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排序方式: 共有131条查询结果,搜索用时 281 毫秒
21.
Asahi K. Ogawa H. Ueno H. Kobayashi Y. Sato W. Yoshimi A. Watanabe H. Kameda D. Miyoshi H. Sakai K. Imai N. Yoneda K. Watanabe Y. X. Fukuda N. Aoi N. Yoshida A. Kubo T. Ishihara M. 《Hyperfine Interactions》2001,136(3-8):183-187
Magnetic dipole and electric quadrupole moments of nuclei in the light-mass neutron-rich region have been studied by taking
advantage of spin-polarized radioactive nuclear beams that have been obtained from the projectile fragmentation reaction.
Analyses of the results reveal a few interesting phenomena characteristic of nuclear structures in this region. In particular,
we report in some detail the latest result on the magnetic moment of the 17C ground state. The distinctly small value of the g-factor obtained, |g(17C)|=0.5054±0.0025, clearly excludes a I
π=1/2+ candidate for the spin-parity assignment of this marginally bound nucleus, providing a reasonable account of the non-halo
nature reported in recent breakup reaction experiments. Finally, future plans at the upcoming radioactive beam facility presently
under construction at RIKEN are briefly mentioned.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
22.
H. Iwasaki T. Motobayashi H. Sakurai K. Yoneda T. Gomi N. Aoi N. Fukuda Zs. Fülp U. Futakami Z. Gacsi Y. Higurashi N. Imai N. Iwasa T. Kubo M. Kunibu M. Kurokawa Z. Liu T. Minemura A. Saito M. Serata S. Shimoura S. Takeuchi Y.X. Watanabe K. Yamada Y. Yanagisawa M. Ishihara 《Physics letters. [Part B]》2005,620(3-4):118-124
The excitation of the neutron-rich nucleus 28Ne has been investigated via heavy-ion inelastic scattering in reversed kinematics. The value was determined to be , which is smaller than expected from the low excitation energy of the first state. A comparison with theoretical predictions suggests that the suppressed collectivity in 28Ne is characteristic of nuclei lying on the boundary of the ‘island of inversion’. 相似文献
23.
N. Aoi K. Yoneda H. Miyatake H. Ogawa Y. Yamamoto E. Ideguchi T. Kishida T. Nakamura M. Notani H. Sakurai T. Teranishi H. Wu S. S. Yamamoto Y. Watanabe A. Yoshida M. Ishihara 《Zeitschrift für Physik A Hadrons and Nuclei》1997,358(2):253-255
Experimental studies of β-decay measurements of the neutron drip line nuclei 11Li and 14Be are presented. β- decay schemes of these nuclei are determined by measuring β-rays, delayed neutrons and γ-rays in triple coincidence. The decay schemes of both 11Li and 14Be associated with single neutron emission are unambiguously determined. New levels in their daughter nuclei, 11Be and 14B, are found. In addition, the deduced level scheme of 14B indicates the lowering of 2s 1/2 single neutron orbital with respect to 1p 1/2 orbital in the N=9 isotones. Such behavior is known to exist in N=7. 相似文献
24.
Takeshi Sasami Yoko Odawara Akihiro Ohkubo Mitsuo Sekine Kohji Seio 《Tetrahedron letters》2007,48(30):5325-5329
2-N-Carbamoyldeoxyguanosine and its derivatives were synthesized and incorporated into ODNs. The Tm analyses revealed higher selective base recognition ability of 2-N-carbamoylguanine than that of guanine. The new guanine analog must be useful for the development of functional oligodeoxynucleotides capable of precise base recognition. 相似文献
25.
Aoi Takeda Hiroki Akasaka Shigeo Ohshio Ikumi Toda Masayuki Nakano Hidetoshi Saitoh 《Journal of Physics and Chemistry of Solids》2012,73(11):1331-1334
To understand why amorphous carbon (a-C:H) film shows antithrombogenicity, an adsorption ability of plasma proteins on a-C:H surface was investigated. Protein adsorption is the initial process of clot formation. The protein adsorption ability on a-C:H film surface was compared by the detection using the surface plasmon resonance (SPR) phenomenon to estimate the protein adsorption. The protein adsorption abilities of a fibrinogen (Fib) and a human γ-globulin (HGG) were estimated by the SPR method using a multilayer structure of a-C:H/Au/Cr/glass. Although the adsorption of HGG for a-C:H was saturated at 32 μM in HGG concentration, the adsorption of Fib was not saturated under the detection limit of this method. These results indicated that the adsorption ability to the a-C:H film surface of Fib was higher than HGG. 相似文献
26.
