Improvement of a spin polarizing system for unstable nuclei

• Project/Area Number: 23540335
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: WAKUI TAKASHI 東北大学, サイクロトロン・ラジオアイソトープセンター, 助教 (70359644)
• Co-Investigator(Kenkyū-buntansha): SHINOZUKA Tsutomu 東北大学, サイクロトロン・ラジオアイソトープセンター, 非常勤講師 (10134066)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2011: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: スピン偏極 / 不安定核 / 芳香族分子 / 固体標的

Research Abstract

To study nuclear moments of neutron-rich nuclei in medium mass region, we have been developing a nuclear spin polarizing system for unstable nuclei. The system is used at CYRIC with slow RI beam from the RF ion guide isotope separator on-line. The system thus works in vacuum, room temperature, and low magnetic field, under which nuclear spin polarization has not been realized so far. In this study, we have newly installed an Ar-ion laser instead of a Nd:YAG laser for the optical excitation, and a cooling mechanism for the crystal in which protons are polarized. After the optimization of polarization parameters such as pulse width and repetition rate for the laser and temperature of the crystal, we have conducted polarizing tests. From the results, the polarization is more than 10 times higher than that before this study. We have succeeded in increasing the polarization by the improvement of the polarizing system.

Research Products

• [Journal Article] Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control (2013)
  • Author(s): S. Sakaguchi, T. Wakui, 他7名
  • Journal Title: Nucl. Instrum. And Methods B Volume: 317 Pages: 679-684
  • DOI: 10.1016/j.nimb.2013.07.067
  • Peer Reviewed
• [Journal Article] Ｎｏｂｅｌ ｎｕｃｌｅａｒ ｌａｓｅｒ ｓｐｅｃｔｒｏｓｃｏｐｙ ｍｅｔｈｏｄ ｕｓｉｎｇ ｓｕｐｅｒｆｌｕｉｄ ｈｅｌｉｕｍ ｆｏｒ ｍｅａｓｕｒｅｍｅｎｔ ｏｆ ｓｐｉｎｓ ａｎｄ ｍｏｍｅｎｔｓ ｏｆ ｅｘｏｔｉｃ ｎｕｃｌｅｉ (2013)
  • Author(s): Ｔ． Ｆｕｒｕｋａｗａ
  • Journal Title: Ｎｕｃｌ． Ｉｎｓｔｒｕｍ． ａｎｄ Ｍｅｔｈｏｄｓ Ｂ Volume: ３１７ Pages: 590-594
  • DOI: 10.1016/j.nimb.2013.08.023
  • Peer Reviewed
• [Journal Article] Control of stopping position of radioactive ion beam in superfluid helium for laser spectroscopy experiments (2013)
  • Author(s): X. F. Yang, T. Furukawa, T. Wakui, K. Imamura, H. Tetsuka, T. Fujita, Y. Yamaguchi, Y. Tsutsui, Y. Mitsuya, Y. Ichikawa, Y. Ishibashi, N. Yoshida, H. Shirai, Y. Ebata, M. Hayasaka, S. Arai, S. Muramoto, A. Hatakeyama, M. Wada, T. Sonoda, Y. Ito, T. Kobayashi, S. Nishimura, M. Nishimura, Y. Kondo, et al.
  • Journal Title: Nuclear Instruments and Methods in Physics Researches Section B Volume: 317 Pages: 599-602
  • DOI: 10.1016/j.nimb.2013.07.068
  • Peer Reviewed
• [Journal Article] Development of a resonant laser ionization gas cell for high-energy, short-lived nuclei (2013)
  • Author(s): T. Sonoda, T. Shinozuka, T. Wakui, 他21名
  • Journal Title: Nucl. Instrum. and Methods B Volume: 295 Pages: 1-10
  • Peer Reviewed
• [Journal Article] Shallow and diffuse spin-orbit potential for proton elastic scattering from neutron-rich helium isotopes at 71~MeV/nucleon (2013)
  • Author(s): S. Sakaguchi, T. Nakamura et al.
  • Journal Title: Phys.Rev.C Volume: 021601 Issue: 2 Pages: 87-87
  • DOI: 10.1103/physrevc.87.021601
  • Peer Reviewed
• [Journal Article] Ａｎａｌｙｚｉｎｇ ｐｏｗｅｒ ｉｎ ｅｌａｓｔｉｃ ｓｃａｔｔｅｒｉｎｇ ｏｆ ｐｏｌａｒｉｚｅｄ ｐｒｏｔｏｎｓ ｆｒｏｍ ｎｅｕｔｒｏｎ－ｒｉｃｈ ｈｅｌｉｕｍ ｉｓｏｔｏｐｅｓ (2013)
  • Author(s): Ｓ． Ｓａｋａｇｕｃｈｉ
