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Journal Articles

Precise determination of $$^{12}_{Lambda}$$C level structure by $$gamma$$-ray spectroscopy

Hosomi, Kenji; Ma, Y.*; Ajimura, Shuhei*; Aoki, Kanae*; Dairaku, Seishi*; Fu, Y.*; Fujioka, Hiroyuki*; Futatsukawa, Kenta*; Imoto, Wataru*; Kakiguchi, Yutaka*; et al.

Progress of Theoretical and Experimental Physics (Internet), 2015(8), p.081D01_1 - 081D01_8, 2015/08

https://doi.org/10.1093/ptep/ptv113
 Times Cited Count：14 Percentile：66.39(Physics, Multidisciplinary)

Level structure of the $$^{12}_{Lambda}$$C hypernucleus was precisely determined by means of $$gamma$$-ray spectroscopy. We identified four $$gamma$$-ray transitions via the $$^{12}$$C$$(pi^{+},K^{+}gamma)$$ reaction using a germanium detector array, Hyperball2. The spacing of the ground-state doublet $$(2^{-}, 1^{-}_{1})$$ was measured to be $$161.5pm0.3$$(stat)$$pm0.3$$ (syst)keV from the direct $$M1$$ transition. Excitation energies of the $$1^{-}_{2}$$ and $$1^{-}_{3}$$ states were measured to be $$2832pm3pm4$$, keV and $$6050pm8pm7$$, keV, respectively. The obtained level energies provide definitive references for the reaction spectroscopy of $$Lambda$$ hypernuclei.

Oral presentation

Crystal structure and quantitative analysis of mica in machinable glass ceramics using neutron diffraction

Toyoda, Takeshi*; Sasaki, Naoya*; Kitagawa, Katsuichi*; Nakamura, Shizuo*; Sato, Akishige*; Terao, Koichi*; Igawa, Naoki; Ishii, Yoshinobu

no journal, , 

no abstracts in English

Oral presentation

FACE-N project; Free-Air CO$$_{2}$$ Enrichment study for paddy rice with a focus on its effect on nitrogen cycle

Hayashi, Kentaro*; Hasegawa, Toshihiro*; Tokida, Takeshi*; Ono, Keisuke*; Matsuda, Kazuhide*; Toyoda, Sakae*; Yano, Midori*; Sudo, Shigeto*; Wagai, Rota*; Matsushima, Miwa*; et al.

no journal, , 

National Institute for Agro-Environmental Sciences, Japan, established new Free-Air CO$$_{2}$$ Enrichment (FACE) facilities for paddy rice in central Japan (Tsukuba FACE) in April, 2010. Early FACE studies were originally designed to investigate changes in plant growth, crop yield, and carbon cycle under elevated CO$$_{2}$$ and temperature. In addition to these research agenda, a three-year project at Tsukuba FACE that assesses the changes in nitrogen cycle due to climate manipulation (FACE-N) started in April, 2010. The FACE-N project has the following themes: (1) atmosphere-paddy exchange of nitrogen; (2) nitrogen-related processes in a soil-rice system; and (3) development of the sophisticated nitrogen cycling model at a plot scale and of the regional nitrogen assessment system using remote-sensing technique and geographic information system (GIS).

Oral presentation

Site preference and magnetic structural study on BaTiMnFe$$_{10}$$O$$_{19}$$ by neutron and X-ray diffraction

Takayasu, Shunichi*; Yoshizaki, Jumpei*; Okube, Maki*; Toyoda, Takeshi*; Igawa, Naoki; Sasaki, Satoshi*

no journal, , 

Hexagonal barium ferrites have been traditionally used as permanent magnets and microwave devices because of their high coercivity and large uniaxial anisotropy. It is recognized that the magnetic anisotropy can be optimized by Fe$$^{3+}$$ ion for several magnetic and non-magnetic ions, which makes M-type ferrites suitable for microwave absorber in 1 - 75 GHz range. In this study to use neutron and X-ray powder diffraction, site preference and magnetic structure of iron sites on BaTiCoFe$$_{10}$$O$$_{19}$$ are examined.

Oral presentation

Site preference and magnetic structure of M-type BaTiMnFe$$_{10}$$O$$_{19}$$ ferrite determined by X-ray and neutron diffraction methods

Takayasu, Shunichi*; Yoshizaki, Jumpei*; Okube, Maki*; Toyoda, Takeshi*; Igawa, Naoki; Sasaki, Satoshi*

no journal, , 

Site preferences of Ti and Mn and the magnetic structure of M-type BaTiMnFe$$_{10}$$O$$_{19}$$ ferrite were analyzed using the X rays and neutron powder diffraction method. The intensity difference on the magnetic scattering was clearly observed below and above the ${it T}$c, showing the ferrimagnetic spin arrangement along with the ${it c}$ axis. Site-occupancy refinements give the results that Ti ions occupy the 4${it f}$1 (24%), 2${it a}$ (15%) and 2${it b}$ (15%) sites, while Mn ions prefer to 4${it f}$2 (24%) and 12${it k}$ (24%). Magnetic moments were obtained from the Rietveld refinements, which are 3.56, 3.37, -3.86, -3.72 and 3.68 $$mu$$$$_{B}$$ at ${it T}$ = 8 K for 2${it a}$, 2${it b}$, 4${it f}$1, 4${it f}$2 and 12${it k}$ sites, respectively.

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