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Journal Articles

Fine structure in the $$alpha$$ decay of $$^{223}$$U

Sun, M. D.*; Liu, Z.*; Huang, T. H.*; Zhang, W. Q.*; Andreyev, A. N.; Ding, B.*; Wang, J. G.*; Liu, X. Y.*; Lu, H. Y.*; Hou, D. S.*; et al.

Physics Letters B, 800, p.135096_1 - 135096_5, 2020/01

 Times Cited Count:6 Percentile:89.19(Astronomy & Astrophysics)

Journal Articles

Characterization of F$$^{+}$$-irradiated graphite surfaces using photon-stimulated desorption spectroscopy

Sekiguchi, Tetsuhiro; Baba, Yuji; Shimoyama, Iwao; Nath, K. G.

Surface and Interface Analysis, 38(4), p.352 - 356, 2006/04

 Times Cited Count:3 Percentile:8.09(Chemistry, Physical)

We investigated the orientation nature at the top-most layers of F$$^{+}$$-irradiated graphite using polarization dependent near-edge X-ray absorption fine structure (NEXAFS) spectroscopy which incorporates partial electron yield (PEY) detection and photon-stimulated ion desorption (PSID) techniques. The fluorine K-edge NEXAFS spectra conducted in PEY mode show no significant dependence on polarization angles. In contrast, NEXAFS spectra recorded in F$$^{+}$$ ion yield mode show enhanced yields at a feature of $$sim$$689.4 eV assigned as a $$sigma$$*(C-F) state relevant to =C-F sites, which depend on polarization angles. The C-F bonds prefer relatively tilting down the surface at the top-most layer, while the C-F bonds are randomly directed at deeper regions. We conclude that the difference in the orientation structures between the top surface and bulk is reflected in the NEXAFS recorded in the two different detection modes. It was also found that H$$^{+}$$- and F$$^{2+}$$- PSID NEXAFS spectra are helpful in understanding desorption mechanism, thus in analysing NEXAFS data.

Journal Articles

Mechanism of state-specific enhancement in photon-stimulated desorption as studied using a polarization-dependent technique

Sekiguchi, Tetsuhiro; Baba, Yuji; Shimoyama, Iwao; Wu, G.*; Kitajima, Yoshinori*

Surface Science, 593(1-3), p.310 - 317, 2005/11

 Times Cited Count:2 Percentile:12.3(Chemistry, Physical)

Using a newly developed rotatable time-of-flight mass spectrometer(R-TOF-MS) and polarized synchrotron radiation, orientation effect on fragmentation and desorption pathways occurring at the top-most layers of molecular solids have been investigated. Reported will be polarization-angle dependencies of TOF mass spectra, high-resolution electron- and ion-NEXAFS in condensed chlorobenzene.

Journal Articles

Direct and indirect processes in photon-stimulated ion desorption from condensed formamide

Ikeura, Hiromi*; Sekiguchi, Tetsuhiro; Baba, Yuji; Imamura, Motoyasu*; Matsubayashi, Nobuyuki*; Shimada, Hiromichi*

Surface Science, 593(1-3), p.303 - 309, 2005/11

 Times Cited Count:5 Percentile:27.34(Chemistry, Physical)

no abstracts in English

Journal Articles

Substitution effect on orientation of organosilicon compounds (CH$$_{3}$$)$$_{3}$$SiX (X = F, Cl, Br, I, NCO) as studied using NEXAFS spectroscopy

Sekiguchi, Tetsuhiro; Baba, Yuji; Shimoyama, Iwao; Nath, K. G.*; Uddin, M. N.*

Journal of Physics; Condensed Matter, 17(36), p.5453 - 5466, 2005/09

 Times Cited Count:1 Percentile:6.58(Physics, Condensed Matter)