  • Journal Title: Ｆｅｗ－ｂｏｄｙ ｓｙｓｔｅｍｓ Volume: ５４ Pages: 7-10
  • Peer Reviewed
• [Journal Article] Development of a resonance laser ionization gas cell for high-energy, short-lived nuclei (2013)
  • Author(s): T. Sonoda, M. Wada, H. Tomita, C. Sakamoto, T. Takatsuka, T. Furukawa, H. Iimura, Y. Ito, T. Kubo, Y. Matsuo, H. Mita, S. Naimi, S. Nakamura, T. Noto, P. Schury, T. Shinozuka, T. Wakui, H. Miyatake, S. Jeong, H. Ishiyama, Y. X. Watanabe, Y. Hirayama, K. Okada, A. Takamine
  • Journal Title: Nucl. Instr. Meth. Phys. Res. B Volume: 295 Pages: 1-10
  • DOI: 10.1016/j.nimb.2012.10.009
  • Peer Reviewed
• [Journal Article] Analyzing power in elastic scattering of 6He from polarized proton target at 71 MeV/nucleon (2011)
  • Author(s): S. Sakaguchi et al.
  • Journal Title: Phys. Rev. Volume: C84 Issue: 2 Pages: 24604-24604
  • DOI: 10.1103/physrevc.84.024604
  • Peer Reviewed
• [Journal Article] Chirality in the Mass 80 Region: 79Kr (2011)
  • Author(s): T. Koike et al.
  • Journal Title: Int. J. Mod. Phys. Volume: E 20 Issue: 02 Pages: 520-525
  • DOI: 10.1142/s0218301311017946
  • Peer Reviewed
• [Presentation] ATLAS実験アップグレード用ピクセル検出器の性能評価 (2014)
  • Author(s): 荒井泰貴
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学湘南キャンパス
• [Presentation] 準弾性AO(p,2p)反応による窒素同位体の陽子-空孔状態の核分光 (2014)
  • Author(s): 川瀬頌一郎
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学湘南キャンパス
• [Presentation] 陽子3He散乱実験における偏極分解能測定のための偏極ヘリウム3標的の開発 (2014)
  • Author(s): 塩川裕太
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学湘南キャンパス
• [Presentation] RIBF-SLOWRI 共鳴イオン化レーザーイオン源(PALIS)の開発とレーザー核分光への応用 (2013)
  • Author(s): 園田哲
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 高知大学
• [Presentation] 偏極陽子標的を用いた陽子ノックアウト反応による14, 22, 24O のスピン軌道分離の研究II (2013)
  • Author(s): 川瀬頌一郎
  • Organizer: 第68回日本物理学会年次大会
  • Place of Presentation: 広島大学
• [Presentation] ペンタセン分子の光励起三重項状態の時間発展とその温度依存性 (2013)
  • Author(s): 河原朋美
  • Organizer: 第68回日本物理学会年次大会
  • Place of Presentation: 広島大学
• [Presentation] RIBF-SLOWRI共鳴イオン化レーザーイオン源(PALIS)の開発とレーザー核分光への応用 (2013)
  • Author(s): 園田哲
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 高知大学朝倉キャンパス
• [Presentation] 偏極陽子標的を用いた陽子ノックアウト反応による14,22,24Oのスピン軌道分離の研究II (2013)
  • Author(s): 川瀬頌一郎
  • Organizer: 第68回日本物理学会年次大会
  • Place of Presentation: 広島大学東広島キャンパス
• [Presentation] ペンタセン分子の光励起三重項状態の時間発展とその温度依存性 (2013)
  • Author(s): 河原朋美
  • Organizer: 第68回日本物理学会年次大会
  • Place of Presentation: 広島大学東広島キャンパス
• [Presentation] Recent activities with RF-IGISOL at CYRIC (2012)
  • Author(s): K. Shimada
  • Organizer: EMIS2012(XVI International conference on electromagnetic isotope separators and techniques related to their applications)
  • Place of Presentation: 松江
• [Presentation] Development of a gas cell-based laser ion source for RIKEN PALIS (2012)
  • Author(s): T. Sonoda
  • Organizer: EMIS2012(XVI International conference on electromagnetic isotope separators and techniques related to their applications)
  • Place of Presentation: 松江
• [Presentation] 偏極陽子標的を用いた陽子ノックアウト反応による14,22,24Oのスピン軌道分離の研究 (2012)
  • Author(s): 川瀬頌一郎
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 京都産業大学
• [Presentation] Expected breakthrough in future (2011)
  • Author(s): 涌井崇志
  • Organizer: RIBF-ULIC-miniWS Future direction of triplet polarization studies
  • Place of Presentation: 和光市