-17
• [Presentation] 理研における新たな反跳分離装置の開発 (2007)
  • Author(s): 佐藤望,加治大哉,森田浩介,森本幸司,羽場宏光,米田晃,菊永英寿,市川隆敏,秋山隆宏
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学
  • Year and Date: 20070921-24
• [Presentation] 超重元素化学研究に向けた理研加速器施設の準備状況 (2007)
  • Author(s): 羽場宏光
  • Organizer: 京都大学原子炉実験所第3回「核化学・核物理の新領域としての重元素科学」専門研究会
  • Place of Presentation: 大阪
  • Year and Date: 2007-12-12
• [Presentation] Experiments on searching for the heaviest elements (2007)
  • Author(s): K. Morita
  • Organizer: Nuclear Cluster Conference(Cluster'07)
  • Place of Presentation: Stratford-upon-Avon, England
  • Year and Date: 2007-09-05
• [Presentation] Experiments on searching for the heaviest elements (2007)
  • Author(s): K. Morita
  • Organizer: International Nuclear Physics Conference(INPC2007)
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2007-06-05
• [Remarks]
  • URL: http://www.riken.jp/r-world/research/lab/nishina/element/index.html