Nakamura T Vinodkumar AM Sugimoto T Aoi N Baba H Bazin D Fukuda N Gomi T Hasegawa H Imai N Ishihara M Kobayashi T Kondo Y Kubo T Miura M Motobayashi T Otsu H Saito A Sakurai H Shimoura S Watanabe K Watanabe YX Yakushiji T Yanagisawa Y Yoneda K 《Physical review letters》2006,96(25):252502
An exclusive measurement has been made of the Coulomb dissociation of the two-neutron halo nucleus 11Li at 70 MeV/nucleon at RIKEN. Strong low-energy (soft) E1 excitation is observed, peaked at about Ex = 0.6 MeV with B(E1) = 1.42(18) e2fm2 for Erel < or = 3 MeV, which was largely missed in previous measurements. This excitation represents the strongest E1 transition ever observed at such low excitation energies. The spectrum is reproduced well by a three-body model with a strong two-neutron correlation, which is further supported by the E1 non-energy-weighted cluster sum rule. 相似文献
27.
Imae T Hirota T Funayama K Aoi K Okada M 《Journal of colloid and interface science》2003,263(1):306-311
Binding of poly(amido amine) dendrimer to sodium hyaluronate (NaHA) in aqueous 0.25 M NaCl solution has been investigated by static light scattering. It was observed that the apparent weight-average molecular weight and the radius of gyration increase with the ratio of NH(2) terminal groups in the dendrimer to the carboxylate groups in the NaHA, [NH(2)]/[COO(-)]. Up to [NH(2)]/[COO(-)]=31, the observed variation of molecular weight was reproduced by the "average binding" model, where an average number of dendrimers binds to each NaHA chain. Based on the "critical binding" model, the maximum number, n(max), of dendrimers which can bind to a NaHA chain was calculated to be n(max)=300 for a solution of [NH(2)]/[COO(-)]=56. The obtained value corresponds to the binding of one dendrimer per 1.5 repeating units on a NaHA chain. It is suggested from the observed radius of gyration that, while the dendrimer-NaHA complexes of [NH(2)]/[COO(-)] up to 5 maintain a wormlike character similar to NaHA without bound dendrimers, those of [NH(2)]/[COO(-)] above 10 behave like rigid rods. It is concluded that the hydrogen-bonding interaction, besides the electrostatic interaction, should play an important role in the formation of the NaHA-dendrimer complexes. 相似文献
28.
Keigo Aoi Tadashi Hatanaka Kaname Tsutsumiuchi Masahiko Okada Toyoko Imae 《Macromolecular rapid communications》1999,20(7):378-382
A novel ABn-type dendrimer/linear polymer block copolymer, i.e., poly(trimethyleneimine) dendrimer-block-(polysarcosine)64 ( 1 ), was synthesized by ring-opening polymerization of sarcosine N-carboxyanhydride initiated with the 64-NH2-terminal poly(trimethyleneimine) dendrimer as a macroinitiator. 1 has narrow molecular weight distributions (Mw/Mn = 1.01–1.03, by size exclusion chromatography) and controlled polysarcosine chain lengths (by varying the monomer/dendrimer feed molar ratios). Small-angle neutron scattering (SANS) data obtained in D2O solution of 1 (DP's of polysarcosine = 2.0 and 24) fitted well with a Guinier plot of a spherical particle, and gave diameters of 44 and 100 Å, respectively. 相似文献
29.
Keigo Aoi Kaname Tsutsumiuchi Ayami Yamamoto Masahiko Okada 《Macromolecular rapid communications》1998,19(1):5-9
Sugar-substituted α-amino acid N-carboxyanhydrides (glycoNCAs), i.e., O-(tetra-O-acetyl-β-D -glucopyranosyl)-L -serine NCA (2a ) and O-(2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-β-D -glucopyranosyl)-L -serine NCA (2b ), were successfully used for the introduction of a mono(glycopeptide) unit into each terminal primary amino group of a dendrimer. Well-defined dendrimer-based artificial glycoconjugates, O-(β-D -glucopyranosyl)-L -serine-persubstituted poly(amido amine) (PAMAM) dendrimer (3a ) and O-(2-acetamido-2-deoxy-β-D -glucopyranosyl)-L -serine-persubstituted PAMAM dendrimer (3b ), were synthesized by polymer reaction of PAMAM dendrimer with 2a and 2b , respectively, followed by deacetylation with hydrazine monohydrate. 相似文献
30.