The orientation nature of multilayer organosilicon compounds has been investigated by measuring the dependence of the Si K-shell near-edge X-ray absorption fine structures (NEXAFS) on the polarization angle. Two approaches helped to elucidate the orientation mechanism: the substitution effect and the deposition-rate dependence. The orientation angles of Si-X bond axes were obtained for trimethylsilyl halides, (CH$$_{3}$$)$$_{3}$$SiX (X =F Cl Br I NCO, condensed on Cu(111) at a low (82 K) temperature: the angles are 60, 73, 61, 55, and 55 degrees with respect to the surface normal, for X =F, Cl, Br, I, and NCO, respectively. Chloride (X =Cl) produces the most parallel tilt angle. The specific orientation nature of chloride is attributed to its strong dipole moment as well as the regular tetrahedron shape of the molecule. The molecular volumes calculated verify this view. Furthermore, deposition rates are found to greatly influence the growth manner: namely, high deposition rates led to a slightly perpendicular orientation of Si-X bond axis.

Journal Articles

Synchrotron radiation photoabsorption and photoemission spectroscopy for thermal-induced reoriented Si polymer

Nath, K. G.; Shimoyama, Iwao; Sekiguchi, Tetsuhiro; Baba, Yuji

Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.323 - 326, 2005/06

 Times Cited Count:5 Percentile:28.59(Spectroscopy)

The effect of laser annealing on electronic atructures and molecular orientation for poly(dimethylsilane), {PDMS, [Si(CH$$_{3}$$)$$_{2}$$]$$_{n}$$} has been studied by synchrotron radiation photoemission and photoabsorption spectroscopy. Prior to annealing, PDMS powder was mounted on the basal plane of highly oriented pyrolytic graphite. Both Si 1s X-ray photoemission spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy at Si 1s edge show that electronic structures have been modified due to annealing. Furthermore, the angle-dependent NEXAFS spectra clearly indicate that the annealed products maintain a specific orientation. Interestingly, no such kind of orientation is present in as-received PDMS powder as no angle-dependency is observed before annealing.

Journal Articles

Fragment-ion desorption from sulfur-containing amino acids by localized core-level excitation

Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao

Surface Review and Letters, 9(1), p.77 - 83, 2002/02

 Times Cited Count:4 Percentile:26.99(Chemistry, Physical)

no abstracts in English

Journal Articles

Spectroscopy for high atomic energy levels using external cavity laser diode

Oba, Masaki; Wakaida, Ikuo; Miyabe, Masabumi

Japanese Journal of Applied Physics, Part 1, 40(1), p.357 - 358, 2001/01

 Times Cited Count:1 Percentile:6.36(Physics, Applied)

no abstracts in English

Journal Articles

Symmetries of compound systems revealed in the superfine structure of neutron resonance levels

Ideno, K.

Proc. of Int. Conf. on Neutrons in Research and Industry, 2867, p.398 - 403, 1996/06

no abstracts in English

Journal Articles

Recurrence of the compound nucleus in neutron resonance reactions

Okubo, Makio

Physical Review C, 53(3), p.1325 - 1335, 1996/03

 Times Cited Count:6 Percentile:38.71(Physics, Nuclear)

no abstracts in English

Journal Articles

High-resolution neutron powder diffraction study of Dy$$_{2}$$Fe$$_{9}$$Al$$_{8}$$ at 65K

S.Ridwan*; H.Mujamilah*; M.Gunawan*; P.Marsongkohadi*; Q.W.Yan*; P.L.Zhang*; X.D.Sun*; Z.H.Cheng*; Minakawa, Nobuaki; *

Journal of the Physical Society of Japan, 65(2), p.348 - 350, 1996/02

 Times Cited Count:1 Percentile:36.42(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Intensity ratio of lyman-$$alpha$$ fine-structure components of Ti XXII in the JT-60 tokamak plasma

Kubo, Hirotaka; Sakasai, Akira; Koide, Yoshihiko; Sugie, Tatsuo

Physical Review A, 46(12), p.7877 - 7881, 1992/12

 Times Cited Count:10 Percentile:54.89(Optics)

no abstracts in English

Journal Articles

Effect of hyperfine structure on multiple photo-ionization of atom

Akaoka, Katsuaki; Oba, Masaki; Wakaida, Ikuo; Miyabe, Masabumi; Arisawa, Takashi

Laser Advanced Materials Processing,Vol. 2, p.1233 - 1237, 1992/06

no abstracts in English

Journal Articles

Oxygen K-edge fine structure of La$$_{2-x}$$M$$_{x}$$CuO$$_{4-y}$$(M=Sr,Ba and Ca) studied by electron energy loss spectroscopy

