Np-237 Mossbauer Spectroscopy on the exotic quantum states of Neptuniumcompounds.

2012 Fiscal Year Final Research Report

• Project/Area Number: 22540361
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: HOMMA Yoshiya 東北大学, 金属材料研究所, 助教 (00260448)
• Co-Investigator(Kenkyū-buntansha): HAGA Yoshinori 独立法人日本原子力研究開発機構, 先端 基礎研究センター, 研究主幹 (90354901)
• Co-Investigator(Renkei-kenkyūsha): NAKADA Masami 独立法人日本原子力研究開発機構, 原子 力基礎工学研究部門, 研究副主幹 (60370441) ; OSAKA Masahiko 独立法人日本原子力研究開発機構, 大洗 工学センター, 研究主幹 (10421471)
• Project Period (FY): 2010 – 2012
• Keywords: Mossbauer spectroscopy / actinide / 5f electrons / neptunium / ^<237>Np / ^<241>Am

Research Abstract

We demonstrate that the ^<241>Am-Pd alloy produced by the coupling reduction process of AmO_2 and Pd powder brings a high resolution ^<237>Np Mossbauer spectrum. We built up the ^<237>Np Mossbauer spectroscopy system for applying solid state physics of the transuranium compounds and the nuclear fuels.

Research Products

• [Journal Article] ^<237>Np nuclear relaxation rate in heavy fermionsuperconductor NpPd_5Al_2 (2011)
  • Author(s): H. Chudo, Y. Tokunaga, S. Kambe, H. Sakai, Y. Haga, TD. Matsuda, Y. Onuki, H. Yasuoka, D. Aoki, Y. Homma, RE. Walstedt
  • Journal Title: PHYSICAL REVIEW B Volume: 84(9) Pages: 094402
  • DOI: DOI:10.1103/PhysRevB.84.094402
• [Journal Article] NMR Evidence for the 8.5K Phase Transition inAmericium Dioxide (2010)
  • Author(s): Y. Tokunaga, T. Nishi, S. Kambe, M. Nakada, A. Itoh, Y. Homma, H. Sakai, and H. Chudo
  • Journal Title: J. Phys. Soc. Jpn Volume: 79 Pages: 053705-1-4
  • DOI: DOI:10.1143/JPSJ.79.053705
• [Journal Article] ^<17>O NMR study in (Pu_<0.9>1Am^<0.09>)O_2 (2010)
  • Author(s): Y. Tokunaga, M. Osaka, S. Kambe, S. Miwa, H. Sakai, H. Chudo, Y. Homma, and Y. Shiokawa
  • Journal Title: J. Nuclear Mater Volume: 396 Pages: 107-111
  • DOI: DOI:10.1016/j.jnucmat.2009.10.062
• [Journal Article] La substitution effect and hyperfine-enhanced^<141>Prnuclear spin dynamics in PrPb_3: ^<139>La NMR study inPr_<0.97>La_<0.03>Pb_3 (2010)
  • Author(s): Y. Tokunaga, H. Sakai, H. Chudo, S. Kambe, H. Yasuoka, H.S. Suzuki, R.E. Walstedt, Y. Homma, D. Aoki, and Y. Shiokawa
  • Journal Title: Phys. Rev. B Volume: 82 Pages: 104401-1-6
  • DOI: DOI:10.1103/PhysRevB.82.10440
• [Journal Article] Heavy fermion state and quantum criticality (2010)
  • Author(s): Y. Onuki, R. Settai, F. Honda, N.D. Dung, T. Ishikura, T. Takeuchi, T.D. Matsuda, N. Tateiwa, A. Nakamura, E. Yamamoto, Y. Haga, D. Aoki, Y.Homma, H. Harima, and H. Yamagami
  • Journal Title: Physica B-Condensed Matter Volume: 405 Pages: 2194-2199
  • DOI: DOI:doi.org/10.1016/j.physb.2010.02.00
• [Journal Article] Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor NpPd_5Al_2 (2010)
  • Author(s): H. Chudo, H. Sakai, Y. Tokunaga, S. Kambe, D. Aoki, Y. Homma, Y. Haga, T.D. Matsuda, Y. .nuki, and H. Yasuoka
  • Journal Title: J. Phys. Soc. Jpn Volume: 79 Pages: 053704-1-4
  • DOI: DOI:10.1143/JPSJ.79.053704
• [Presentation] EuX_4(X=Al,Ga)のメスバウアー分光 (2013)
  • Author(s): 本間佳哉,仲村愛,広瀬雄介,辺土正人,仲間隆,李徳新,本多史憲,大貫惇睦,青木大
  • Organizer: 日本物理学会春の総会
  • Place of Presentation: 広島大学
  • Year and Date: 2013-03-20
• [Presentation] EuGa_4のメスバウアー分光 (2012)
  • Author(s): 本間佳哉,仲村愛,広瀬雄介,大貫惇睦,青木大
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2012-09-20
• [Presentation] EuFe_2As_2単結晶の^<151>Euメスバウアー分光 (2012)
  • Author(s): 本間佳哉,池田修悟,小林寿夫,那須三郎,芳賀芳範,四竈樹男
  • Organizer: 日本物理学会春の総会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-24
• [Presentation] ^<151>Eu MOSSBAUER SPECTROSCOPY OF EuFe_2As_2SINGLE CRYSTAL (2011)
  • Author(s): Y.Homma, S.Ikeda, H.Kobayashi, S.Nasu, Y.Haga, and T.Shikama^1
  • Organizer: ICAME 2011
  • Place of Presentation: Kobe
  • Year and Date: 2011-09-28
• [Presentation] メスバウアー分光によるNpFeGa_5の磁気構造解析 (2011)
  • Author(s): 本間佳哉,青木大,中田正美,芳賀芳範,神戸振作,目時直人,那須三郎,中村彰夫,大貫睦惇
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-21
• [Presentation] EuFe_4As_<12>スクッテルダイト化合物のメスバウアー分光 (2010)
  • Author(s): 本間佳哉,四竈樹男,関根ちひろ,芳賀芳範,那須三郎
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-25