Development of high efficient gas cell for collecting the r-process nuclei around N=126 and producing the high purity beam of the nuclei

• Project/Area Number: 24740180
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: HIRAYAMA Yoshikazu 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 助教 (30391733)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 国際情報交換 / ベルギー / 元素合成 / アルゴンガスセル / レーザー共鳴イオン化 / ガスセル

Research Abstract

By measuring the half-lives of neutron-rich radioactive nuclei with N=126, it is considered that it is possible to understand the process of nucleosynthesis of heavy elements by a rapid neutron-capture reaction in the cosmos. In order to understand the process, we have developed an argon gas-cell with laser ionization for producing an element- and mass-selected radioactive ion beam. The design of a gas cell was optimized by using a flow simulation. The basic property of the gas cell was investigated from the off-line test using a filament placed in the gas cell and from the on-line test using an accelerated beam at RIKEN facility. We have successfully produced an element- and mass-selected ion beam, whose extraction time of about 200 ms was faster than the gas cell produced so far. Owing to the gas cell, we can measure the half-lives of the radioactive nuclei with N=126 for understanding the element synthesis in the cosmos.

Research Products

• [Journal Article] Ionization cross section measurements for autoionizing states of iridium and rhenium (2014)
  • Author(s): Hirayama Y., Mukai M., Watanabe Y., Imai N., Ishiyama H., Jeong S.-C., Miyatake H., Oyaizu M., Matsuo Y., Sonoda T., Wada M
  • Journal Title: J. Physics B Volume: 47 Issue: 7 Pages: 0752011-8
  • DOI: 10.1088/0953-4075/47/7/075201
  • Peer Reviewed
• [Journal Article] Present Status of KEK Isotope Separation System (2014)
  • Author(s): Y. Hirayama(計14名)
  • Journal Title: European Physical Journal Web conference Volume: 66巻 Pages: 110171-4
  • DOI: 10.1051/epjconf/20146611017
  • Peer Reviewed
• [Journal Article] In-gas-cell laser ion source for KEK isotope separation system (2014)
  • Author(s): M. Mukai, Y. Hirayama(計9名)
  • Journal Title: Review of Scientific Instrument Volume: 85巻
  • Peer Reviewed
• [Journal Article] Off-line test of the KISS gas cell (2013)
  • Author(s): Hirayama Y.,Watanabe Y.X., Imai N., Ishiayma H., Jeong S.C., Miyatake H., Oyaizu M., Kim Y.H., Mukai M., Matsuo Y., Sonoda T., Wada M., Mark H., Kudryavstev Y., Van Duppen P
  • Journal Title: Nucl. Instrum. Meth Volume: 317 Pages: 480-483
  • DOI: 10.1016/j.nimb.2013.06.032
  • Peer Reviewed
• [Journal Article] Study of collisions of 136Xe + 198Pt for the KEK isotope separator (2013)
  • Author(s): Watanabe Y.X., Hirayama Y., Imai N., Ishiyama H., Jeong S.C., Miyatake H., Clement E., de France G., Navin A., Rejmund M., Schmit C., Pollarolo G., Corradi L., Fioretto E., Motanari D., Choi S.H., Kim Y.H., Song J.S., Niikura M., Suzuki D., Nishibata H., Takatsu J.
  • Journal Title: Nucl. Instrum. Meth Volume: B 317 Pages: 752-755
  • DOI: 10.1016/j.nimb.2013.04.036
  • Peer Reviewed
• [Presentation] beta-decay spectroscopy of r-process nuclei with N=126 at KISS (2013)
  • Author(s): Y. Hirayama
  • Organizer: The 12^<th> International Symposium on Origin of Matter and Evolution of Galaxies
  • Place of Presentation: つくば国際会議場
  • Invited
• [Presentation] Development of KEK Isotope Separation System I (2013)
  • Author(s): 平山賀一
  • Organizer: 日本物理学会
  • Place of Presentation: 高知大学朝倉キャンパス
• [Presentation] Development of the KISS ga cell (2013)
  • Author(s): Y. Hirayama
  • Organizer: The 11^<th> IGISOL Workshop
  • Place of Presentation: ユバスキュラ大学(フィンランド)
• [Presentation] Present status of the KEK isotope separation system (2013)
  • Author(s): Y. Hirayama
  • Organizer: The 25^<th> International Nuclear Physics Conference (INPC2013)
  • Place of Presentation: フィレンツェ国際会議場(イタリア)
• [Presentation] beta-decay spectroscopy of r-process nuclei with N=126 at KISS (2013)
  • Author(s): 平山 賀一
  • Organizer: The 12th International Symposium on Origin of Matter and Evolution of Galaxies
  • Place of Presentation: つくば国際会議場
  • Invited
• [Presentation] Development of the KISS gas cell (2013)
  • Author(s): 平山 賀一
  • Organizer: The 11th IGISOL Workshop (Conference on Stopping and Manipulation of Ions, SMI-13)
  • Place of Presentation: ユバスキュラ大学(フィンランド)
• [Presentation] Present status of the KEK isotope separation system (2013)
  • Author(s): 平山 賀一
  • Organizer: The 25th International Nuclear Physics Conference (INPC2013)
  • Place of Presentation: FIRENZE (ITALY)
• [Presentation] On and Off-line test results of the KISS gas cell (2012)
  • Author(s): Y. Hirayama
  • Organizer: Workshop on low-energy radioactive isotope beam production by in-gas laser ionization for decay spectroscopy at RIKEN
  • Place of Presentation: 理化学研究所
  • Invited
• [Presentation] On and Off-line test results of the KISS gas cell (2012)
  • Author(s): Y. Hirayama
  • Organizer: The 16^<th> IUPAPA International conference on electromagnetic isotope separators and techniques related to their applications (EMIS2012)
  • Place of Presentation: 松江くにびきメッセ
• [Presentation] Spectroscopy of r-process nuclei with N=126 by KISS (2012)
  • Author(s): Y. Hirayama
  • Organizer: Workshop on"Gas-cell-based laser ionization spectroscopy developments"
  • Place of Presentation: ルーバンカトリック大学(ベルギー)
  • Invited
• [Presentation] Spectroscopy of r-process nuclei with N=126 by KISS (2012)
  • Author(s): Y. Hirayama
  • Organizer: Workshop on “Gas-Cell-based Laser Ionization Spectroscopy Developments”
  • Place of Presentation: KU Leuven, Belgium
  • Invited
• [Presentation] On and Off-line test results of the KISS gas cell (2012)
  • Author(s): Y. Hirayama
  • Organizer: The 16th IUPAP International Conference on Electromagnetic Isotope Separators and Techniques Related to Their Applications (EMIS2012)
  • Place of Presentation: Matsue, Japan
• [Presentation] On and Off-line test results of the KISS gas cell (2012)
  • Author(s): Y. Hirayama
  • Organizer: Workshop on Low-Energy Radioactive Isotope Beam (RIB) Production by In-Gas Laser Ionization for Decay Spectroscopy at RIKEN
  • Place of Presentation: RIKEN, Japan
  • Invited
• [Remarks]
  • URL: http://kekrnb.kek.jp
• [Remarks] KEK 短寿命核グループのホームページ
  • URL: http://kekrnb.kek.jp
• [Remarks] KEK短寿命核グループ
  • URL: http://kekrnb.kek.jp/