Behaviour of radioactive ions and atoms at the surface of superfluid helium

• Project/Area Number: 17540269
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka University (2007); Osaka Gakuin University (2005-2006)
• Principal Investigator: TAKAHASHI Noriaki Osaka University, Research Center for Nuclear Physics, collaborativer Researcher (10028152)
• Co-Investigator(Kenkyū-buntansha): SHIMODA Tadasdhi Osaka University, Graduate School of Science, Professor (70135656)
• Project Period (FY): 2005 – 2007
• Project Status: Completed (Fiscal Year 2007)
• Budget Amount: ¥3,410,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥210,000); Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2005: ¥1,500,000 (Direct Cost: ¥1,500,000)
• Keywords: Superfluid Helium / Impurity ion / Snowball / Transport Phenomena / Surface / Potential Barrier / Extraction / 放射線検出法 / 第2音波法 / 放射線核ビーム / 放射性核ビーム

Research Abstract

In this project behaviour of radioactive ions and atoms in superfluid helium and on its surface was investigated. The aim is to explore nuclear physics and nuclear astrophysics in new phases, such as availability of wide variety of radioactive nuclei. As a stopper of variety of heavy ion reaction products here is proposed use of superfluid helium. There positive ions form snowballs and the controllability of nuclear spin in snowballs has been known since some time. The steps here are to investigate the extraction of positive ions from the surface of superfluid helium, as ultracold (zero energy) radioactive beams are to be anticipated.
Attained here are understandings of separation and transport of radioactive ions in superfluid helium and the measurements of surface potential barrier.
Pulsed second sound in superfluid helium was effective to increase the probability of ion extraction from the surface, which was considered almost impossible otherwise. Excessive second sound pulses heat up the superfluid helium and degrade the transport of ions in the form of snowballs. The existence time for positive ions at the surface was estimated as the same order with the lifetime of 219Rn used as positive ions.
Reseach was carried out at Osaka, Groningen, Netherlands, Darmstadt, Germany and Jyvaskyla, Finland.