*; *; *; *; Hojo, Kiichi; Furuno, Shigemi

Mater. Trans. JIM, 32(9), p.872 - 874, 1991/00

 Times Cited Count:1 Percentile:59.03(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Measurement of hyperfine structure of the 4f$$^{3}$$5d $$^{5}$$G-4f$$^{3}$$6p$$^{5}$$H in PrII by collinear laser-ion-beam spectroscopy

; Nakahara, Yoshinori; ; *; *; *

Journal of the Physical Society of Japan, 59(12), p.4208 - 4210, 1990/12

 Times Cited Count:11 Percentile:72.77(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

The structure of radical pairs in irradiated single crystal of n-eicosane as studied by electron spin resonance

Fujimura, Takashi;

Journal of Chemical Physics, 65(6), p.2333 - 2338, 1976/06

 Times Cited Count:4

no abstracts in English

Journal Articles

The Fine structure of graft polyethylene

Sasuga, Tsuneo; ; ; Kuriyama, Isamu

Reports on Progress in Polymer Physics in Japan, 15, p.515 - 518, 1972/00

no abstracts in English

Journal Articles

Recoil-free resonant absorption of 35.3-keV gamma rays of Te$$^{1}$$$$^{2}$$$$^{5}$$ and hyperfine structure of absorption spectrum

Journal of the Physical Society of Japan, 18(7), p.925 - 935, 1963/00

 Times Cited Count:20

no abstracts in English

Oral presentation

New additional experiments of $$alpha$$-decay spectroscopy for $$^{261}$$Rf

Asai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke*; Shibata, Michihiro*; Shima, Yosuke*

no journal, , 

We have performed $$alpha$$-$$gamma$$ coincidence and high-resolution $$alpha$$-fine structure spectroscopy for $$^{261}$$Rf, and have obtained new information on nuclear structure of $$^{261}$$Rf. We have confirmed the existence of two $$gamma$$ transitions following the $$alpha$$ decay, and have succeeded in determining the $$alpha$$-transition energy very accurately. On the basis of these experimental results, we have estimated the spin-parities and neutron single-particle configurations of the ground- and isomeric states of $$^{261}$$Rf, and have obtained information on the single-particle configurations and nuclear deformations for heavier superheavy nuclei.

Oral presentation

Alpha decay of $$^{261}$$Rf

Asai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke*; Shima, Yosuke*; Shibata, Michihiro*

no journal, , 

We have obtained new experimental data for nuclear structure of $$^{261}$$Rf through $$alpha$$-decay spectroscopy. We have reconfirmed existence of two $$gamma$$ transitions in the $$alpha$$ decay of $$^{261}$$Rf through $$alpha$$-$$gamma$$ coincidence measurement, and determined the $$alpha$$-transition energy very precisely through high-resolution $$alpha$$-fine structure measurement. On the basis of these experimental results, we have estimated spin-parities and neutron single-particle configurations of the ground- and isomeric states of $$^{261}$$Rf, and have obtained information on the single-particle configurations and nuclear deformations for heavier superheavy nuclei.

Oral presentation

Fine-structure $$alpha$$-decay spectroscopy of superheavy nuclei

Asai, Masato

no journal, , 

To investigate nuclear structure of superheavy nuclei experimentally, spectroscopic methods which can reveal level structure of ground- and excited states are the most effective. In particular, fine-structure $$alpha$$-decay spectroscopy is expected to be a very sensitive method because spectroscopic information can be obtained only through $$alpha$$-particle measurements. However, it is difficult to measure $$alpha$$ particles of superheavy nuclei with high energy resolution. Moreover, the observed $$alpha$$ energy spectra are significantly distorted by coincidence summing effects. I would like to demonstrate how we can overcome these difficulties, and how useful the fine-structure $$alpha$$-decay spectroscopy is to investigate nuclear structure of superheavy nuclei.

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