Search for resonance states in the positronium negative ion

• Project/Area Number: 25887046
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tokyo University of Science
• Principal Investigator: MICHISHIO Koji 東京理科大学, 理学部, 助教 (10710840)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: ポジトロニウム負イオン / 原子・分子物理 / 低速陽電子ビーム / 形状共鳴 / 低速陽電子 / 共鳴光脱離 / 陽電子

Outline of Final Research Achievements

In the present study, a laser spectroscopy of the positronium negative ion has been conducted in order to observe the resonances of 1P symmetry in its one-photon detachment process. By using a high-intensity ion beam and a tunable ultraviolet laser source(225 - 230 nm), we succeeded to observe a shape resonance, which is predicted above Ps (n=2) formation threshold. The estimated resonance energy is in good agreement with three-body calculations.

Research Products

• [Journal Article] Development of energy-tunable positronium beams employing the photodetachment of positronium negative ions (2015)
  • Author(s): K. Michishio, Y. Nagashima
  • Journal Title: Japanese Journal of Applied Physics Conference Proceedings Volume: 2 Pages: 1-9
  • DOI: 10.7567/jjapcp.2.011303
  • Peer Reviewed
• [Journal Article] Profiles of a positronium beam produced using the photodetachment of positronium negative ions (2015)
  • Author(s): K. Michishio, R. H. Suzuki, K. Wada, I. Mochizuki, T. Hyodo, A. Yagishita, Y. Nagashima
  • Journal Title: Nuclear Instruments and Methods in Physics Research A Volume: 785 Pages: 5-8
  • DOI: 10.1016/j.nima.2015.02.042
  • Peer Reviewed
• [Journal Article] Positronium and positronium negative ion emission from alkali-metal coated tungsten surfaces (2014)
  • Author(s): Y. Nagashima, K. Michishio, H. Terabe, R. H. Suzuki, S. Iida, T. Yamashita, R. Kimura, T. Tachibana, I. Mochizuki, K. Wada, A. Yagishita and T. Hyodo
  • Journal Title: Journal of Physics, Conference Series Volume: 505 Pages: 1-6
  • DOI: 10.1088/1742-6596/505/1/012037
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] ポジトロニウム負イオンの光脱離によるエネルギー可変ポジトロニウムビームの形成 (2014)
  • Author(s): 満汐孝治,長嶋泰之
  • Journal Title: 陽電子科学 Volume: 2 Pages: 35-38
  • NAID: 40020446703
• [Journal Article] The simplest three body system: Positronium negative ions (2014)
  • Author(s): Y. Nagashima, K. Michishio, H. Terabe
  • Journal Title: AIP Conference Proceedings Volume: 1588 Pages: 27-34
  • DOI: 10.1063/1.4866920
  • Peer Reviewed
• [Presentation] Observation of a resonance in the photodetachment of positronium negative ions (2015)
  • Author(s): K. Michishio, S. Kuma, T. Kanai, T. Azuma, K. Wada, I. Mochizuki, T. Hyodo, A. Yagishita, Y. Nagashima
  • Organizer: ICPEAC 2015
  • Place of Presentation: Toledo
  • Year and Date: 2015-07-22 – 2015-07-28
• [Presentation] Resonant Photodetachment of Positronium Negative Ions (2015)
  • Author(s): K. Michishio, S. Kuma, T. Kanai, T. Azuma, K. Wada, I. Mochizuki, T. Hyodo, A. Yagishita, Y. Nagashima
  • Organizer: POSMOL 2015
  • Place of Presentation: Lisboa
  • Year and Date: 2015-07-17 – 2015-07-20
  • Invited
• [Presentation] 陽電子蓄積型パルス化装置を用いたポジトロニウムビームの開発Ⅱ (2015)
  • Author(s): 満汐孝治、Luca Chiari、大島永康、長嶋泰之
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] ポジトロニウム負イオンのレーザー分光 (2014)
  • Author(s): 満汐孝治、久間晋、東俊行、和田健、望月出海、兵頭俊夫、柳下明、長嶋泰之
  • Organizer: 平成26年度 京都大学原子炉実験所専門研究会「陽電子科学とその理工学への応用」
  • Place of Presentation: 京都大学原子炉実験所
  • Year and Date: 2014-11-28 – 2014-11-29
• [Presentation] Resonant photodetachment study of the positronium negative ion (2014)
  • Author(s): K. Michishio, S. Kuma, T. Kanai, T. Azuma, K. Wada, I. Mochizuki, T. Hyodo, A. Yagishita, Y. Nagashima
  • Organizer: 原子衝突学会第39回年会
  • Place of Presentation: 東北大学片平キャンパス さくらホール
  • Year and Date: 2014-10-04 – 2014-10-06
• [Presentation] 蓄積型陽電子パルス化装置を用いたポジトロニウムビーム発生装置の開発 (2014)
  • Author(s): 満汐孝治、木村理人、長嶋泰之
  • Organizer: 第51回アイソトープ・放射線研究発表会
  • Place of Presentation: 東京大学 弥生講堂
  • Year and Date: 2014-07-07 – 2014-07-09
• [Presentation] ポジトロニウム負イオンの共鳴光脱離実験 (2014)
  • Author(s): 満汐孝治、金井恒人、東俊行、和田健、望月出海、兵頭俊夫、柳下明、長嶋泰之
  • Organizer: 第51回アイソトープ・放射線研究発表会
  • Place of Presentation: 東京大学 弥生講堂
  • Year and Date: 2014-07-07 – 2014-07-09
• [Presentation] 陽電子蓄積型パルス化装置を用いたポジトロニウムビームの開発 (2014)
  • Author(s): 満汐孝治,木村理人,不破祟博,長嶋泰之
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学（神奈川県）
• [Presentation] ポジトロニウム負イオン分光のためのレーザーシステムの開発 (2014)
  • Author(s): 金井恒人,東俊行,滿汐孝治,長嶋泰之,和田健,望月出海,兵頭俊夫,柳下明
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学（神奈川県）
• [Presentation] ポジトロニウム負イオンの光脱離とポジトロニウムビーム生成への応用 (2013)
  • Author(s): 満汐孝治
  • Organizer: 第38回原子衝突学会年会
  • Place of Presentation: 理化学研究所（埼玉県）
• [Presentation] Development of an energy-tunable positronium beam employing the photodetachment of positronium negative ions (2013)
  • Author(s): K. Michishio
  • Organizer: 2nd Japan-China Joint Workshop on Positron Science
  • Place of Presentation: 産業技術総合研究所（茨城県）
  • Invited