Research Products

• [Journal Article] Cryogenic Helium as Stopping Media fpr High-Energy Ions, (2008)
  • Author(s): S. Purushothaman
  • Journal Title: (印刷中)
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] Cryogenic Helium as Stopping Media fpr High-Energy Ions (2008)
  • Author(s): S., Purushothaman, P., Dendooven, I., Moore, H., Penttila, J., Ronkainen, A., Saastamoinen, J., Aysto, K., Perajavi, N., Takahashi, K., Gloos
  • Journal Title: Nuclear Instruments and Methods in Physics Research (in press)
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Electron Capture Cross-sections between 3He^+ Ion and Rubidium Vapor in the Energy Range 1.0-19 keV (2006)
  • Author(s): M. Tanaka
  • Journal Title: A568
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] A New Measurement of the Astrophysical 8Li(a,n)^<11>B Reaction, (2006)
  • Author(s): H.Ishikawa
  • Journal Title: B640
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] Radioactive Ions and Atoms in Superfluid Helium (2006)
  • Author(s): P. Dendooven
  • Journal Title: AIP Conf. Ser. 831
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] Measurement of a Long Electronic Spin Relaxation Time of Cesium Atoms in Superfluid Helium, (2006)
  • Author(s): T. Furukawa
  • Journal Title: Physical Review Letters 96
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] Electron Capture Cross-sections between ^3He+ Ion and Rubidium Vapor in the Energy Range 1.0-19 keV (2006)
  • Author(s): M., Tanaka, Y., Takahashi, T., Shimoda, T., Furukawa, M., Yosoi, K., Takahis, N., Shimakura, S., Yasui
  • Journal Title: Nuclear Instruments and Methods in Physics Research A 568 Pages: 543-547
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] A New Measurement of the Astrophysical ^8Li(a,n)^<11> B Reaction (2006)
  • Author(s): H., Ishiyama, T., Hashimoto, T., Ishikawa, Y.X., Watanabe, S.K., Das, H., Miyatake, Y., Mizoi, T., Fukuda, It-H., Tanaka, Y., Fuchi, N., Yoshikawa, S.C., Jeong, T., Nomura, I., Katayama, S., Mitsuoka, K., Nishio, M., Matsuda, P.K., Saha, S., Ichikawa, H., Ikezoe, T., Furukawa, H., Izumi, T., Shimoda, K., Nakai
  • Journal Title: Physics Letters B 640 Pages: 82-85
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Radioactive Ions and Atoms in Superfluid Helium (2006)
  • Author(s): P., Dendooven, I., Moore, H., Penttila, J., Ronkainen, A., Saastamoinen, J., Aysto, K., Perajavi, N., Takahashi, K., Gloos
  • Journal Title: AIP Conf. Ser 831 Pages: 439-442
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Measurement of a Long Electronic Spin Relaxation Time of Cesium Atoms in Superfluid Helium (2006)
  • Author(s): T., Furukawa, Y., Matsuo, A., Hatakeyama, Y., Fukuyama, T., Kobayashi, H., Izumi, T., Shimoda
  • Journal Title: Physical Review Letters 96, 095301-1-4
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Radioactive Ions and Atoms in Superfluid Helium (2006)
  • Author(s): P.Dendooven, N.Takahashi
  • Journal Title: AIP Conf. Ser 831 Pages: 439-439
• [Journal Article] A new measurement of the astrophysical ^8Li (α, n)^<11>B reaction (2006)
  • Author(s): H.Ishiyama, T.Shimoda
  • Journal Title: Phys. Lett. B 640 Pages: 82-82
• [Journal Article] Measurement of a Long Electronic Spin Relaxation Time of Cesium Atoms in Supeefluid Helium (2006)
  • Author(s): T.Furukawa, T.Shimoda
  • Journal Title: Phys. Rev. Lett. 96 Pages: 95301-1
• [Journal Article] Study of^<11>Be Structure through β-Delayed Decays from Polarized 11Li, (2005)
  • Author(s): Y. Hirayama
  • Journal Title: Physics Letters B611
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] Study of ^<11>Be Structure through 6-Delayed Decays from Polarized ^<11>Li (2005)
  • Author(s): Y., Hirayama, T., Shimoda, H., Izumi, A., Hatakeyama, K.R., Jackson, C.D.P., Levy, H., Miyatake, M., Yagi, H., Yano
  • Journal Title: Physics Letters B 611 Pages: 239-247
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Study of 11Be structure through beta-delayed decays from polarized 11Li (2005)
  • Author(s): Hirayama, et al.
  • Journal Title: Physics Letters B611 Pages: 239-247
• [Presentation] Cryogenic helium as stopping medium for high energy ions, (2007)
  • Author(s): S. Purushothaman
  • Organizer: EMIS 2007
  • Place of Presentation: Deauville, France
  • Year and Date: 2007-06-27
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Cryogenic helium as stopping medium for high energy ions (2007)
  • Author(s): S., Purushothaman, P., Dendooven, I., Moore, H., Penttila, J., Ronkainen, A., Saastamoinen, J., Aysto, K., Perajavi, N., Takahashi, K., Gloos
  • Organizer: EMIS 2007
  • Place of Presentation: Deauville, France
  • Year and Date: 2007-06-27
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Cryogenic helium as stopping medium for high-energy ions (2007)
  • Author(s): Purushothaman, Siva
  • Organizer: EMIS 2007
  • Place of Presentation: Deauville, France
  • Year and Date: 2007-06-27
• [Presentation] Superfluid helium and cryogenic noble gases as stopping media forion catchers (2006)
  • Author(s): P. Dendooven
  • Organizer: ALMAS-1
  • Place of Presentation: Darmstadt, Germany
  • Year and Date: 2006-10-19
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Superfluid helium and cryogenic noble gases as stopping media for ion catchers (2006)
  • Author(s): P., Dendooven, S., Purusgothaman, A., Saastamoinen, T., Sonoda, I., moore, J., Aysto, H., Pentti, P., Ronkanen, K., Gloos, N., Takahashi, Ch., Scheidenberger, W. Plass
  • Organizer: ALMAS-1
  • Place of Presentation: Darmstadt, Germany
  • Year and Date: 2006-10-19
  • Description: 「研究成果報告書概要(欧文)」より